Search found 62 matches
- Sun Mar 17, 2019 12:47 am
- Forum: Ideal Gases
- Topic: K and Q
- Replies: 8
- Views: 1134
Re: K and Q
Because the concentration of solids and liquids are constant throughout the reaction.
- Sun Mar 17, 2019 12:45 am
- Forum: Zero Order Reactions
- Topic: Zero Order Reactions
- Replies: 8
- Views: 1070
Re: Zero Order Reactions
Zero order reactions have a constant rate and are independent of any changes in concentrations.
- Sun Mar 17, 2019 12:43 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: galvanic/voltaic cells
- Replies: 7
- Views: 840
Re: galvanic/voltaic cells
They're the same!
- Sun Mar 17, 2019 12:40 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: trials
- Replies: 2
- Views: 533
Re: trials
If you have a table of values (like in the video) you can see how the concentrations of each of the elements in the table and the changes in them affect the initial rate of reaction. By choosing two sets of data, you can isolate one of the elements of the reaction to compare and see the effect of on...
- Sat Mar 16, 2019 5:05 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 6N.3 7th edition
- Replies: 1
- Views: 505
6N.3 7th edition
How do you know which half reactions to use for this question?
- Sat Mar 16, 2019 5:04 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6N1 b) 7th edition
- Replies: 1
- Views: 398
6N1 b) 7th edition
Why is 6N1 b) 2e- instead of 1e- ?
- Sat Mar 16, 2019 5:02 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6M7 7th edition
- Replies: 2
- Views: 279
6M7 7th edition
How do you know which equation to use for 6M7?
- Sat Mar 16, 2019 5:02 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6M5 a) 7th Edition
- Replies: 1
- Views: 419
6M5 a) 7th Edition
How come the NO3 reaction is the cathode? Isn't it being oxidized as well?
- Sat Mar 16, 2019 5:00 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Ecell Always Positive
- Replies: 4
- Views: 1339
Ecell Always Positive
In the textbook it says that Ecell is always positive in a galvanic cell. Why is that?
- Wed Mar 13, 2019 1:48 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Adding Pt in 6L5 b)
- Replies: 2
- Views: 335
Adding Pt in 6L5 b)
Why do you add Pt in 6L5 b) and how do you know if you need to add this in any other cell diagram that you create? Also, why Pt specifically as opposed to any other element?
- Wed Mar 13, 2019 1:47 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing basic redox reactions
- Replies: 7
- Views: 889
Balancing basic redox reactions
How do you balance basic redox reactions if OH and H2O both have O in them? (as opposed to acidic where you can just use H+ and automatically balance the equations)?
- Wed Mar 13, 2019 1:45 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts
- Replies: 6
- Views: 591
Catalysts
How can you tell which is the catalyst in the reaction?
- Wed Mar 13, 2019 1:45 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: 7E5 Intermediates
- Replies: 1
- Views: 239
7E5 Intermediates
Why is OH not an intermediate in 7E5 (7th edition)?
- Wed Mar 13, 2019 1:44 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation Energies
- Replies: 3
- Views: 455
Activation Energies
What is the difference between using (T'-T/T'T) and (1/T1-1/T2) for the activation energies? The textbook talks about one, but the solutions use both in different problems.
- Wed Mar 13, 2019 1:42 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: What is an intermediate?
- Replies: 3
- Views: 414
What is an intermediate?
How can you tell what is an intermediate in a reaction?
- Wed Mar 13, 2019 1:41 pm
- Forum: General Rate Laws
- Topic: Explaining 7B.3 c) in 7th edition
- Replies: 2
- Views: 345
Explaining 7B.3 c) in 7th edition
Can someone explain this question in the 7th edition of the textbook? I don't quite understand the answer.
- Wed Mar 13, 2019 1:40 pm
- Forum: General Rate Laws
- Topic: Rate equations to know
- Replies: 5
- Views: 553
Rate equations to know
What are the rate equations that we need to know/ what will we be given?
- Wed Mar 13, 2019 1:39 pm
- Forum: General Rate Laws
- Topic: Rate law vs rate constant vs overall rate of reaction
- Replies: 1
- Views: 337
Rate law vs rate constant vs overall rate of reaction
What is the difference between rate law, rate constant, and overall rate of reaction?
