If it's endothermic you can treat heat like a reactant and if its exothermic you can treat heat like a product and apply Le Chatlier's principle like that.
Ex. 3H2 + N2 -> 2NH3 + Heat (exothermic). If you add heat to this reaction it'll shift left.
Search found 120 matches
- Sun Mar 15, 2020 8:01 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: le chatelier's principle on temp
- Replies: 4
- Views: 471
- Sun Mar 15, 2020 7:51 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetic vs thermodynamics
- Replies: 8
- Views: 516
Re: Kinetic vs thermodynamics
You use kinetics when you are observing the speed/rate of a reaction and use thermodynamics to tell if the reaction is favored or not
- Sun Mar 15, 2020 7:47 am
- Forum: Zero Order Reactions
- Topic: What do each orders mean
- Replies: 7
- Views: 547
Re: What do each orders mean
Zero order - rate doesn't depend on concentration
First order - depends on one concentration
Second order - depends on two concentrations or the square of one
First order - depends on one concentration
Second order - depends on two concentrations or the square of one
- Tue Mar 10, 2020 9:43 pm
- Forum: Balancing Redox Reactions
- Topic: Test 2 Return
- Replies: 20
- Views: 1156
Test 2 Return
Does anyone know how we are going to get our test 2 back since in-person classes got cancelled?
- Tue Mar 10, 2020 4:37 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Review Sessions
- Replies: 2
- Views: 240
Review Sessions
Are our review sessions going to be cancelled too?
- Sun Mar 08, 2020 9:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: TesT 2
- Replies: 3
- Views: 268
Re: TesT 2
We'll probably get them back week 10 in section but i'm not 100% sure
- Wed Mar 04, 2020 6:48 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6.73
- Replies: 1
- Views: 184
6.73
How in the world do you do 6.73. Am I looking at the wrong appendix or something?
- Wed Mar 04, 2020 6:44 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6.57
- Replies: 1
- Views: 165
6.57
Can anyone explain why for 6.57 the given rxn is the anode?
- Wed Mar 04, 2020 6:17 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: E* vs E
- Replies: 1
- Views: 156
E* vs E
Can anyone explain the difference between E* and E in terms of the homework problem 6.43? Like how do we know what effects/changes their values?
- Mon Mar 02, 2020 4:48 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram for 6L.5(b)
- Replies: 2
- Views: 172
Cell Diagram for 6L.5(b)
Can anyone explain why in the cell diagram for 6L.5(b) the solid I2 is written before the I- (aq)?
- Mon Mar 02, 2020 3:34 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Redox Reaction in 6L.3(d)
- Replies: 1
- Views: 153
Balancing Redox Reaction in 6L.3(d)
Can anybody help me with balancing the cathode/reduction reaction in 6L.3(d)?
The cell diagram for the cathode is II OH-(aq) I O2(g) I Pt(s)
The cell diagram for the cathode is II OH-(aq) I O2(g) I Pt(s)
- Mon Mar 02, 2020 2:52 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: G=-nFE
- Replies: 5
- Views: 385
G=-nFE
When we use deltaG=-nFE, how do we know what n to use?
- Sun Mar 01, 2020 10:38 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Degree symbol
- Replies: 10
- Views: 962
Re: Degree symbol
The degree symbol indicates that the reaction you are observing was done under standard conditions (298K, 1 bar)
- Sun Mar 01, 2020 10:34 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cathode/Right & Anode/Left
- Replies: 7
- Views: 996
Cathode/Right & Anode/Left
On tests for example, will the cathode always be on the right and the anode always on the left?
If not, how do I tell which is the anode and which is the cathode?
If not, how do I tell which is the anode and which is the cathode?
- Sun Mar 01, 2020 10:32 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Favorability
- Replies: 4
- Views: 278
Favorability
Can kinetics tell you if a reaction is favorable or not? And if so, how?
