Search found 105 matches
- Sat Mar 14, 2020 2:12 pm
- Forum: First Order Reactions
- Topic: Linear versus Non-Linear
- Replies: 3
- Views: 359
Linear versus Non-Linear
Hoe do you know when to use the linear first order integrated rate law (ln[A]=-kt+ln[A initial]) versus the nonlinear form ([A]=[A initial]e^-kt)?
- Tue Mar 10, 2020 2:22 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Slow step
- Replies: 7
- Views: 432
Re: Slow step
How would we determine what the intermediate reaction is if we are not given it?
- Tue Mar 10, 2020 2:19 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Determining reaction rate for overall reaction
- Replies: 3
- Views: 275
Re: Determining reaction rate for overall reaction
PranaviKolla2B wrote:Just to confirm, the slowest step is the rate-determining step?
Yes, the slowest step is the rate determining step.
- Tue Mar 10, 2020 2:11 pm
- Forum: Second Order Reactions
- Topic: Final Exam Equations
- Replies: 10
- Views: 749
Re: Final Exam Equations
Yes these equations will be given but you will have to know which ones go with which order reactions. The equation sheet will be the same one on the class website and the one we got for the midterm.
- Mon Mar 09, 2020 1:47 pm
- Forum: General Rate Laws
- Topic: Definition
- Replies: 4
- Views: 374
Re: Definition
How do you know when to use each equation? For example how would you know to use the integrated rate law versus the differential rate law?
- Mon Mar 09, 2020 1:42 pm
- Forum: General Rate Laws
- Topic: integrated rate law vs general
- Replies: 8
- Views: 705
Re: integrated rate law vs general
What is each one used for?
- Fri Mar 06, 2020 5:06 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Forward and reverse reaction rates
- Replies: 4
- Views: 338
Re: Forward and reverse reaction rates
k' signifies the reverse reaction rate specifically.
- Fri Mar 06, 2020 5:03 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: different units
- Replies: 4
- Views: 363
Re: different units
The units of k specifically in different order reactions are
zero-order M/s
first-order 1/s
second-order 1/M*s
zero-order M/s
first-order 1/s
second-order 1/M*s
- Fri Mar 06, 2020 4:58 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: reactant vs product
- Replies: 4
- Views: 409
Re: reactant vs product
Will we ever use [P]? If so when?
- Wed Mar 04, 2020 8:36 pm
- Forum: General Rate Laws
- Topic: Determining Order
- Replies: 6
- Views: 446
Re: Determining Order
What is meant by the order of a reaction?
- Wed Mar 04, 2020 8:35 pm
- Forum: General Rate Laws
- Topic: rate law definition
- Replies: 4
- Views: 368
Re: rate law definition
What are some applications of rate laws?
- Wed Mar 04, 2020 8:34 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics in Test 2?
- Replies: 13
- Views: 786
Re: Kinetics in Test 2?
Test two will cover the last page of thermodynamics and all of electrochem.
- Wed Feb 26, 2020 3:13 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cathode vs Anode
- Replies: 6
- Views: 421
Re: Cathode vs Anode
When finding cell potential from Appendix B why are all the half reactions written with the electrons on the left regardless of how they are written in the half reaction?
- Wed Feb 26, 2020 3:06 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff equation
- Replies: 11
- Views: 1233
Re: Van't Hoff equation
What is this equation used for? When would we know to use it or to derive it?
- Wed Feb 26, 2020 3:05 pm
- Forum: Van't Hoff Equation
- Topic: Van’t Hoff Equation
- Replies: 11
- Views: 906
Re: Van’t Hoff Equation
805097738 wrote:kristi le 2F wrote:The vant hoff equation can be used to calculate K at different temperatures if stand enthalpy of real lion is known.
what is real lion
probably "real ion" if I had to guess
- Wed Feb 26, 2020 3:04 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Products and Reactants
- Replies: 5
- Views: 371
Products and Reactants
When finding K or Q like in the 6N problems, how do we know what the products and reactants are? Do we look at the final combined equation after finding the half reactions?