- Wed Mar 13, 2019 1:38 pm
- Forum: First Order Reactions
- Topic: 0 Order vs Independent Rate?
- Replies: 1
- Views: 205
0 Order vs Independent Rate?
What does 0 order mean versus independent of rate?
- Sun Feb 03, 2019 11:09 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE table and Q
- Replies: 6
- Views: 1655
Re: ICE table and Q
For ice tables, the goal is to find out what the concentrations are at equilibrium, knowing that the reaction is at equilibrium. You calculate Q in order to find out whether or not the reaction is at equilibrium.
- Sun Feb 03, 2019 11:07 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 11
- Views: 1557
Re: Le Chatelier's Principle
If you increase the partial pressure on one side of the equation, the other side will be produced more and the reaction will shift to that side.
- Sun Feb 03, 2019 11:05 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: ICE
- Replies: 19
- Views: 1506
Re: ICE
I is for the initial concentration
C is for the change in concentration
E is for the equilibrium concentration (essentially the I plus/minus the C)
C is for the change in concentration
E is for the equilibrium concentration (essentially the I plus/minus the C)
- Sun Jan 27, 2019 9:09 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6A19 part c
- Replies: 1
- Views: 246
6A19 part c
Why is the concentration used 3.1 x 10^-3 and not just 3.1?
- Wed Jan 23, 2019 2:09 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Specific Notation
- Replies: 5
- Views: 596
Specific Notation
Does it matter whether or not when you're calculating K to use this notation [PCl5] or this notation P PCl5 ?
- Wed Jan 23, 2019 2:07 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs Kc
- Replies: 3
- Views: 294
K vs Kc
What is the difference between K and Kc as can be seen in table 5G2 in the 7th edition of the textbook? In which case would it be useful to use K and in which case is it useful to use Kc?
- Sun Jan 20, 2019 11:14 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Common Strong/Weak Acids and Bases
- Replies: 2
- Views: 275
Common Strong/Weak Acids and Bases
What are some examples of common strong/weak acids and bases that we would have to know or would be useful to know?
- Sun Jan 20, 2019 11:08 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE calculation sig figs
- Replies: 5
- Views: 471
Re: ICE calculation sig figs
You shouldn't round your answer until you are finished calculating everything
- Sun Jan 20, 2019 11:03 pm
- Forum: Ideal Gases
- Topic: Chemistry Community Posting
- Replies: 7
- Views: 633
Re: Chemistry Community Posting
It's every Sunday by 11:59, but I'm not sure that it is really stressed too much.
- Sun Jan 13, 2019 9:47 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Determining Which side is favored
- Replies: 5
- Views: 703
Re: Determining Which side is favored
If Q>K then there will be more products than reactants and therefore the reverse reaction will be favoured
If Q<K then there will be more reactants than products and therefore the forward reaction will be favoured
If Q<K then there will be more reactants than products and therefore the forward reaction will be favoured
- Sun Jan 13, 2019 9:41 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Effect of increased concentration on equilibrium
- Replies: 9
- Views: 1491
Effect of increased concentration on equilibrium
If you have already established equilibrium what will happen when you increase the concentration of the reactants?
- Thu Jan 10, 2019 2:12 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Explaining Q<K and Q>K [ENDORSED]
- Replies: 7
- Views: 2316
Explaining Q<K and Q>K [ENDORSED]
Why is it true that if Q is smaller than K there are more reactants than products and therefore the forward reaction is favoured. If there are more reactants than products, wouldn't that mean that the reverse reaction is favoured?
(Like in example 5I.11b in the textbook)
(Like in example 5I.11b in the textbook)
- Sun Dec 09, 2018 11:20 pm
- Forum: DeBroglie Equation
- Topic: DeBroglie Units
- Replies: 3
- Views: 639
DeBroglie Units
Why does the De Broglie equation use kg instead of grams?
- Sun Dec 09, 2018 11:18 pm
- Forum: Naming
- Topic: Regarding the test... [ENDORSED]
- Replies: 12
- Views: 5819
Re: Regarding the test... [ENDORSED]
Yes they are in chapter 9 if the textbook and we went over them in class.
