Search found 103 matches
- Sat Mar 17, 2018 9:58 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Thermodynamically stable vs Kinetically stable
- Replies: 1
- Views: 596
Thermodynamically stable vs Kinetically stable
Can someone please explain the difference between a reaction that is considered to be under kinetic control vs reaction considered to be under thermodynamic control? Like what control dominates at low temperature vs high temperatures? Which pathway has larger activation energy? etc..
- Fri Mar 16, 2018 11:13 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: 15.61 units
- Replies: 1
- Views: 310
15.61 units
What is the unit of activation energy?
For 15.61, I used R = 8.314 J/(K*mol), and got my activation energy as Joules, but the solutions manual converted R into KJ, thus making unit of activation energy KJ.
Does it matter which one I use?
For 15.61, I used R = 8.314 J/(K*mol), and got my activation energy as Joules, but the solutions manual converted R into KJ, thus making unit of activation energy KJ.
Does it matter which one I use?
- Thu Mar 15, 2018 8:52 am
- Forum: *Enzyme Kinetics
- Topic: Finals - enzymes?
- Replies: 1
- Views: 395
Finals - enzymes?
Must we know about. the rate of formation of product equation for enzymes (section 15.16 of book) and the michaelis constant thing?
- Tue Mar 13, 2018 9:25 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Coefficients in oxidation
- Replies: 2
- Views: 486
Re: Coefficients in oxidation
Cali Rauk1D wrote:Do coefficients matter when calculating oxidation numbers?
Just to add, subscripts matter when calculating oxidation numbers, but not coefficients
- Tue Mar 13, 2018 9:07 pm
- Forum: *Alkanes
- Topic: How to name the Alcohol
- Replies: 4
- Views: 1892
Re: How to name the Alcohol
Josh Moy 1H wrote:will naming be on the final?
yes, he said just the very basics
- Tue Mar 13, 2018 9:01 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Cp and Cv
- Replies: 2
- Views: 391
Re: Cp and Cv
How in depth are we expected to know the derivation of and utilization of the constants Cp and Cv. Are we supposed to understand the relationship in how Cp - Cv = R ? Are we supposed to understand how these constants change with degree of freedoms? Please elaborate how greatly in depth we are suppo...
- Tue Mar 13, 2018 8:47 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts
- Replies: 2
- Views: 354
Re: Catalysts
It's simply that homogeneous catalysts are in the same phase as the reactants, and heterogeneous catalysts are in different state from the reactants
- Sun Mar 11, 2018 10:05 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Internal Energy and heat
- Replies: 2
- Views: 383
Re: Internal Energy and heat
well since q=m*c*delta T, if delta T=0, q must also equal 0.
- Thu Mar 08, 2018 2:12 pm
- Forum: Second Order Reactions
- Topic: 15.35
- Replies: 3
- Views: 685
15.35
The half-life for the second-order reaction of a substance A is 50.5 s when [A]0 0.84 mol L 1. Calculate the time needed for the concentration of A to decrease to (a) one- sixteenth; (b) one-fourth; (c) one- fth of its original value. for part a, why can't we simply multiply the half life, so 50.5 s...
- Thu Mar 08, 2018 1:51 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Homework Problems
- Replies: 3
- Views: 622
Re: Homework Problems
Chris Pleman 3E wrote:Did Dr Lavelle mention the extent of the questions in the textbook that are necessary/will be covered by the Kinetics test? If so, which ones?
It's 1~39
- Wed Mar 07, 2018 8:16 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: unit of concentration [ENDORSED]
- Replies: 4
- Views: 763
unit of concentration [ENDORSED]
A lot of the hw questions give concentration in mmol/L instead of mol/L. Must we always convert fo mol/L or can we leave it as mmol/L ?
- Wed Mar 07, 2018 2:30 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3862631
Re: Post All Chemistry Jokes Here
Why does hamburger yield lower energy than steak?
Because it's in the ground state!
Because it's in the ground state!
- Wed Mar 07, 2018 8:19 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: 15.13
- Replies: 1
- Views: 367
Re: 15.13
Well no not necessarily.
If the only reactant was H2 and the reaction was second order, THEN rate would quadruple of H2 was doubled.
But for this particular question, rate would just double since order of H2 is 1. There are two reactants, H2 and I2, each with order of 1. Overall order is 2.
If the only reactant was H2 and the reaction was second order, THEN rate would quadruple of H2 was doubled.
