Search found 49 matches

by Jasmine W 1K
Thu Mar 12, 2020 6:50 pm
Forum: Ideal Gases
Topic: Kc vs Kp
Replies: 43
Views: 448

Re: Kc vs Kp

Kp is used with gases and Kc is used when you are dealing with concentrations.
by Jasmine W 1K
Thu Mar 12, 2020 6:49 pm
Forum: Ideal Gases
Topic: R Constant
Replies: 26
Views: 269

Re: R Constant

It depends on the units given in the problem. All of the R constants mean the same thing; the numbers just change due to unit conversions.
by Jasmine W 1K
Thu Mar 12, 2020 6:48 pm
Forum: Ideal Gases
Topic: reversing reactions
Replies: 14
Views: 142

Re: reversing reactions

K is inversed so it becomes 1/K.
by Jasmine W 1K
Thu Mar 12, 2020 6:47 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Units
Replies: 8
Views: 99

Re: Units

yes. the units for rate is always concentration (M) over time (s)
by Jasmine W 1K
Sun Mar 08, 2020 5:05 pm
Forum: First Order Reactions
Topic: rate constants
Replies: 19
Views: 189

Re: rate constants

Rate constants are always positive because concentrations cannot be negative.
by Jasmine W 1K
Sun Mar 08, 2020 5:04 pm
Forum: Zero Order Reactions
Topic: third order
Replies: 11
Views: 436

Re: third order

No, we are not covering third order reactions.
by Jasmine W 1K
Sun Mar 08, 2020 5:04 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: units of k
Replies: 9
Views: 77

Re: units of k

for zero-order reactions, K has units of M/s
for first-order reactions, K has units of 1/s
for second-order reactions, K has units of 1/M.s
by Jasmine W 1K
Sun Mar 08, 2020 5:02 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: units of T
Replies: 11
Views: 372

Re: units of T

It is usually best to use the standard units if nothing is specified.
by Jasmine W 1K
Sun Mar 08, 2020 5:01 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: determine n
Replies: 16
Views: 529

Re: determine n

n represents the order of the reactants.
by Jasmine W 1K
Sun Mar 08, 2020 5:00 pm
Forum: General Rate Laws
Topic: the variable A
Replies: 4
Views: 25

Re: the variable A

A is the frequency factor or pre-exponential factor. It includes the number of collisions with the correct orientation.
by Jasmine W 1K
Sun Mar 08, 2020 4:59 pm
Forum: General Rate Laws
Topic: integrated rate laws
Replies: 7
Views: 67

Re: integrated rate laws

The rate law is a differential equation that only considers the initial rate, while the integrated rate laws can be used to discover how quickly a reaction has progressed over a certain amount of time.
by Jasmine W 1K
Sun Mar 08, 2020 4:56 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: instantaneous rate
Replies: 16
Views: 124

Re: instantaneous rate

The instantaneous rate is more precise because it isn't an average.
by Jasmine W 1K
Sun Mar 08, 2020 4:55 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: derivations
Replies: 9
Views: 92

Re: derivations

In lecture, Dr. Lavelle went over the derivations for the first, second, and zeroeth order rate laws and their half-life reactions. He did not go over the derivation for the Arrhenius equation though.
by Jasmine W 1K
Sun Mar 08, 2020 4:46 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: kinetically stable?
Replies: 10
Views: 97

Re: kinetically stable?

It is thermodynamically spontaneous because delta G is negative, but it won't proceed normally because it has such a high activation energy.
by Jasmine W 1K
Sun Mar 08, 2020 4:44 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: units
Replies: 11
Views: 91

Re: units

It is usually mol per L per unit of time, which is usually in seconds.
by Jasmine W 1K
Sun Mar 01, 2020 6:50 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing/reducing agent
Replies: 18
Views: 154

Re: Oxidizing/reducing agent

I think of it in terms of opposites, so whatever is being oxidized acts as the reducing agent and whatever is being reduced acts as the oxidizing agent.
by Jasmine W 1K
Sun Mar 01, 2020 5:07 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Metal dissolution
Replies: 10
Views: 305

Re: Metal dissolution

The metal that becomes an ion is the one that dissolves in the solution. Also, most reactions would identify it as dissolved by using (aq).
by Jasmine W 1K
Sun Mar 01, 2020 5:05 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Activation Energy
Replies: 16
Views: 521