- Sun Mar 01, 2020 10:29 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic and Voltaic Cells
- Replies: 7
- Views: 483
Re: Galvanic and Voltaic Cells
They are synonymous. However, we do need to know the difference between a galvanic and electrolytic cell; galvanic converts chemical energy into electrical energy and an electrolytic cell turns electrical energy into chemical energy.
- Sun Mar 01, 2020 10:25 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics in Test 2?
- Replies: 13
- Views: 786
Kinetics in Test 2?
We're not going to be tested on kinetics in test 2 right?
- Sun Feb 23, 2020 10:25 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: cell diagrams Pt
- Replies: 2
- Views: 104
Re: cell diagrams Pt
You need a solid to act as an electrode and Pt is an effective and common one bc it is resistant to oxidation, so if there is no solid we just assume it is Pt
- Sun Feb 23, 2020 10:23 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Vant Hoff Equation
- Replies: 9
- Views: 699
Vant Hoff Equation
What do we need to know about the Vant Hoff equation? Like will we need to ever calculate it? And what concepts about the equation should we know?
- Sun Feb 23, 2020 10:17 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Platinum
- Replies: 4
- Views: 271
Re: Platinum
I looked it up and i found "Platinum is used in electrochemical cells because it is resistant to oxidation- it will not easily react, which makes in excellent as an electrode as it will not take part in the Redox reactions occurring in electrochemical cells."
- Sun Feb 23, 2020 10:13 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: | divider in cell diagram
- Replies: 5
- Views: 332
Re: | divider in cell diagram
Yes, I believe they were both aqueous so you wouldn't separate them with a 'I'
- Sun Feb 23, 2020 10:12 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridge vs. Porous Disk
- Replies: 2
- Views: 215
Re: Salt Bridge vs. Porous Disk
I think the only important difference for us to know is that when you write cell diagrams you put one 'I' between the anode and cathode for a disk and 'II' when there's a salt bridge between them
- Sun Feb 23, 2020 10:10 pm
- Forum: Van't Hoff Equation
- Topic: Thermo in Test 2
- Replies: 6
- Views: 398
Thermo in Test 2
What of thermodynamics do we need to know for test 2?
- Sun Feb 23, 2020 10:07 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: STP
- Replies: 13
- Views: 706
STP
Does anyone know what values we assume if told something happens under STP?
- Sun Feb 23, 2020 9:58 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Calculation of Eo of a cell
- Replies: 3
- Views: 247
Re: Calculation of Eo of a cell
I think what equation you'd use would depend on what info the question provides
- Sun Feb 23, 2020 9:56 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration and Cell Potential
- Replies: 5
- Views: 2888
Re: Concentration and Cell Potential
You relate these two with the Nernst equation: E=E*-RT/nF x lnQ. (the * is a knot, I just can't find one on my keyboard) So, if Q (concentration) increases then the term RT/nF x lnQ increases meaning you subtract a larger amount from E* and E is smaller. So I believe concentration and cell potential...
- Sun Feb 23, 2020 9:52 pm
- Forum: Balancing Redox Reactions
- Topic: Test 2
- Replies: 9
- Views: 510
Test 2
Does anyone know what day our test 2 get pushed back to?
- Sun Feb 09, 2020 11:19 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Equations not on eq sheet
- Replies: 1
- Views: 82
Equations not on eq sheet
Does anyone know what equations we will need to know on the midterm that won't be on the formula sheet?
- Sun Feb 09, 2020 11:13 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isothermal
- Replies: 9
- Views: 501
Isothermal
Does isothermal mean the same thing as reversible?
- Sun Feb 09, 2020 8:09 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Cs for monoatomic and diatomic
- Replies: 4
- Views: 195
Re: Cs for monoatomic and diatomic
Monatomic compounds are composed of single atoms, and diatomic compounds are composed of molecules containing two atoms. what-are-the-seven-diatomic-elements-606623-v3-5b562dab46e0fb0037fee8c7.png Difference-Between-Monatomic-and-Diatomic-Comparison-Summary.png I don't know why the C s values are 3...