- Wed Feb 26, 2020 1:50 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 6N.5 part A
- Replies: 1
- Views: 171
6N.5 part A
On this question why do we have to switch to log instead of using ln and where does the 2.303 come from? Is there a reason you couldn't use ln and just take the e of both sides to cancel out the ln?
- Thu Feb 20, 2020 7:13 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation number of Ozone
- Replies: 10
- Views: 697
Re: Oxidation number of Ozone
How do you find oxidation numbers?
- Thu Feb 20, 2020 7:11 pm
- Forum: Balancing Redox Reactions
- Topic: 6L.5
- Replies: 1
- Views: 218
6L.5
On question 6L.5 part B, Write the half reactions, the balanced equation for the cell reaction, and the cell diagram for each of the following skeletal equations: B. Ce4+ +I- = I2 + Ce3+, how do we know to add Pt to the skeletal equation?
- Wed Feb 19, 2020 8:44 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation Numbers
- Replies: 7
- Views: 419
Re: Oxidation Numbers
What are oxidation numbers used for?
- Wed Feb 19, 2020 2:22 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridges
- Replies: 2
- Views: 252
Re: Salt Bridges
There are two types of salt bridges, a glass tube bridge and a filter paper bridge. The glass tube bridge is filled with an electrolyte such as sodium chloride, potassium chloride or potassium nitrate. The second kind is either made of filter paper or a porous material soaked in an electrolyte.
- Tue Feb 18, 2020 5:05 pm
- Forum: Balancing Redox Reactions
- Topic: Half Reactions
- Replies: 7
- Views: 449
Re: Half Reactions
Splitting the overall reaction into half reactions is also helpful when balancing redox reactions. This makes it easier to balance the H and the O atoms separately using H20 and H+ ions. It also helps to determine the total electrons needed to balance charges in the reaction. Is balancing the react...
- Tue Feb 11, 2020 8:23 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Using Cp vs just R or C for ΔS
- Replies: 2
- Views: 204
Re: Using Cp vs just R or C for ΔS
Which equation to use is dependent on which information you were given in the problem or which information could be solved for and then plugged into another equation. You really have to combine equations and move things around to fit what info you were given.
- Tue Feb 11, 2020 8:13 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Extra Practice
- Replies: 4
- Views: 302
Re: Extra Practice
You also can google examples of these problems are there are probably tons that will come up from other teachers or classes.
- Tue Feb 11, 2020 8:11 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: U(total)=(3/2)nrt
- Replies: 2
- Views: 190
Re: U(total)=(3/2)nrt
705087773 wrote:using 3/2R is for if there is constant volume in the process
5/2R is for constant pressure, correct?
- Mon Feb 10, 2020 4:05 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 4J.7
- Replies: 2
- Views: 209
Re: 4J.7
Make sure also when looking at the values for delta H and delta S you take into account that one is given in J and the other in KJ so you will have to convert one or the other.
- Mon Feb 10, 2020 4:03 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Spontaneous Reactions
- Replies: 2
- Views: 139
Re: Spontaneous Reactions
You look at the value for deltaG. If deltaG is negative it is spontaneous and if it is positive it is not spontaneous. Similarly there was a question about whether a compound would be stable or unstable based on its deltaG value and if the value is negative the compound is stable, is the value is po...
- Tue Feb 04, 2020 3:03 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible/Irreversible Reactions
- Replies: 6
- Views: 322
Re: Reversible/Irreversible Reactions
On a test question would it always specify that the reaction is happening irreversibly or reversibly?
- Tue Feb 04, 2020 2:54 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: molar entropy
- Replies: 2
- Views: 234
Re: molar entropy
Here's a website that has some rules on how to tell which molecule will have the higher molar entropy! https://opentextbc.ca/introductorychemi ... changes-2/
- Tue Feb 04, 2020 2:52 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: overall definitions
- Replies: 4
- Views: 207
Re: overall definitions
This is so helpful thank you!
- Tue Feb 04, 2020 2:46 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: HW 4F.9
- Replies: 2
- Views: 132
Re: HW 4F.9
I had this same question because when I first tried to solve it I calculated each volume using PV=nRT and then substituted them into the nRln(V2/V1) equation, however I got the wrong answer because I didn't realize we can just plug the inverse of the pressures right into the equation instead of usin...