Re: Activation Energy

Activation energy is the minimum amount of energy required to begin the reaction. In an energy diagram, it is the highest peak on the energy graph.
by Jasmine W 1K
Sun Mar 01, 2020 5:03 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: intermediate
Replies: 22
Views: 591

Re: intermediate

An intermediate is formed and used up during the reaction, so it will not be included in the rate law because it isn't part of the overall reaction.
by Jasmine W 1K
Sun Mar 01, 2020 5:02 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: how can you tell
Replies: 11
Views: 108

Re: how can you tell

Reactions with short reaction times are usually controlled by kinetics, while reactions with longer reaction times are usually controlled by thermodynamics.
by Jasmine W 1K
Sun Mar 01, 2020 4:59 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Units for delta G
Replies: 14
Views: 195

Re: Units for delta G

The unit would be kJ.
by Jasmine W 1K
Sun Mar 01, 2020 4:59 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Where to find Ecell values
Replies: 15
Views: 119

Re: Where to find Ecell values

It can be found in Appendix 2B at the back of the book!
by Jasmine W 1K
Sun Mar 01, 2020 4:58 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: delta G = -nFE
Replies: 6
Views: 66

Re: delta G = -nFE

The negative is to make sure that when E is positive, delta G will be negative, meaning that the reaction would be spontaneous.
by Jasmine W 1K
Sun Mar 01, 2020 4:56 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: finding n
Replies: 6
Views: 62

Re: finding n

Adriana_4F wrote:What happens if the number of electrons transferred is different? Do you have to balance the equation to make it the same?


Yes, you would have to balance the half-reactions so that the number of electrons transferred is the same.
by Jasmine W 1K
Sun Mar 01, 2020 4:55 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Flipping the sign
Replies: 10
Views: 65

Re: Flipping the sign

E is usually given for reduction reactions. When you need to find E for an oxidation reaction, you flip the sign for the equivalent reduction half-reaction.
by Jasmine W 1K
Sun Mar 01, 2020 4:54 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell diagram order
Replies: 3
Views: 29

Re: cell diagram order

The order of the cell diagram depends on state, not the order of the reaction, so it should be s|g|aq||aq|g|s.
by Jasmine W 1K
Sun Mar 01, 2020 4:53 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cells
Replies: 6
Views: 30

Re: Galvanic Cells

Galvanic cells are spontaneous, so E has to be positive.
by Jasmine W 1K
Sun Mar 01, 2020 4:51 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: C(gr) state
Replies: 4
Views: 32

Re: C(gr) state

C(gr) refers to carbon in the form of graphite.
by Jasmine W 1K
Sun Mar 01, 2020 4:50 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 10
Views: 49

Re: Salt Bridge

The purpose of the salt bridge is to maintain electrical neutrality between the cathode and anode to keep the cell from reaching equilibrium too quickly.
by Jasmine W 1K
Sun Mar 01, 2020 4:50 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: salt bridge
Replies: 11
Views: 48

Re: salt bridge

The purpose of the salt bridge is to maintain electrical neutrality between the cathode and anode to keep the cell from reaching equilibrium too quickly.
by Jasmine W 1K
Sun Mar 01, 2020 4:48 pm
Forum: Balancing Redox Reactions
Topic: Reducing/Oxidizing Agents
Replies: 13
Views: 65

Re: Reducing/Oxidizing Agents

I think of it in terms of opposites, so whatever is being oxidized acts as the reducing agent and whatever is being reduced acts as the oxidizing agent.
by Jasmine W 1K
Sun Mar 01, 2020 4:47 pm
Forum: Balancing Redox Reactions
Topic: When to add H+ or H20
Replies: 19
Views: 183

Re: When to add H+ or H20

In an acidic solution, you can use both H+ and H2O to balance the equation. In an acidic solution, You can add H2O to balance the oxygen first, and then H+ to balance the hydrogens. In a basic solution, you can add OH- to balance the oxygens and then add H2O to balance the hydrogens.
by Jasmine W 1K
Sun Mar 01, 2020 4:44 pm
Forum: Balancing Redox Reactions
Topic: H+ or H2O
Replies: 9
Views: 88