But for this particular question, rate would just double since order of H2 is 1. There are two reactants, H2 and I2, each with order of 1. Overall order is 2.
- Wed Mar 07, 2018 8:17 am
- Forum: General Rate Laws
- Topic: Pg. 621 of textbook
- Replies: 1
- Views: 293
Re: Pg. 621 of textbook
Reaction would slow down as concentration of SO3 builds up because it is in the denominator. Plug some numbers in. Let's say the concentration of SO3 is 4, then the denominator is 2. If concentration increases to 9, then square root of 9 is 3. The point is, no matter what the exponent may be, if it'...
- Wed Mar 07, 2018 8:12 am
- Forum: Student Social/Study Group
- Topic: Test 3
- Replies: 3
- Views: 646
Test 3
So it says the test is on 15.1~6, but up to what problem number is the test on?
- Thu Feb 22, 2018 10:59 am
- Forum: Balancing Redox Reactions
- Topic: 14.15
- Replies: 2
- Views: 411
Re: 14.15
Alyssa Parry Disc 1H wrote:You just look in the back of the book in Appendix 2B and then find the best half reaction with Mno4- and the best half reaction for Fe2+
? For number 15 tho
- Thu Feb 22, 2018 9:50 am
- Forum: Balancing Redox Reactions
- Topic: 14.15
- Replies: 2
- Views: 411
14.15
I really just dont get how to write half reactions for this kind of reactions! :( can someone please please show me how to write half reactions for part a and b of this problem? Solutions manual do not make any sense to me..
- Thu Feb 22, 2018 7:24 am
- Forum: Balancing Redox Reactions
- Topic: 14.5 part a
- Replies: 1
- Views: 300
14.5 part a
How is the reduction half reaction O3(aq) -> O2(g)?
There is no change in oxidation number, so how is it considered a reduction?
There is no change in oxidation number, so how is it considered a reduction?
- Wed Feb 21, 2018 10:40 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: SHE
- Replies: 1
- Views: 284
SHE
Must the standard hydrogen electrode(she) always be on the left side of the cell diagram?
I was confused because hydrogen on can also be reduced to H2, right? So couldnt SHE also be on the right side of the cell diagram?
I was confused because hydrogen on can also be reduced to H2, right? So couldnt SHE also be on the right side of the cell diagram?
- Wed Feb 21, 2018 8:32 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Daniell Cell [ENDORSED]
- Replies: 1
- Views: 261
Daniell Cell [ENDORSED]
What is special about Daniell Cell that sets it apart from other galvanic cells? Are there any notable difference?
- Sun Feb 18, 2018 11:15 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3862631
Re: Post All Chemistry Jokes Here
Two chemists go into a restaurant.
The first one says "I think I'll have an H2O."
The second one says "I think I'll have an H2O too" - and he died.
The first one says "I think I'll have an H2O."
The second one says "I think I'll have an H2O too" - and he died.
- Sun Feb 18, 2018 10:42 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: galvanic vs electrolytic
- Replies: 4
- Views: 499
galvanic vs electrolytic
So what exactly is the difference between galvanic cell and electrolytic cell?
- Sun Feb 18, 2018 8:12 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isothermal, irreversible?
- Replies: 4
- Views: 820
Isothermal, irreversible?
Is delta U = 0 for isothermal, reversible processes only or does it also apply to irreversible ones?
- Sun Feb 11, 2018 3:19 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 9.15
- Replies: 1
- Views: 273
9.15
When do we use delta H instead of q as in delta S = delta H/T? (when the problem doesn't tell you that it's constant pressure)
Do you always use delta H instead of q during phase changes?
Do you always use delta H instead of q during phase changes?
- Sun Feb 11, 2018 7:30 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: formula for temperature change
- Replies: 1
- Views: 262
formula for temperature change
So I thought I had to use delta S = C * ln(T2/T1) when there is change in temperature.
But in the solutions manual for 9.13, it used delta S = nR*ln(T2/T1).
Can someone explain?
But in the solutions manual for 9.13, it used delta S = nR*ln(T2/T1).
Can someone explain?
- Sun Feb 11, 2018 7:24 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: 913
- Replies: 2
- Views: 392
913
the question says "During the test of an internal combustion engine, 3.00L of nitrogen gas at 18.5 degrees C was compressed suddenly (and irreversibly) to .500L by driving in a piston. In the process the temperature of the gas increased to 28.1 degrees C. Assume ideal behavior. What is the chan...