- Tue Feb 04, 2020 2:41 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Microstates
- Replies: 5
- Views: 198
Re: Microstates
When calculating for the micro states what number do we raise to the n?
- Fri Jan 31, 2020 7:04 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase Changes
- Replies: 17
- Views: 675
Re: Phase Changes
Yes, the temperature stays constant while the energy continues to increase.
- Fri Jan 31, 2020 7:02 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: qp and qv
- Replies: 8
- Views: 346
Re: qp and qv
This is because by definition delta H only equals q at constant pressure.
- Wed Jan 29, 2020 1:37 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Homework for Week 4
- Replies: 2
- Views: 138
Re: Homework for Week 4
Yes, every week you just pick 5 that go with whichever outline we are on in class. You could do all 5 problems from 4A if you wanted or do some from A, some from C and some from D.
- Wed Jan 29, 2020 1:35 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: temperature
- Replies: 4
- Views: 149
Re: temperature
It depends on what the problem gives you. Just make sure for any given problem that you use the units that match the constant you're given.
- Tue Jan 28, 2020 11:20 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Units
- Replies: 5
- Views: 172
Units
Unless specified by the problem would it matter on a test whether our answers are in J or KJ?
- Thu Jan 23, 2020 5:18 pm
- Forum: Phase Changes & Related Calculations
- Topic: Autoprotolysis
- Replies: 15
- Views: 740
Re: Autoprotolysis
Emily Lo 1J wrote:It is the transfer of a proton between the same type of molecule. An example of it would be 2H2O H3O + OH
What are some other common examples of autoprotolysis besides water?
- Thu Jan 23, 2020 5:14 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Heat Capacity Intensive or Extensive?
- Replies: 4
- Views: 650
Re: Heat Capacity Intensive or Extensive?
MariahClark 2F wrote:I don't know about your reasoning, but heat capacity is extensive. It changes when it becomes specific heat capacity, as that is intensive instead.
What is the difference between intensive and extensive in general?
- Thu Jan 23, 2020 5:13 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: state property
- Replies: 5
- Views: 109
Re: state property
What are others examples of things that could be state properties?
- Thu Jan 23, 2020 5:11 pm
- Forum: Phase Changes & Related Calculations
- Topic: Thermochemistry homework problems
- Replies: 2
- Views: 60
Re: Thermochemistry homework problems
Do problems from chapter 4 as that is the chapter we are starting. If we start a new topic halfway through the week it normally doesn't matter which section you do problems from as long as they were covered recently.
- Thu Jan 23, 2020 5:05 pm
- Forum: Phase Changes & Related Calculations
- Topic: Internal Energy Change
- Replies: 3
- Views: 121
Re: Internal Energy Change
The internal energy change is the value of the potential energy plus the kinetic energy. We use this to tell whether energy is coming into or out of the system in the form of heat or work. The equation is deltaU=q+w where w is work and q is heat.
- Wed Jan 15, 2020 8:54 pm
- Forum: Ideal Gases
- Topic: ICE tables
- Replies: 9
- Views: 1446
Re: ICE tables
If the questions asks for just K, and not Kc or Kp, then you need to look at the equation. If the reactants and products are gases then you should use Kp, because it is implied. If the reactants and products of the equation are aqueous then you should use Kc because it is implied. However if it ask...
- Wed Jan 15, 2020 8:41 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Compression on Equilibrium
- Replies: 4
- Views: 239
Re: Compression on Equilibrium
Neither would be favored because you have the same number of moles on either side.
- Wed Jan 15, 2020 8:38 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3008689
Re: Post All Chemistry Jokes Here
Why can you never trust atoms?
Because they make everything up.
Because they make everything up.
- Wed Jan 15, 2020 8:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: When to use K and Kp
- Replies: 12
- Views: 371
Re: When to use K and Kp
Kallista McCarty 1C wrote:Kristina Rizo 2K wrote:I thought Kp was used for gas only? Can someone clarify this please.
Kp is used for gases to determine partial pressures! Kc is used for concentrations and Ka and Kb are for acids and bases.
