## Search found 62 matches

Sun Mar 17, 2019 12:47 am
Forum: Ideal Gases
Topic: K and Q
Replies: 8
Views: 502

### 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: 525

### 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: 338

### 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: 324

### 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: 244

### 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: 250

### 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: 91

### 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: 250

### 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: 3
Views: 162

### 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: 137

### 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: 463

### 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: 214

### 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: 107

### 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: 187

### 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: 138

### 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: 119

### 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: 218

### 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: 106

### 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: 82

### 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: 604

### 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: 938

### 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: 645

### 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)
Sun Jan 27, 2019 9:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6A19 part c
Replies: 1
Views: 112

### 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: 280

### 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: 141

### 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: 138

### 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: 162

### Re: ICE calculation sig figs

Sun Jan 20, 2019 11:03 pm
Forum: Ideal Gases
Topic: Chemistry Community Posting
Replies: 7
Views: 265

### 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: 221

### 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
Sun Jan 13, 2019 9:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Effect of increased concentration on equilibrium
Replies: 9
Views: 791

### 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: 405

### 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)
Sun Dec 09, 2018 11:20 pm
Forum: DeBroglie Equation
Topic: DeBroglie Units
Replies: 3
Views: 387

### 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: 4495

### 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: 528

### 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: 712

### 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
Sun Dec 02, 2018 10:36 pm
Forum: Naming
Topic: Naming
Replies: 2
Views: 83

### 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: 827

### 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: 458

### 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: 304

### 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: 155

### 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: 155

### 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: 1086

### 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: 4335

### 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: 190

### 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: 102

### London Forces

Why does every molecule have London forces?
Sun Nov 11, 2018 9:34 pm
Forum: Trends in The Periodic Table
Replies: 6
Views: 519

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: 267

### 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: 973

### 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.
Sun Nov 04, 2018 11:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: N, L, and ML
Replies: 1
Views: 296

### 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: 469

### 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: 234

### 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: 68

### 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: 369

### 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: 137

### 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: 95

### 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: 174

### 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: 1935

### 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: 762

### 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: 571

### 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: 24884

### 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.
Mon Oct 08, 2018 10:13 am
Forum: SI Units, Unit Conversions
Topic: What is the notation for molar mass?
Replies: 15
Views: 1234

### 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: 131

### 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?