- Sun Dec 09, 2018 11:17 pm
- Forum: Empirical & Molecular Formulas
- Topic: Empirical Formula [ENDORSED]
- Replies: 6
- Views: 918
Empirical Formula [ENDORSED]
What is the empirical formula when mass is not equal to 100?
- Sun Dec 02, 2018 10:41 pm
- Forum: Hybridization
- Topic: hybridization
- Replies: 13
- Views: 1818
Re: hybridization
One less than the electron groups that surround it (lone and bonding pairs)
2 = sp
3 = sp2
4 = sp3
5 = sp3d
6 = sp3d2
2 = sp
3 = sp2
4 = sp3
5 = sp3d
6 = sp3d2
Re: Naming
I'm pretty sure my TA said that we won't be given a list like that, however, it's not really an emphasis from this course to memorize those. She said that we'll get to know them as we use them through practice questions and that should be enough. We'll be given the cover sheet that we always get at ...
- Sun Dec 02, 2018 10:31 pm
- Forum: Sigma & Pi Bonds
- Topic: Triple bond?
- Replies: 18
- Views: 1766
Re: Triple bond?
The first bond is a sigma bond and the next two are pi bonds.
- Sun Dec 02, 2018 10:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs angular?
- Replies: 15
- Views: 1199
Bent vs angular?
What is the difference between the term bent and angular?
- Mon Nov 26, 2018 12:16 am
- Forum: Resonance Structures
- Topic: Resonance Structures Higher Energy?
- Replies: 1
- Views: 369
Resonance Structures Higher Energy?
Does a bond with a resonance structure have a higher or lower energy than a regular bond of the same type?
- Mon Nov 26, 2018 12:15 am
- Forum: Dipole Moments
- Topic: Polarizability
- Replies: 3
- Views: 326
Re: Polarizability
Just found it! The degree of covalent character increases with increasing charge density of a cation and increasing size of an anion.
- Sun Nov 25, 2018 4:29 pm
- Forum: Dipole Moments
- Topic: Polarizability
- Replies: 3
- Views: 326
Polarizability
What defines covalent character and polarizability?
- Sun Nov 18, 2018 11:34 pm
- Forum: Coordinate Covalent Bonds
- Topic: Coordinate Covalent Bond Definition
- Replies: 14
- Views: 1873
Re: Coordinate Covalent Bond Definition
A regular covalent bond takes place when two atoms share a pair of electrons, however, in a coordinate covalent bond, these two atoms share electrons that come from the same atom.
- Sun Nov 18, 2018 11:29 pm
- Forum: Ionic & Covalent Bonds
- Topic: Intra vs Intermolecular forces
- Replies: 9
- Views: 16729
Intra vs Intermolecular forces
Are intramolecular forces or intermolecular forces easier to break?
- Sun Nov 18, 2018 11:27 pm
- Forum: Dipole Moments
- Topic: London Force Times
- Replies: 3
- Views: 395
London Force Times
What is the average time a London Dispersion force will act upon 2 molecules for?
- Sun Nov 11, 2018 9:36 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: London Forces
- Replies: 2
- Views: 269
London Forces
Why does every molecule have London forces?
- Sun Nov 11, 2018 9:34 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic vs ionic radius
- Replies: 6
- Views: 971
Atomic vs ionic radius
What is the difference between ionic and atomic radius and their trends?
- Sun Nov 11, 2018 9:30 pm
- Forum: Bond Lengths & Energies
- Topic: Drawing resonance structures?
- Replies: 6
- Views: 715
Drawing resonance structures?
On tests will we be required to draw all possible resonance structures (like in IB) for a question that asks for a drawing of a structure that has resonance?
- Sun Nov 04, 2018 11:06 pm
- Forum: Einstein Equation
- Topic: Energy of photon [ENDORSED]
- Replies: 12
- Views: 1862
Re: Energy of photon [ENDORSED]
Depending on the specific variables that you have you can use either the equation:
E= hv
or
E = hc/ lambda
The second equation is just a combination of the first equation and lambda = c/v.
E= hv
or
E = hc/ lambda
The second equation is just a combination of the first equation and lambda = c/v.
- Sun Nov 04, 2018 11:01 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: N, L, and ML
- Replies: 1
- Views: 547
N, L, and ML
What are the responsibilities for the n, l and ml quantum numbers? What do they describe?