This might be a dumb question but you calculate all of these the same way right, with products/reactants?
- Wed Jan 15, 2020 8:19 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Water in Acid-Base Equilibria
- Replies: 3
- Views: 91
Re: Water in Acid-Base Equilibria
Liquids and pure solids are never included in equilibrium calculations.
- Wed Jan 15, 2020 8:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Study Guide Test One
- Replies: 17
- Views: 611
Re: Study Guide Test One
Some of the UA's also give out review sheets during their Peer Learning sessions.
- Thu Jan 09, 2020 5:05 pm
- Forum: Ideal Gases
- Topic: K based on phases
- Replies: 4
- Views: 248
Re: K based on phases
You will never include the concentrations of solids and liquids because, for example, when a solid is dissolved in water the concentration changes such a small amount that it is almost insignificant unlike with a gas where the concentration does change.
- Thu Jan 09, 2020 8:34 am
- Forum: Ideal Gases
- Topic: Understanding Q
- Replies: 19
- Views: 685
Re: Understanding Q
Yes, you would still omit solids and pure liquids. You also emit these when making an ICE table.
- Wed Jan 08, 2020 2:30 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Homework 5J.1c
- Replies: 3
- Views: 141
Re: Homework 5J.1c
If you add something to either the products or reactant side the reaction will shift to the opposite side and if you take a product or reactant away the reaction shifts to the side you took it from. In this case it would shift to the right, as you took away a reactant, and the amount of H2 would inc...
- Wed Jan 08, 2020 2:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Partial Pressure vs. Concentration
- Replies: 4
- Views: 127
Re: Partial Pressure vs. Concentration
Kp can only be used for gases because only gases can exert pressure on a container. Therefore, if you only have aqueous solutions in your chemical equation, then you know you must calculate for Kc since there are no gases. If you have only gases in your chemical equation, you can solve for either K...
- Wed Jan 08, 2020 2:23 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Textbook question 5I.3
- Replies: 2
- Views: 152
Re: Textbook question 5I.3
I need this as well. I keep getting a different answer too.
- Fri Dec 06, 2019 10:05 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final exam
- Replies: 17
- Views: 880
Re: Final exam
ShastaB4C wrote:Does anyone know approximately how many questions the final exam will be?
On the page about final locations and review sessions it says there will be 8 questions on the final.
- Fri Dec 06, 2019 10:04 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Sig Figs in 6B3
- Replies: 3
- Views: 378
Re: Sig Figs in 6B3
When looking at pH and pOH there are different significant figure rules, here's a website that explains what they are. http://abacus.bates.edu/acad/depts/biobook/How-SigF.pdf
- Thu Dec 05, 2019 2:45 pm
- Forum: Air Pollution & Acid Rain
- Topic: reactions of acid rain
- Replies: 3
- Views: 987
Re: reactions of acid rain
The chemical equations that produce acid rain are done in a few parts. In regards to nitric acid the first equation that takes place is N2 +O2 =2NO, then the second equation is 2NO + O2 = 2NO2. The last equation that happens is 3NO2 + 3H2O = (2H3O+) + (2NO3-) + NO. Sulfuric acid is formed in three d...
- Mon Dec 02, 2019 9:33 am
- Forum: Hybridization
- Topic: 2F.5
- Replies: 4
- Views: 345
Re: 2F.5
Here's a good video that goes through types of hybridization with lots of examples!
https://www.youtube.com/watch?v=otYj92d7rB0
https://www.youtube.com/watch?v=otYj92d7rB0
- Mon Dec 02, 2019 9:31 am
- Forum: Amphoteric Compounds
- Topic: Memorizing Amphoteric Oxides
- Replies: 2
- Views: 191
Re: Memorizing Amphoteric Oxides
My TA said the same thing which is they will most likely give us the obvious ones that follow the pattern of the diagonal band, which you can find charts of online, instead of the ones on the edge that aren't as obvious.
- Sat Nov 30, 2019 2:32 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: [H3O+] and [OH-]
- Replies: 3
- Views: 252
[H3O+] and [OH-]
How do you convert between [H3O+] and [OH-] such as in problem 6B.9?