- Sat Feb 10, 2018 9:19 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Clausius Inequality [ENDORSED]
- Replies: 2
- Views: 517
Re: Clausius Inequality [ENDORSED]
Dr. Lavelle never mentioned the Clausius Inequality in class, so is it relevant for the midterm? If so, can someone explain how it relates to ΔS = q rev /T? ^ I agree that this probably won't be on the midterm since it was not covered in class/discussion. But, a process does maximum work if it take...
- Sat Feb 10, 2018 9:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Practice Midterm Winter 2018
- Replies: 10
- Views: 3149
Re: Practice Midterm Winter 2018
Is the link for practice midterm posted yet? Thank you!
- Sat Feb 10, 2018 9:06 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: delta U
- Replies: 2
- Views: 312
delta U
When solving a problem, when do we assume that delta U = 0, thus q=-w?
i.e. Is it only for reversible/isothermal path?
i.e. Is it only for reversible/isothermal path?
- Sun Feb 04, 2018 6:19 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: delta G
- Replies: 3
- Views: 419
delta G
I still don't get why delta G have is zero to find the minimum temperature. Could someone please explain?
- Fri Feb 02, 2018 9:37 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3862631
carbon tetrafluoride
"Look mom! a Carbon tetrafluoride!"
Report card:
Math: C
History: F
English: F
Chemistry: F
PE: F
Report card:
Math: C
History: F
English: F
Chemistry: F
PE: F
- Fri Feb 02, 2018 9:33 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3862631
Ar
I would tell another chemistry joke, but all of the good ones Argon...
- Thu Jan 25, 2018 9:18 am
- Forum: Phase Changes & Related Calculations
- Topic: Self Test 8.7A
- Replies: 2
- Views: 323
Re: Self Test 8.7A
At constant pressure, q = enthalpy. Thus, enthalpy only includes the "heat" part.
- Thu Jan 25, 2018 9:10 am
- Forum: Phase Changes & Related Calculations
- Topic: 8.87
- Replies: 2
- Views: 257
8.87
How much heat is required to convert a 42.30 g block of ice at -5.042 degrees C into water vapor at 150.35 degrees C?"
Why can't you use enthalpy of sublimation instead of adding enthalpy of fusion and of vaporization and heat change in liquid state?
Why can't you use enthalpy of sublimation instead of adding enthalpy of fusion and of vaporization and heat change in liquid state?
- Wed Jan 24, 2018 7:38 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: 8.49 [ENDORSED]
- Replies: 4
- Views: 617
Re: 8.49 [ENDORSED]
We will usually take chemical reactions as occurring in isothermal environments. This is the basis for standard molar enthalpies of formation and standard reaction enthalpies we have discussed and can be found tabulated in the back of the book. All these values are predicated on the fact that tempe...
- Wed Jan 24, 2018 9:11 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: 8.49 [ENDORSED]
- Replies: 4
- Views: 617
8.49 [ENDORSED]
Oxygen diflouride is a colorless, very poisonous gas that reacts rapidly with water vapor to produce O2, HF and heat: OF2 +H20 yields O2 +2HF and delta H is =- 318 kJ. I just don't get why T remains constant when calculating for -PdeltaV = -deltanRT. Also, why is T 298K and not other temperature? Th...
- Wed Jan 24, 2018 7:37 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: 8.31 [ENDORSED]
- Replies: 1
- Views: 213
8.31 [ENDORSED]
How would you solve this question? In the solutions, it says to use 5/2R.. what’s the value of R in this case?
- Wed Jan 24, 2018 7:33 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Section 8.10 [ENDORSED]
- Replies: 1
- Views: 255
Section 8.10 [ENDORSED]
Will stuffs like Cv,m= (3/2)R for monatomic ideal gas be on the test 1?? If so, will we need to memorize all the formulas or will it be given?
- Sat Jan 20, 2018 8:11 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Molar heat capacities of an ideal gas
- Replies: 2
- Views: 326
Molar heat capacities of an ideal gas
In section 8.9 of textbook, it states that Cp,m is larger than Cv,m since not all the heat supplied is used to raise the temperature at constant pressure. I didnt really understand why not all heat is used to raise temperature at comstant pressure. Can someone please explain?
- Sat Jan 20, 2018 2:32 pm
- Forum: Phase Changes & Related Calculations
- Topic: Unit of Pressure?
- Replies: 1
- Views: 132
Unit of Pressure?
how is the unit of pressure kg/(m*s^2)?