- Sun Feb 09, 2020 8:02 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Entropy in reversible reactions
- Replies: 2
- Views: 81
Entropy in reversible reactions
In the midterm review today Matthew said that S(sys)=-S(surr) when a process is reversible, but how do S(sys) and S(surr) relate when a process is irreversible?
- Sun Feb 09, 2020 7:58 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs Free Energy on midterm
- Replies: 5
- Views: 283
Gibbs Free Energy on midterm
Since we did not finish all the Gibbs free energy topics is the only equation we need to know for the midterm G=H-TS?
- Sun Feb 09, 2020 7:51 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Cs for monoatomic and diatomic
- Replies: 4
- Views: 195
Cs for monoatomic and diatomic
What does mono and diatomic mean and why are the Cs for them 3/2R and 5/2R?
- Sat Feb 08, 2020 4:41 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Reversible vs Irriversible
- Replies: 3
- Views: 162
Reversible vs Irriversible
Can anyone explain what makes an expansion reversible versus irreversible?
- Tue Feb 04, 2020 12:29 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Heat vs Temp
- Replies: 3
- Views: 200
Heat vs Temp
Can anybody explain the difference between heat and temperature?
- Tue Feb 04, 2020 12:28 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Extensive Property
- Replies: 4
- Views: 275
Extensive Property
What does it mean when someone says something is an extensive property? Like how is heat capacity an extensive property and specific heat capacity is not?
- Tue Feb 04, 2020 12:18 am
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Lyndon's Step Up 2/3
- Replies: 1
- Views: 185
Lyndon's Step Up 2/3
I had to leave early from Lyndon's step-up today, does anyone have the answers to the worksheet?
- Tue Feb 04, 2020 12:16 am
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Reversible Reactions
- Replies: 1
- Views: 55
Reversible Reactions
Can anybody explain what it means for a reaction to be reversible/irreversible?
- Sun Jan 26, 2020 8:09 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: enthalpy changes
- Replies: 2
- Views: 54
Re: enthalpy changes
I doubt we will, that would suck, but maybe ask your TA for confirmation
- Sun Jan 26, 2020 8:05 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Reversible Reactions
- Replies: 3
- Views: 230
Re: Reversible Reactions
I think technically all reactions can be reversible when put under certain conditions, but if you mean when we double-arrow a reaction I believe it is because it doesn't fully dissociate or the reverse reaction is likely to occur
- Sun Jan 26, 2020 8:00 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: exo thermic
- Replies: 11
- Views: 344
Re: exo thermic
In an exothermic reactant you can treat heat like a product so if you "added product" (increased heat) the equilibrium would shift left towards the reactants
- Sun Jan 26, 2020 7:59 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: percent ionization
- Replies: 5
- Views: 170
Re: percent ionization
Because you are subtracting a very minuscule amount from a much larger initial amount so the subtraction becomes negligible. Like if I have $10,000 and I give away $1 I would basically still have $10,000.
- Wed Jan 22, 2020 8:25 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6B.9 (a)
- Replies: 3
- Views: 87
Re: 6B.9 (a)
The [H3O+] is 1.5M
- Wed Jan 22, 2020 8:24 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6B.9 (a)
- Replies: 3
- Views: 87
6B.9 (a)
For this problem I keep taking the -log of [H3O+] to find the pH and getting -0.176 but the answer book says it's +0.176, what am I doing wrong?
- Thu Jan 16, 2020 1:30 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Inert Gas and Le Chatliers
- Replies: 7
- Views: 221
Inert Gas and Le Chatliers
Why does adding an inert gas not effect an equation?
- Thu Jan 16, 2020 1:28 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K units
- Replies: 10
- Views: 479
Re: K units
I think it's because K is an activity and activities don't have units.
- Wed Jan 15, 2020 9:52 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6D.3
- Replies: 1
- Views: 41
6D.3
Can anybody explain how to do 6D.3?
- Wed Jan 15, 2020 9:35 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6B.9
- Replies: 1
- Views: 51
6B.9
Can anyone help me with the first two rows of 6B.9?