- Fri Nov 29, 2019 11:21 am
- Forum: Lewis Acids & Bases
- Topic: Weak and Strong Acids and Bases
- Replies: 3
- Views: 206
Re: Weak and Strong Acids and Bases
Mt TA told us some tips which are that inorganic acids are typically strong acids and organic acids are typically weak. To tell the inorganic from the organic, the inorganic normally have the H at the front ( ex. HCl, H2SO4, HClO3) while the organic have the H at the end (ex. CH3COOH, CH3CH(OH)).
- Mon Nov 25, 2019 1:54 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: acids
- Replies: 4
- Views: 335
Re: acids
Midori Hupfeld 3D wrote:Do acids always have a hydrogen ion in them?
Yes, acids always have hydrogen as acids form hydrogen when they disassociate in water.
- Mon Nov 25, 2019 1:50 pm
- Forum: Bronsted Acids & Bases
- Topic: 6A.5
- Replies: 1
- Views: 108
6A.5
How would you determine which compound is an acid and a base in the equation on question 6A.5?
- Mon Nov 25, 2019 1:47 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: coordination number
- Replies: 2
- Views: 281
Re: coordination number
Here's a website that explains all the shapes based on the coordination number and tells a little about each. https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Supplemental_Modules_(Inorganic_Chemistry)/Coordination_Chemistry/Structure_and_Nomenclature_of_Coordination_Compounds/Coordinatio...
- Mon Nov 25, 2019 1:44 pm
- Forum: Amphoteric Compounds
- Topic: Amphiprotic
- Replies: 11
- Views: 558
Re: Amphiprotic
Is there a way to tell if something is amphiprotic?
- Mon Nov 25, 2019 1:41 pm
- Forum: Lewis Acids & Bases
- Topic: When is an acid considered Bronsted?
- Replies: 9
- Views: 558
Re: When is an acid considered Bronsted?
Why are there there two definitions for acids and bases? Why not just one?
- Sat Nov 23, 2019 11:48 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Where is this chapter in the textbook
- Replies: 1
- Views: 171
Re: Where is this chapter in the textbook
In 9C there is mention of them and there is a table with all the common ligands, the chapter isn't specifically about ligands however.
- Sat Nov 23, 2019 11:45 am
- Forum: Naming
- Topic: Negative charge with Coordination Compound
- Replies: 3
- Views: 207
Re: Negative charge with Coordination Compound
If it is positively charged do we add anything to the end like we do when its negative?
Re: Naming
How many of the common ligands do we need to know? Just the ones on the chart on page 724 of the textbook or are there more we need to know as well?
9C.7
In 9C.7 the question asks "Which of the following isomers of diaminobenzene can form chelating complexes" and then gives three example. How would you go about answering this question?
- Sat Nov 16, 2019 1:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 9
- Views: 499
Re: Bond Angles
So we basically just have to memorize which bond angles go with which shapes?
- Fri Nov 15, 2019 1:53 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma & Pi Bonds
- Replies: 5
- Views: 226
Re: Sigma & Pi Bonds
Pi bonds are also more commonly found in double and triple bonds, while they are not included in single bonds. Pi bonds add bond strength to the bonds - hence why double and triple bonds are stronger than single bonds. All types of bonds have sigma bonds. So basically most first bonds are sigma bon...
- Thu Nov 14, 2019 2:39 pm
- Forum: Dipole Moments
- Topic: Strength of Interactions
- Replies: 4
- Views: 138
Re: Strength of Interactions
The order of inter molecular forces from strongest to weakest are ion-ion, ion-dipole, hydrogen bonds, dipole-dipole, and dipole induced- dipole.
- Mon Nov 11, 2019 12:58 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Boiling and Melting Points
- Replies: 7
- Views: 491
Re: Boiling and Melting Points
The stronger the intermolecular forces the higher the boiling point/melting point will be. Generally, polar molecules have dipole-dipole forces, making them have stronger intermolecular forces than nonpolar molecules, thus, they will boil/melt at a higher temperature. How do we find these intermole...
- Mon Nov 11, 2019 12:49 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: difference between intermolecular forces
- Replies: 3
- Views: 167
Re: difference between intermolecular forces
Are N, O and F the only atoms that will be involved with hydrogen bonds. Say you had a molecule without one of these could it form a hydrogen bond?