- Thu Jan 18, 2018 2:42 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Exercise 8.7
- Replies: 2
- Views: 282
Re: Exercise 8.7
it's just to keep track of sig figs. You do not need to write it in scientific notation :)
- Thu Jan 18, 2018 2:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: discussion session tests
- Replies: 1
- Views: 214
discussion session tests
Do ta's write their own discussion tests? or do all discussion sessions have the same test?
- Thu Jan 18, 2018 7:27 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.55
- Replies: 2
- Views: 256
8.55
In 8.55, thr answer sheet shows that delta H of 2Al + 3/2 O2 yeidls Al2O3 is -1676kJ. However, K dont understand how delta H of above equation is the same as delta H of 2Al + O2 yields Al2O3. Can someone explain?
- Sat Jan 13, 2018 3:36 pm
- Forum: Calculating Work of Expansion
- Topic: 8.9
- Replies: 2
- Views: 276
Re: 8.9
jillian1k wrote:1 L•atm is equal to 101.325 Joules.
There's an example on page 274-275 using this conversion.
Ohhh thank you!
- Sat Jan 13, 2018 3:24 pm
- Forum: Calculating Work of Expansion
- Topic: 8.9
- Replies: 2
- Views: 276
8.9
How do you convert 1.48 L•atm to Joules?
- Thu Jan 11, 2018 9:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: winter 2018 Discussion 2A 2D 2G Week 1 Topics
- Replies: 1
- Views: 207
Re: winter 2018 Discussion 2A 2D 2G Week 1 Topics
Thank you ziyang!
- Fri Dec 08, 2017 8:59 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 12.115
- Replies: 4
- Views: 467
Re: 12.115
Nitrous acid has a pKa of 3.16, so the pKb of its conjugate base must be 14-3.16 = 10.84 Acetic acid has a pKa of 4.75, so the pKb of its conjugate base must be 14-4.75 = 9.25 Since 10.84 > 9.25, and a large pKb corresponds to a weaker base, the conjugate base of nitrous acid is weaker. This can al...
- Thu Dec 07, 2017 12:03 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 12.115
- Replies: 4
- Views: 467
Re: 12.115
You can think of it in terms of Le Chatelier's Principle. When nitrous acid is dissolved, it produces a weaker conjugate base than that of acetic acid. This means that the conjugate base of acetic acid is better at eating all the hydronium ions (in the solutions manual, it says H+, not sure if they...
- Thu Dec 07, 2017 10:09 am
- Forum: Bronsted Acids & Bases
- Topic: Autoprotolysis
- Replies: 1
- Views: 232
Re: Autoprotolysis
Autoprotolysis is simply when a proton (H+ ion) is transferred between two identical molecules. One of them will be bronsted acid (giving H+) and one of them will be bronsted base (gaining H+). So for water, an H+ ion is being transferred from one water molecule, thus forming a hydronium ion (H3O+) ...
- Thu Dec 07, 2017 10:06 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.89
- Replies: 4
- Views: 624
Re: 11.89
Kyra LeRoy 1F wrote:100 kPa=1 bar, so to go from 1kPa you multiply each by 1/100 bar.
ohh so we always need to have pressure in terms of 'bar?'
- Thu Dec 07, 2017 10:03 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 12.115
- Replies: 4
- Views: 467
12.115
Question is: Acetic acid is used as a solvent for some reactions b/w acids and bases. a) nitrous acid and carbnonic acids are both weak acids in water. Will either of them act as a strong acid in acetic acid? explain your answer b) will ammonia act as a strong or weak base in acetic acid? Explain yo...
- Sun Dec 03, 2017 2:49 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.89
- Replies: 4
- Views: 624
11.89
Can someone please explain both parts of the question 11.89? I first dont get how you would write balanced equation when you don’t know the composition of A B and C, and also why is partial pressures all over 100 in the answer sheet for part b? For example, why is partial pressure for C not 10 and 1...
- Thu Nov 30, 2017 7:52 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Table 11.2
- Replies: 4
- Views: 543
Table 11.2
Why are thevalues of K and Kc different for some of the reactions in table 11.2? Shouldnt they all be the same?
- Thu Nov 30, 2017 7:50 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.13
- Replies: 3
- Views: 304
Re: 11.13
You can use the concentrations if you want to, but parts a and c have all reactants and products in the gas phase, so its easier to use pressure and not convert to concentration. For part b, since the components that are counted in Q are aqueous, it makes more sense and is faster to use concentrati...