- Wed Jan 15, 2020 9:28 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Negative pH
- Replies: 2
- Views: 97
Negative pH
What does it mean if a pH is negative?
- Wed Jan 15, 2020 9:07 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: When to use Kc or Kp
- Replies: 2
- Views: 79
When to use Kc or Kp
When am i supposed to use Kc rather than Kp and vice versa? Because i heard that you use Kp for gasses but in an example problem during one of the step-ups we used Kc for an equation with just gasses.
- Wed Jan 15, 2020 9:03 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Inert Gas
- Replies: 5
- Views: 139
Inert Gas
What is an inert gas?
- Wed Jan 15, 2020 9:00 pm
- Forum: Ideal Gases
- Topic: ICE tables
- Replies: 9
- Views: 1446
Re: ICE tables
I think it would depend on the information given in the question (concentration or pressure). The units for pressure are usually atm or bar.
- Wed Jan 15, 2020 8:58 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Kb and Ka
- Replies: 2
- Views: 141
Re: Kb and Ka
Ka x Kb = 10^-14 so if you have Kb and are asked to find Ka then you do 10^-14/Kb.
I am not sure how to find the pH though.
I am not sure how to find the pH though.
- Wed Jan 15, 2020 8:57 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE tables
- Replies: 4
- Views: 104
Re: ICE tables
I think you use ICE tables when you're given K and an initial concentration and are asked to find a final concentration.
- Sat Dec 07, 2019 3:58 pm
- Forum: Lewis Acids & Bases
- Topic: 6.21
- Replies: 2
- Views: 164
6.21
On question 6.21 in the textbook why can't the Oxygen on the Thymine accept protons?
- Sat Dec 07, 2019 3:48 pm
- Forum: Lewis Acids & Bases
- Topic: 6.5
- Replies: 1
- Views: 95
6.5
Can anyone explain 6.5 part c from the textbook?
- Sat Dec 07, 2019 10:56 am
- Forum: Hybridization
- Topic: N-triple bond-N pi bond hybridization
- Replies: 4
- Views: 217
Re: N-triple bond-N pi bond hybridization
(N2p, N2p) because pi bonds happen when p orbitals overlap. does this mean that pi bonds can only be formed in p orbitals only? Yeah i'm pretty sure by definition pi bonds form between the overlapping of p orbitals. There could be exceptions I don't know of but when you look it up it says overlappi...
- Sat Dec 07, 2019 10:54 am
- Forum: Lewis Structures
- Topic: Priority of factors when drawing Lewis structures
- Replies: 4
- Views: 617
Re: Priority of factors when drawing Lewis structures
I'm not sure but I know that having an octet is the most important thing when drawing lewis structures and then usually from making sure each atom has an octet you can figure out how to best balance the formal charges. What if there is more than one way to make all atoms have eight electrons? Then ...
- Sat Dec 07, 2019 12:53 am
- Forum: Hybridization
- Topic: N-triple bond-N pi bond hybridization
- Replies: 4
- Views: 217
Re: N-triple bond-N pi bond hybridization
(N2p, N2p) because pi bonds happen when p orbitals overlap.
- Sat Dec 07, 2019 12:50 am
- Forum: Naming
- Topic: Naming Anionic Ligands
- Replies: 3
- Views: 231
Re: Naming Anionic Ligands
Either will work, but on Dr. Levelle's pdf the ones in the starred column are what he will usually use i believe.
- Sat Dec 07, 2019 12:47 am
- Forum: Sigma & Pi Bonds
- Topic: Characteristics
- Replies: 2
- Views: 284
Re: Characteristics
I think you could relate it to chelating ligands because a ligand cant create a ring around a metal if it cant rotate meaning it would have to have the right type of bond (single vs double) in the right places.
- Sat Dec 07, 2019 12:43 am
- Forum: Naming
- Topic: oxidation number
- Replies: 3
- Views: 197
Re: oxidation number
I'm pretty sure it can get up tp 6.