- Mon Nov 11, 2019 12:47 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Test 2
- Replies: 6
- Views: 282
Re: Test 2
Everything from after the midterm up until the test.
- Sat Nov 09, 2019 2:32 pm
- Forum: Bond Lengths & Energies
- Topic: Midterm
- Replies: 9
- Views: 475
Re: Midterm
Dr. Lavelle said we will get them back on Wednesday during lecture.
- Sat Nov 09, 2019 2:31 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarisability vs Polarizing Power
- Replies: 15
- Views: 1084
Re: Polarisability vs Polarizing Power
Is there a trend on the periodic table that tells polarisability and polarizing power or we just have to know based on the size of the cation?
- Sat Nov 09, 2019 2:28 pm
- Forum: SI Units, Unit Conversions
- Topic: Memorizing Conversions
- Replies: 25
- Views: 1294
Re: Memorizing Conversions
Most of the conversions will be given but some of them you might have to memorize. A sample sheet of the constants, equations, and conversions we are given for tests is on Dr. Lavelle's website.
- Mon Nov 04, 2019 9:27 am
- Forum: Trends in The Periodic Table
- Topic: Electronegativity
- Replies: 11
- Views: 656
Re: Electronegativity
Most likely we will just need to know that electronegativity increases up a a group and to the right across a period.
- Sun Nov 03, 2019 8:01 am
- Forum: Dipole Moments
- Topic: Midterm
- Replies: 8
- Views: 319
Re: Midterm
On the topic of the midterm, will we need to know content up to Mondays lecture or last Fridays lecture?
- Wed Oct 30, 2019 9:28 am
- Forum: Lewis Structures
- Topic: Formal charge
- Replies: 9
- Views: 234
Re: Formal charge
Can someone explain how to find the lone pair electrons when trying to find the formal charge? When finding lone pair electrons you just count the pairs of electrons that are not bonded to another element. For example in the Lewis structure for water, the O has two bonds and two lone pairs because ...
- Tue Oct 29, 2019 4:52 pm
- Forum: Bond Lengths & Energies
- Topic: Bond lengths
- Replies: 15
- Views: 988
Re: Bond lengths
Are bond lengths different for each molecule or are they always the same length?
- Tue Oct 29, 2019 4:45 pm
- Forum: Resonance Structures
- Topic: Bond Order
- Replies: 2
- Views: 93
Re: Bond Order
Here's a really good website that explains it! Basically you just divide the number of bonds by the number of bond groups within a certain compound. https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Chem...
- Tue Oct 29, 2019 4:40 pm
- Forum: Ionic & Covalent Bonds
- Topic: 4f, 5f Electron Configurations
- Replies: 2
- Views: 107
Re: 4f, 5f Electron Configurations
you could think about it as f-d-s-p i guess. for ex, if you wanted the electron configuration for gold (Au), you would write it as [Xe]4f^14 5d^10 6s^1. you would do the same thing for 5f too On the exceptions like Cr and Cu where we take an electron away from the s orbital and put it in the d orbi...
- Mon Oct 28, 2019 2:06 pm
- Forum: Ionic & Covalent Bonds
- Topic: Number of Chemistry Community Posts
- Replies: 3
- Views: 130
Re: Number of Chemistry Community Posts
As on last night you should have posted 20 times I think because we just finished week 4.
- Mon Oct 21, 2019 9:29 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: How to use it
- Replies: 5
- Views: 238
Re: How to use it
zoedfinch1K wrote:In addition to Brianna Becerra 1F, you would typically use this equation when being asked for the minimum uncertainty in speed/velocity when given the physical constraints or vice versa.
Is minimum uncertainty something different or when we solve this equation we get minimum uncertainty?
- Mon Oct 21, 2019 9:25 am
- Forum: *Shrodinger Equation
- Topic: Review
- Replies: 4
- Views: 146
Re: Review
If you go to one of the peer learning sessions and ask they will go over it and do practice problems.