- Thu Nov 30, 2017 7:16 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.13
- Replies: 3
- Views: 304
11.13
The question asks to write the reaction quotient for three chemical equations. I was wondering why, in the solutions manual, Q is found by using pressure for part a and c whereas concentration is used to find Q in part b. Does it matter at all? Can I just use concentration to find Q for all three eq...
- Thu Nov 30, 2017 6:25 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.11 part C
- Replies: 1
- Views: 215
11.11 part C
Could some one please explain why the ratio [O2]/[O3] would be different? The solutions manual says that "by solving for Kc in each case" I will be able to figure out why the ratio of concentration is different, but I do not understand the solution manual's explanation.
- Wed Nov 29, 2017 8:50 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Test 4
- Replies: 1
- Views: 278
Test 4
Up to what section of ch 11 are we being tested on?
- Tue Nov 28, 2017 12:56 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: 4.91 part B
- Replies: 1
- Views: 334
4.91 part B
Can someone please explain part B about why C6H4 might be highly reactive?
Re: Thio- ?
Mirrat wrote:yes, the ligands bond to the central metal atom.
But how do you know which one is bonding to the central atom?
- Tue Nov 28, 2017 8:28 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: polydentate? 17.33
- Replies: 3
- Views: 329
Re: polydentate? 17.33
When you draw the lewis structure for CO32-, there is one C-O double bond, and two single C-O bonds. The single bonds leave the oxygen atom with a -1 formal charge and these atoms have the potential to bind a metal atom in two different places, hence making CO32- a bidentate ligand. Ohhh so we use ...
- Sun Nov 26, 2017 10:20 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordinatiom compound vs TM complex
- Replies: 1
- Views: 239
Coordinatiom compound vs TM complex
What is the difference between tm complex and a coordination compound?
- Sat Nov 25, 2017 10:08 am
- Forum: Naming
- Topic: Naming coordination cmpd
- Replies: 2
- Views: 286
Re: Naming coordination cmpd
Brigitte Phung 1F wrote:In discussion, my TA stated that for the purposes of the test, two of the more important Latin root elements to remember are Copper and Iron. In a coordination compound with a negative charge, Copper is written as Cuprate and Iron is written as Ferrate.
thank you!!
Re: Thio- ?
Thio is used when an oxygen atom in the compound has been replaced by a sulfur atom. N or S is underlined depending on when it is the atom that 'links' to the compound, for eg O in H2O could be underlined to show that it is the one linking. wait, by linking do you mean forming a bond? So underline ...
- Sat Nov 25, 2017 10:04 am
- Forum: Naming
- Topic: 17.31 part D
- Replies: 3
- Views: 303
Re: 17.31 part D
The ligands only have to be in alphabetical order when writing out the name, when writing the formula for the compound the order doesn't matter. You should always write OH2 in coordination compounds instead of H2O. Oh, i was confused because 17.31 part C's answer has (H2O) instead of (OH2) can you ...
- Sat Nov 25, 2017 8:51 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: polydentate? 17.33
- Replies: 3
- Views: 329
polydentate? 17.33
Could someone please explain how to determine if a ligand is polydentate or not?
Also, how do you determine if a ligand, for example, CO3 2- (part b of 17.33) has atoms will lone pair of electrons which makes it polydentate? Is drawing the lewis structure the only way to determine it?
Also, how do you determine if a ligand, for example, CO3 2- (part b of 17.33) has atoms will lone pair of electrons which makes it polydentate? Is drawing the lewis structure the only way to determine it?
Thio- ?
I got teo questions:
Where did the prefix thio- come from in ligands such as NCS- (thiocyanato)?
Also, for NCS-, i saw in table 17.4 that either N or S is underlined. When is N underlined and when is S underlined?
Thanks
Where did the prefix thio- come from in ligands such as NCS- (thiocyanato)?
Also, for NCS-, i saw in table 17.4 that either N or S is underlined. When is N underlined and when is S underlined?
Thanks
- Fri Nov 24, 2017 2:40 pm
- Forum: Naming
- Topic: Naming coordination cmpd
- Replies: 2
- Views: 286
Naming coordination cmpd
As seen in the picture, it says that if the complex has ocerall negative charge, the suffix -ate is added to the stem of the metal’s name. Also, if symbol of metal has latin origins, then the latin stem is used. How can we know if an element has latin roots or not? Must we memorize all latin root el...