- Sat Dec 07, 2019 12:37 am
- Forum: Naming
- Topic: Parentheses in naming
- Replies: 1
- Views: 173
Re: Parentheses in naming
I thought that polydentate ligands were put in parentheses when there is multiple of them and that explains 9C.4 but not 9C.3 so i'm confused too
- Sat Dec 07, 2019 12:34 am
- Forum: Hybridization
- Topic: 2s for Carbon hybridization
- Replies: 3
- Views: 261
Re: 2s for Carbon hybridization
On a test though when writing out hybridization i think it doesn't matter if you write the 2 in front as long as the sp^2 part is correct.
- Sat Dec 07, 2019 12:33 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelation
- Replies: 4
- Views: 322
Re: Chelation
Chelation is when a polydentate ligand forms a ring around its central atom. All polydentate ligands are said to be chelating.
- Sat Dec 07, 2019 12:30 am
- Forum: Lewis Structures
- Topic: Priority of factors when drawing Lewis structures
- Replies: 4
- Views: 617
Re: Priority of factors when drawing Lewis structures
I'm not sure but I know that having an octet is the most important thing when drawing lewis structures and then usually from making sure each atom has an octet you can figure out how to best balance the formal charges.
- Sat Dec 07, 2019 12:23 am
- Forum: Naming
- Topic: writing formula of a given name
- Replies: 5
- Views: 385
Re: writing formula of a given name
At the review session we were told that when going from name to formula the order of the ligands does not matter.
- Sat Dec 07, 2019 12:21 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Place
- Replies: 3
- Views: 289
Re: Final Exam Place
14A-1, 10am class: Last name A-L in CS 50.
Last name M-Z in Lakretz 110.
14A-3, 12noon class: Last name A-G in CS 24.
Last name H-M in CS 76.
Last name N-Z in Franz 1178.
14A-4, 2pm class: Last name A-Z in Moore 100.
Last name M-Z in Lakretz 110.
14A-3, 12noon class: Last name A-G in CS 24.
Last name H-M in CS 76.
Last name N-Z in Franz 1178.
14A-4, 2pm class: Last name A-Z in Moore 100.
- Sat Dec 07, 2019 12:14 am
- Forum: Lewis Acids & Bases
- Topic: Stronger Base and Stronger Acid
- Replies: 3
- Views: 250
Re: Stronger Base and Stronger Acid
For acids you look at either:
1. Bond length
2. Resulting anion stability.
i'm not sure about bases though
1. Bond length
2. Resulting anion stability.
i'm not sure about bases though
- Sat Dec 07, 2019 12:13 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelate vs Polydentate
- Replies: 6
- Views: 206
Re: Chelate vs Polydentate
Chelates form a ring around the central atom, whereas polydentate ligands allow more than one of its binding sites to be occupied. I think that a polydentate ligand can be a chelate, but they are not necessarily a chelate. In the review session i'm pretty sure Matthew said all polydentate ligands c...
- Sat Dec 07, 2019 12:12 am
- Forum: Polyprotic Acids & Bases
- Topic: Definition of Polyprotic
- Replies: 5
- Views: 592
Re: Definition of Polyprotic
Polyprotic acids can donate more than one proton and polyprotic bases can accept more than one proton. For example, H2SO4 is a polyprotic acid and its conjugate base SO4^2- would be a polyprotic base.
- Sat Dec 07, 2019 12:06 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: EDTA
- Replies: 3
- Views: 314
Re: EDTA
It's hexadentate and it is also a chelating ligand.
- Sat Dec 07, 2019 12:06 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelate vs Polydentate
- Replies: 6
- Views: 206
Re: Chelate vs Polydentate
Chelates form a ring around the central atom, whereas polydentate ligands allow more than one of its binding sites to be occupied. I think that a polydentate ligand can be a chelate, but they are not necessarily a chelate. In the review session i'm pretty sure Matthew said all polydentate ligands c...
- Sat Dec 07, 2019 12:04 am
- Forum: Identifying Acidic & Basic Salts
- Topic: Basic Salts
- Replies: 2
- Views: 203
Re: Basic Salts
If one of the ions in a salt comes from a weak acid or base then the salt will change the pH.