- Sun Nov 04, 2018 10:58 pm
- Forum: DeBroglie Equation
- Topic: DeBroglie Equation Units
- Replies: 4
- Views: 848
DeBroglie Equation Units
Why is the DeBroglie equation in metres instead of kilometres?
- Sun Oct 28, 2018 11:20 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Balmer, Lyman, Paschen Series
- Replies: 3
- Views: 439
Re: Balmer, Lyman, Paschen Series
The balmer series results from electron transitions between high energy levels to an energy level that has a principal quantum number that equals 2, the lyman series is the same but with a principal quantum number of 1, and the paschen series is the same but with a principal quantum number of 3.
- Sun Oct 28, 2018 11:16 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Orbital momentum vs spin momentum
- Replies: 1
- Views: 110
Orbital momentum vs spin momentum
What is the difference between orbital and spin momentum?
- Sun Oct 28, 2018 11:13 pm
- Forum: Properties of Light
- Topic: Standard Units
- Replies: 8
- Views: 810
Standard Units
What are the standard units for the wavelength equation?
- Mon Oct 22, 2018 9:14 am
- Forum: Properties of Light
- Topic: Regions of Light
- Replies: 2
- Views: 247
Regions of Light
Is it necessary to know the names for different regions of light and memorize their wavelengths like was required in the homework problems?
- Mon Oct 22, 2018 9:09 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Explaining Rydberg Equation
- Replies: 1
- Views: 226
Explaining Rydberg Equation
Why is there a - sign in front of the equation E= -hR/n^2?
- Mon Oct 22, 2018 9:08 am
- Forum: Einstein Equation
- Topic: Rydberg Equation
- Replies: 2
- Views: 396
Rydberg Equation
What is the difference between the Rydberg equation and E= -hR/(n)^2?
- Sun Oct 14, 2018 11:41 pm
- Forum: Limiting Reactant Calculations
- Topic: Percent Yield [ENDORSED]
- Replies: 13
- Views: 2903
Re: Percent Yield [ENDORSED]
Actual yield is the value that the problem will give you and is the value that you would get if you were doing an experiment (which is usually less than the theoretical value). Theoretical yield is the yield that you will need to calculate based on the mass values or molar values given to you in the...
- Sun Oct 14, 2018 11:36 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Molar Mass
- Replies: 8
- Views: 1322
Re: Molar Mass
For the element carbon for example (which is pictured here) the number 6 represents the atomic number (the number of protons in the atom) and the number 12.011 is the atomic mass of an element, which is an average of the mass of all of the isotopes of that particular element.
- Sun Oct 14, 2018 11:30 pm
- Forum: SI Units, Unit Conversions
- Topic: Sig Figs
- Replies: 8
- Views: 983
Re: Sig Figs
You just go with the values you see that have the least amount of significant figures. For example, if you have a question that involves calculations with the numbers 1.3005 and 7.69, then you would do the entire question and all the calculations without rounding until you get the answer- to which y...
- Mon Oct 08, 2018 10:18 am
- Forum: SI Units, Unit Conversions
- Topic: formula units [ENDORSED]
- Replies: 69
- Views: 32921
Re: formula units [ENDORSED]
Here's a pretty helpful flowchart I drew the other day to use whenever you try converting from a particular unit to another unit!
In order to get formula units from moles you would multiply by Avogadro's number (6.022 x 10^23) by the number of moles that you have.
Hope this helps.
In order to get formula units from moles you would multiply by Avogadro's number (6.022 x 10^23) by the number of moles that you have.
Hope this helps.
- Mon Oct 08, 2018 10:13 am
- Forum: SI Units, Unit Conversions
- Topic: What is the notation for molar mass?
- Replies: 15
- Views: 4837
Re: What is the notation for molar mass?
Yes molar mass is just a capital M which always expressed in the units g/mol. It is the mass of a substance (in grams) divided by its particular amount (in mols).
- Wed Oct 03, 2018 11:06 pm
- Forum: SI Units, Unit Conversions
- Topic: Question E3 in the textbook
- Replies: 2
- Views: 270
Question E3 in the textbook
How come you would only need 3 more atoms of At to balance with the 9 atoms of gallium? Wouldn't you need 3x as many atoms?