- Mon Oct 21, 2019 9:20 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Filling the 4s and 3d blocks
- Replies: 3
- Views: 113
Re: Filling the 4s and 3d blocks
In a cases like this we write the d block before the s block right? I've seen example where the electron configurations are written either way so I wasn't sure if we are supposed to do it a certain way.
- Mon Oct 21, 2019 9:16 am
- Forum: Trends in The Periodic Table
- Topic: 1F.6
- Replies: 1
- Views: 83
1F.6
For question 1F.6, we're asked to find the element in a given pair that has the smaller second ionization energy, how do you find the second ionization energy?
- Mon Oct 21, 2019 9:13 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Exceptions in Electron Configurations
- Replies: 5
- Views: 164
Re: Exceptions in Electron Configurations
Besides chromium and copper are there any other ones we should know?
- Mon Oct 14, 2019 9:33 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: HW question 1A.15
- Replies: 2
- Views: 127
Re: HW question 1A.15
We know that the ultraviolet region of hydrogen has an energy level of n=1. With 102.6 nm we can find the frequency using v=speed of light/wavelength 2.998*10^8 m.s^-1 / (102.6*10^-9 m) = 2.922*10^15 s^-1 We then use the Rydberg formula, so v=R((1/n1 ^2) - (1/n2 ^2)) 1/n2 ^2 = 1- ((2.922*10^15 s^-1...
- Mon Oct 14, 2019 9:28 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Question 1D.17
- Replies: 1
- Views: 128
Question 1D.17
How would I start to answer this question? For each orbital listed in exercise 1D.15, give possible values of the magnetic quantum number.
- Mon Oct 14, 2019 9:23 am
- Forum: Photoelectric Effect
- Topic: Confusion on equations
- Replies: 9
- Views: 349
Re: Confusion on equations
Depending on what values you are given you also can rearrange each equation and combine them to find unknown variables. For instance if you were asked to solve for energy and you were only given wavelength not frequency, you can solve the equation lambda*v=c for v so that you can then plug your new ...
- Mon Oct 14, 2019 9:17 am
- Forum: Photoelectric Effect
- Topic: Threshold and activation energy
- Replies: 3
- Views: 190
Re: Threshold and activation energy
Threshold energy is the energy needed to make effective collisions while activation energy is the energy needed to make these collisions even occur. A molecule normally doesn't have enough threshold energy to make this occur so it needs activation energy to start these collisions.
- Mon Oct 14, 2019 9:13 am
- Forum: Properties of Electrons
- Topic: Photons
- Replies: 9
- Views: 293
Re: Photons
Yes, even if the photon has some energy, but not enough to get the electron the the next energy level, then the electron will not be ejected as it cannot go halfway between energy levels.
- Tue Oct 08, 2019 12:01 pm
- Forum: Properties of Light
- Topic: Question 1A.3 c
- Replies: 5
- Views: 342
Re: Question 1A.3 c
Can somebody explain to me why it isn't B?
- Tue Oct 08, 2019 11:56 am
- Forum: Empirical & Molecular Formulas
- Topic: Fundamental F.19
- Replies: 3
- Views: 228
Re: Fundamental F.19
If we hadn't been given the molar mass of the compound would there have been anyway to tell what the molecular formula was?
- Tue Oct 08, 2019 11:52 am
- Forum: Balancing Chemical Reactions
- Topic: How to write reactions for tests
- Replies: 5
- Views: 214
Re: How to write reactions for tests
My TA said we should write them, but I also heard from a UA that we probably won't need to, so maybe write them if you know them just to be safe.
- Tue Oct 08, 2019 11:49 am
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 7210
Re: Week 2 Homework Problems [ENDORSED]
Jaklin Astvatsatryan 3G wrote:Lauren Sanchez 3D wrote:Just to make sure, the homework problems are now due during our actual discussions right?
Yes. Our TA's will be collecting them the day of your discussion.
Our answers on chemistry community will always be due Sunday night though right?
- Tue Oct 08, 2019 11:36 am
- Forum: Properties of Light
- Topic: Hw Question 1A.9
- Replies: 5
- Views: 636
Hw Question 1A.9
For the question 1A.9, how would you find the the wavelength and frequency that go along with the second line that says 3.3X10^-19J?