- Wed Nov 27, 2019 1:25 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Acid/base strength?
- Replies: 4
- Views: 402
Re: Acid/base strength?
A strong acid or base will completely dissociate in water, leading to a higher concentration of [H+] or [OH-] in the solution which contributes to a more extreme pH or pOH.
- Wed Nov 27, 2019 1:22 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acids
- Replies: 13
- Views: 1519
Re: Acids
Probably the 7 main strong & weak acids he went over in class, and we will probably have to know bases too, but i'm sure Dr. Lavelle will tell us as we get closer to the final.
- Wed Nov 27, 2019 1:21 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: How to take the log to get the pH?
- Replies: 8
- Views: 441
Re: How to take the log to get the pH?
If you were given a Hydrogen concentration of [H+]=0.1M, for example, and asked to find the pH, you would plug the concentration into the formula pH=-log[H+]; pH=-log[0.1M], and just plug it into your calculator.
- Wed Nov 27, 2019 1:16 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis acid vs regular acid?
- Replies: 4
- Views: 293
Re: Lewis acid vs regular acid?
They are the same thing but the definition of an Acid can be defined as both a Lewis Acid (accepts e- pair) or Bronstead Acid (proton donor).
- Wed Nov 27, 2019 1:13 pm
- Forum: Dipole Moments
- Topic: Hydrogen Bonding Sites
- Replies: 9
- Views: 533
Re: Hydrogen Bonding Sites
Any site where a Hydrogen atom bonds to a Nitrogen, Oxygen, or Fluorine atom.
- Mon Nov 25, 2019 4:15 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination compound
- Replies: 5
- Views: 177
Re: Coordination compound
I believe they are all just synonyms of each other
- Mon Nov 25, 2019 4:13 pm
- Forum: Lewis Acids & Bases
- Topic: Proton acceptor and proton donor?
- Replies: 33
- Views: 2040
Re: Proton acceptor and proton donor?
The proton acceptor is the Bronstead Base/ e- pair donator (Lewis Base), and the proton donor is the Bronstead Acid/ e- pair acceptor (Lewis Acid).
- Mon Nov 25, 2019 4:10 pm
- Forum: Air Pollution & Acid Rain
- Topic: Clean Coal vs Dirty Coal?
- Replies: 16
- Views: 1392
Re: Clean Coal vs Dirty Coal?
Clean coal contains more carbon and less sulfur meaning it is better or "cleaner" for the environment whereas dirty coal is the opposite.
- Mon Nov 25, 2019 4:09 pm
- Forum: Bronsted Acids & Bases
- Topic: Weak vs Strong Acid/Bases
- Replies: 3
- Views: 186
Re: Weak vs Strong Acid/Bases
I think it would be a weak acid/base still because the definition of a strong acid/base is it completely ionizes in water, so I would assume that if an acid or base did not completely ionize in water, even if it did for a notable percentage, it would still be a weak one just because it does not fit ...
- Mon Nov 25, 2019 4:05 pm
- Forum: Student Social/Study Group
- Topic: A joke to brighten your day
- Replies: 3
- Views: 174
Re: A joke to brighten your day
Heres a joke for you too:
Ya'll wanna hear a joke about chemistry or Na?
Ya'll wanna hear a joke about chemistry or Na?
- Mon Nov 25, 2019 1:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs linear
- Replies: 56
- Views: 4057
Re: Bent vs linear
Linear has no lone electrons so it would be AX but a bent shape has a lone pair so it would be AXE.
- Sat Nov 16, 2019 12:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T Shape
- Replies: 7
- Views: 501
Re: T Shape
If he never went over it in the lecture i'd read it in the textbook just in case.
- Sat Nov 16, 2019 12:51 pm
- Forum: General Science Questions
- Topic: Test 2
- Replies: 7
- Views: 364
Re: Test 2
Since Test 2 will only be on topics covered in the last 3 lectures i'd assume it's going to be mainly concept based.