- Wed Nov 22, 2017 7:15 am
- Forum: Naming
- Topic: 17.31 part D
- Replies: 3
- Views: 303
17.31 part D
The question asks to write the formula for the following coordination compound D. Sodium bisoxalato(diaqua)ferrate(III) I was wondering why the answer is Na[Fe(OH2)2(C2O4)2] instead of (C2O4)2 being inront of (OH)2? I thought ligands were supposed to be in alphabetical order. Shouldnt oxalate come b...
- Thu Nov 16, 2017 8:20 am
- Forum: Sigma & Pi Bonds
- Topic: Sigma Bonds
- Replies: 4
- Views: 608
Re: Sigma Bonds
Sigma bonds refer to single bonds. Pi bonds are double, but it can be triple bonds too. A double bond contains one sigma bond and one pi bond. A triple bond contains one sigma bomd and two pi bonds.
- Tue Nov 14, 2017 3:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Dipole Moment
- Replies: 3
- Views: 290
Re: Dipole Moment
The element with higher electronegativity (higher pull for electrons) will have negative sign, and the element with lower electronegativity (less pull for electrons) will have positive sign. It makes sense, because if you want 'negative' more strongly, you will have partially negative sign. For exam...
- Tue Nov 07, 2017 2:15 pm
- Forum: Lewis Structures
- Topic: 3.41
- Replies: 1
- Views: 769
3.41
Ok.. so.. I have no clue how to draw lewis structures for these complex molecules, like glycine. Can someone explain the steps I should follow when drawing lewis structures for very very complicated molecules?
- Tue Nov 07, 2017 11:08 am
- Forum: Lewis Structures
- Topic: Central atom
- Replies: 2
- Views: 288
Central atom
Hi, I found on google that the least electronegative atom should be the central atom, but we learned in class that it should be the atom with least Ionization energy. Which is the correct one? Also, in one of the book examples in chapter 3, it asked to draw the lewis structure for KSCN ion, so SCN- ...
- Fri Nov 03, 2017 12:55 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2.55 part C
- Replies: 2
- Views: 306
Re: 2.55 part C
Emma Miltenberger 1K wrote:If you are referring to part C, it asks for the valence-shell configuration of the group 5 transition metals. I was confused on this as well. I think the solution manual made an error and is referring to the group 7 transition metals (Mg, Tc, Re, etc.).
yaa if that's the case, it all makes sense..
- Fri Nov 03, 2017 7:00 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: shielding effect of s and p-orbitals
- Replies: 4
- Views: 818
Re: shielding effect of s and p-orbitals
How does the ability to "penetrate" the nucleus account for higher Zeff? Ability to penetrate means that the electron can be closer to the nucleus, thus the net positive charge experienced by the electron will be stronger than the net positive charge experienced by the electron that's far...
- Fri Nov 03, 2017 6:56 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2.85
- Replies: 5
- Views: 507
Re: 2.85
thank you all so much! It makes sense now
- Fri Nov 03, 2017 6:54 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2.55 part C
- Replies: 2
- Views: 306
2.55 part C
The question asks for the notation for the valence-shell configuration (including the outermost d electrons) of the Group 15 elements. Since 3 of d shell is filled and both 2 electrons of s shell are filled, the valence shell notation should be (n-1)d^3 ns^2. However, the solutions manual says it's ...
- Thu Nov 02, 2017 9:06 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1.45
- Replies: 2
- Views: 384
1.45
I am confused on how to find delta V for heisenberg uncertainty equation. For example, for question 1.45, it says a bowling ball of mass 8 kg is rolled down a bowling alley lane at 5+/- 5 m/s (5 plus minus 5 meter/sec). What is the minimum uncertainty in its position? In the solutions manuel, it say...
- Tue Oct 31, 2017 10:37 am
- Forum: Octet Exceptions
- Topic: HW FOR THIS WEEK
- Replies: 1
- Views: 193
HW FOR THIS WEEK
Is the hw for discussions this week on ch 3 again? or ch 4?
- Sat Oct 28, 2017 9:16 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2.85
- Replies: 5
- Views: 507
2.85
The question is: ‘In the heavier transition metal elements, especially lanthanoids and actinoids, there are numerous exceptions to the regular order of orbital occupation predicted by the building-up principle. Sugfest why more exceptions would be noted for these elements’ I have seen the the soluti...