- Sat Nov 16, 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: Test 2
- Replies: 5
- Views: 259
Re: Test 2
According to an email from my TA test 2 will include: -Use the Valence-Shell Electron-Pair Repulsion Model (VSEPR) to determine the shape of inorganic, organic, and small biological molecules, cations, and anions. -Use bond dipole moments and shape to determine if a molecule is polar or non-polar. -...
- Fri Nov 15, 2019 5:59 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma & Pi Bonds
- Replies: 4
- Views: 246
Re: Sigma & Pi Bonds
We are going over Sigma & Pi bonds on Monday 11/18.
- Thu Nov 07, 2019 7:10 pm
- Forum: Photoelectric Effect
- Topic: Midterm 1
- Replies: 9
- Views: 655
Re: Midterm 1
Emily_4B wrote:Do you guys know if we’ll get the midterm back or be able to look at it in office hours to review this question?
My TA went over the midterm during discussion so maybe yours will too.
- Thu Nov 07, 2019 7:08 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bond Strength
- Replies: 12
- Views: 1036
Re: Bond Strength
Ionic because the electronegativity difference between the two atoms in an ionic bond are usually greater than the electronegativity difference between atoms in covalent bonds.
- Thu Nov 07, 2019 7:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: Why is the ionization energy of nitrogen higher than that of oxygen's?
- Replies: 11
- Views: 894
Re: Why is the ionization energy of nitrogen higher than that of oxygen's?
Nitrogen has symmetry in it's 2p orbital (1 e- in each sub shell) and no electron-electron repulsion whereas Oxygen has one more electron than Nitrogen meaning its 2px orbital has electron-electron repulsion so its easier to ionize the fourth electron in the 2p orbital.
- Thu Nov 07, 2019 6:44 pm
- Forum: Lewis Structures
- Topic: Expanded Octet
- Replies: 10
- Views: 472
Re: Expanded Octet
If they have a d orbital they can expand their octet
- Thu Nov 07, 2019 6:42 pm
- Forum: General Science Questions
- Topic: Week 6 homework problems
- Replies: 7
- Views: 501
Re: Week 6 homework problems
I think this week we covered topic 2D
- Sat Nov 02, 2019 6:05 pm
- Forum: Trends in The Periodic Table
- Topic: Ionic radius
- Replies: 2
- Views: 99
Re: Ionic radius
According to the textbook, the atomic radius is half the distance between the centers of neighboring atoms and the ionic radius is the contribution of an ion to the distance between neighboring ions in a solid ionic compound. You can find out which isoelectronic ion has a larger radius by taking nuc...
- Sat Nov 02, 2019 5:53 pm
- Forum: Octet Exceptions
- Topic: Cl as an expanded octet
- Replies: 3
- Views: 130
Re: Cl as an expanded octet
Since Cl is in the third period it can hold electrons in its d shell (3d) and form an expanded octet. I googled it and found the example: ClF3
- Sat Nov 02, 2019 5:48 pm
- Forum: Lewis Structures
- Topic: Expanded Valence Shells
- Replies: 3
- Views: 120
Re: Expanded Valence Shells
When atoms have d shells they can hold more than 8 electrons
- Sat Nov 02, 2019 5:47 pm
- Forum: Trends in The Periodic Table
- Topic: Period Trends
- Replies: 11
- Views: 507
Re: Period Trends
Atomic radius
- Sat Nov 02, 2019 5:45 pm
- Forum: Electronegativity
- Topic: What is isoelectronic?
- Replies: 13
- Views: 723
Re: What is isoelectronic?
Atoms are isoelectronic when they have the same number of electrons. For example, N2-, O-, and F are isoelectronic.
- Thu Oct 24, 2019 6:17 pm
- Forum: Lewis Structures
- Topic: Ion lewis structure
- Replies: 9
- Views: 363
Re: Ion lewis structure
I don't think it matters, as long as you follow the octet rule and put the bracket and the ion's respective charge around the lewis structure.