- Fri Oct 27, 2017 4:27 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: homework 3.23
- Replies: 4
- Views: 788
Re: homework 3.23
Element chlorine can have oxidizing state from -1 to +7. The atom can gain one more or lose several elections to reach relatively stable state. Oxidizing state represents the number of electron(s) atom gains/loses to form ion. (Positive means losing while negative means gaining) I get -1, cause tha...
- Fri Oct 27, 2017 4:26 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: homework 3.23
- Replies: 4
- Views: 788
Re: homework 3.23
But where do we get or how do we figure out what oxidation numbers chlorine can have. Or is it something we have to memorized because if I would know how to get that then I would be able to write the electron configuration. No, you would not have to memorize it, you can figure it out by looking at ...
- Thu Oct 26, 2017 10:10 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Removing an Electron [ENDORSED]
- Replies: 5
- Views: 831
Re: Removing an Electron [ENDORSED]
Yes, it is always the valence electron (the outermost electron) that will be removed. So yes, in the example you stated, electron from 2p5 will be removed
- Thu Oct 26, 2017 10:09 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs. Covalent Bonds [ENDORSED]
- Replies: 8
- Views: 1106
Re: Ionic vs. Covalent Bonds [ENDORSED]
Gabriela Carrillo 1B wrote:In relation to covalent and ionic bonds are Lewis diagrams only applicable to covalent bonds???
No, Lewis diagrams are applicable to ionic bonds also
- Sat Oct 21, 2017 9:46 am
- Forum: Properties of Electrons
- Topic: Electron Configuration [ENDORSED]
- Replies: 3
- Views: 619
Re: Electron Configuration [ENDORSED]
Shawn Patel 3C wrote:Hey,
I'm pretty sure Dr. Lavelle stated in class that the concept is good to know and understand, but you wouldn't get points marked off if you chose to not label px or py.
so for Nitrogen, for example, can I write 1s^2 2s^2 2P^3 ? Instead of 1s^2 2s^2 2Px^1 2Py^1 2Pz^1 ?
- Sat Oct 21, 2017 9:43 am
- Forum: SI Units, Unit Conversions
- Topic: Chemistry
- Replies: 3
- Views: 520
Re: Chemistry
wait are you asking how to convert cm in meter? Could you clarify your question? cause 100cm = 1m, thus 1cm = 0.01m
- Thu Oct 19, 2017 9:46 pm
- Forum: *Shrodinger Equation
- Topic: Ψ^2
- Replies: 2
- Views: 295
Re: Ψ^2
Ψ^2 is just the probability that you will find an electron in that location of an atom. Ψ^2 corresponds to the density of electrons because the higher the density of electrons, the higher the probability that you will find an electron in that particular location of the atom.
- Thu Oct 19, 2017 9:44 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Equation
- Replies: 7
- Views: 900
Re: Rydberg Equation
N1 is always the "final energy" lvl, so after the electron emits energy.
For example, if in the question, electron goes from n=4 to n=2, then N1=2 and N2=4.
For example, if in the question, electron goes from n=4 to n=2, then N1=2 and N2=4.
- Thu Oct 19, 2017 9:41 pm
- Forum: Properties of Light
- Topic: Color of visible light
- Replies: 11
- Views: 1251
Re: Color of visible light
Charlotte Shieh 1F wrote:If an atomic spectra lies within the visible light spectrum (Balmer series), would we be expected to know what color light it is?
Just know that red is 700nm and violet is 400nm
- Fri Oct 13, 2017 9:35 pm
- Forum: Properties of Light
- Topic: Balmer Vs. Lyman
- Replies: 15
- Views: 4210
Re: Balmer Vs. Lyman
How does one determine whether emission is in part of the balmer series or lyman series? I know that the visible region is associated with the balmer series and the ultraviolet region associates the lyman series, but how do we determine the energy value? It's part of balmer series when energy that ...
- Thu Oct 12, 2017 11:56 pm
- Forum: Properties of Light
- Topic: Nuclear Model of the Atom
- Replies: 2
- Views: 437
Re: Nuclear Model of the Atom
Thomson thought that atoms are uniform spheres of positively charged matter in which electrons are embedded, whereas Rutherford stated that atoms are made of electrons that orbit a positively charged nucleus made up of protons and neutrons. To further clarify, Thomson had the "plum pudding&quo...
- Thu Oct 12, 2017 11:48 pm
- Forum: Properties of Light
- Topic: Speed of Light Constant
- Replies: 18
- Views: 1782
Re: Speed of Light Constant
I would use 3.00 x 10^8 for the homework problems, since Dr.Lavelle used it in his lecture~ but like the above reply said, i'm sure it will be more clear on the tests
- Thu Oct 12, 2017 11:44 pm
- Forum: Properties of Light
- Topic: 1.11 [ENDORSED]
- Replies: 3
- Views: 620
1.11 [ENDORSED]
So the question is "In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series(for ex, Balmer, Lyman, Paschen series), as shown in figs 1.1 ans 2.1. What is common to the lines within a series that makes grouping them togehter logical?" I w...
- Thu Oct 12, 2017 11:41 pm
- Forum: Properties of Light
- Topic: HW Problem 1.3
- Replies: 4
- Views: 610
Re: HW Problem 1.3
Another way of looking at it is when frequency decreases, wavelength increases and when you draw that out, the slope of the waves look flatter. Since slope is basically the same as "extent of change" (slope is the change in y over the change in x), a flatter or I guess you could say small...
- Thu Oct 12, 2017 11:27 pm
- Forum: Properties of Light
- Topic: Balmer Vs. Lyman
- Replies: 15
- Views: 4210
Re: Balmer Vs. Lyman
I read that section of the textbook (about the series), but I do not even get what those series are supposed to represent.. or what purpose they serve.. can someone explain please?
Also, there is the expression for balmer series and rydberg, but what is the expression for the Lyman series?
Thanks!
Also, there is the expression for balmer series and rydberg, but what is the expression for the Lyman series?
Thanks!
- Thu Oct 05, 2017 7:11 pm
- Forum: Limiting Reactant Calculations
- Topic: M11
- Replies: 5
- Views: 5132
Re: M11
I did it a little differently from the book but got similar answers (around .05 off - not sure if that's a huge problem), so hope this helps c: You have to find the limiting reactant of P4O6 first. I converted 5.77g P4 to moles: The molar mass of P4 is 123.88g 5.77g/123.88g = 0.0466 mol P4. The rat...
- Thu Oct 05, 2017 7:04 pm
- Forum: Limiting Reactant Calculations
- Topic: m11
- Replies: 7
- Views: 1036
Re: m11
When you use 5.77g P4 again in the second question, it's just to convert it to P4O6 because you want to find how much P4O6 came out of the first equation to use in the second equation. You would use the mole ratio so that 1 mole P4 equals 1 mole of P4O6, and then solve for how much oxygen you need,...
- Thu Oct 05, 2017 5:35 pm
- Forum: Limiting Reactant Calculations
- Topic: m11
- Replies: 7
- Views: 1036
Re: m11
There are two equations to the problem. For the first equation, if you use all the P4 and calculate the amount of O2 needed, you get 4.47g O2. Since you originally had 5.77g O2, you still have 1.30g O2 left. For the second equation, you use 5.77g P4 again but in the context of the second equation t...
- Thu Oct 05, 2017 5:03 pm
- Forum: Limiting Reactant Calculations
- Topic: M11
- Replies: 5
- Views: 5132
M11
A reaction vessel contains 5.77 g of white phosphorous and 5.77 g of oxygen. The first reaction to take place is the formation of phosphorus (III) oxide, P4O6: P4 + 3O2 --> P4O6(s). If enough oxygen is present, the oxygen can react futher with this oxide to produce phosphorus (V) oxide, P4O10: P4O6 ...
- Thu Oct 05, 2017 4:53 pm
- Forum: Empirical & Molecular Formulas
- Topic: L.39(b)
- Replies: 4
- Views: 607
Re: L.39(b)
Hi, the (IV) in the name tin(IV) Oxide is the oxidation number of the tin metal. Also, the roman numeral is used to distinguish between SnO and SnO2, because both of them are tin oxide, but they have different oxidation numbers. So SnO would be Tin (II) Oxide, and SnO2 would be Tin(IV) Oxide. Hope t...
- Thu Oct 05, 2017 4:45 pm
- Forum: Student Social/Study Group
- Topic: Fundamental M.25
- Replies: 3
- Views: 1556
Re: Fundamental M.25
1. Use the molecule formula C10H7OH to calculate mass percentage composition of C, H, O 2. Get the simplest ratio of mass of C, H, O in C10H7OH (C:H:O=15:1:2) 3. Get the percentage of O in C10H7OH in the sample using the ratio above (H : O = 5.20% : ? = 1:2 --> ? = 10.40%) 4. Add up the percentage ...