Re: H+ or H2O

You can use both H+ and H2O to balance redox reactions when they occur in acidic solutions.
by Jasmine W 1K
Sun Mar 01, 2020 4:43 pm
Forum: Balancing Redox Reactions
Topic: Cell Diagrams
Replies: 14
Views: 84

Re: Cell Diagrams

In a cell diagram, the anode would be on the left and the cathode would be on the right, separated by || (the salt bridge).
by Jasmine W 1K
Sun Mar 01, 2020 4:42 pm
Forum: Balancing Redox Reactions
Topic: Acidic and Basic solutions
Replies: 11
Views: 87

Re: Acidic and Basic solutions

In an acidic solution, you can balance it using H2O and H+, while in a basic solution, you can balance it using H2O and OH-.
by Jasmine W 1K
Thu Feb 20, 2020 5:46 pm
Forum: Balancing Redox Reactions
Topic: oxidizing and reducing agents
Replies: 3
Views: 28

oxidizing and reducing agents

For this reaction, would Cl2 be both the oxidizing and reducing agent?

Reaction of chlorine in water:
Cl 2 (g) --> HClO(aq) + Cl-
by Jasmine W 1K
Thu Feb 20, 2020 4:44 pm
Forum: Balancing Redox Reactions
Topic: Homework problem 6K.1
Replies: 5
Views: 54

Re: Homework problem 6K.1

Start by identifying the oxidized and reduced species. The oxidation number for Cr changes from +6 to +3, indicating reduction (gain of 3 electrons). The oxidation number for C changes from -2 to -1, indicating oxidation (loss of 1 electron). You now have the skeleton for your half-reactions: (Cr2O...
by Jasmine W 1K
Thu Feb 20, 2020 4:42 pm
Forum: Balancing Redox Reactions
Topic: Test 2 [ENDORSED]
Replies: 12
Views: 127

Re: Test 2 [ENDORSED]

Test 2 has been postponed to week 9 starting on Tuesday during discussion sections.
by Jasmine W 1K
Thu Feb 20, 2020 12:29 pm
Forum: Balancing Redox Reactions
Topic: oxidation numbers
Replies: 5
Views: 39

oxidation numbers

Do you have to figure out the oxidation numbers of all of the parts of the reaction in order to figure out which parts are oxidized and which are reduced?
by Jasmine W 1K
Thu Feb 20, 2020 12:28 pm
Forum: Balancing Redox Reactions
Topic: oxidation numbers
Replies: 3
Views: 33

oxidation numbers

In an equation, if the oxidation number of one of the elements decreases, is that a way to see if it is reduced? Same question for if the oxidation number increases, would it be oxidized?
by Jasmine W 1K
Thu Feb 20, 2020 12:27 pm
Forum: Balancing Redox Reactions
Topic: oxidation numbers
Replies: 8
Views: 51

oxidation numbers

Is the oxidation number just the charge? If not, how do you find the oxidation number?
by Jasmine W 1K
Thu Feb 20, 2020 12:13 pm
Forum: Balancing Redox Reactions
Topic: Homework problem 6K.1
Replies: 5
Views: 54

Homework problem 6K.1

The following reaction is used in the acidic solution in the Breathalyzer test to determine the level of alcohol in the blood: H+(aq) + (Cr2O7)-2(aq) + C2H5OH(aq) ---> (Cr)3+(aq) + C2H4O(aq) + H2O(l) I need help figuring out how to get a balanced redox equation by writing the balanced oxidation and ...
by Jasmine W 1K
Mon Feb 10, 2020 11:39 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: delta U = q + w
Replies: 6
Views: 52

delta U = q + w

In this equation: delta U = q + w, how would you know whether or not work would be positive or negative?
by Jasmine W 1K
Mon Feb 10, 2020 11:38 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: delta U = q + w
Replies: 3
Views: 38

delta U = q + w

In this equation: delta U = q + w, how would you know whether or not q would be positive or negative?
by Jasmine W 1K
Thu Jan 23, 2020 12:33 pm
Forum: Ideal Gases
Topic: solids and K
Replies: 8
Views: 73

solids and K

I am confused about why we don't include the solids when calculating K because they are included within the reaction.
by Jasmine W 1K
Thu Jan 23, 2020 12:31 pm
Forum: Ideal Gases
Topic: ICE table approximation
Replies: 10
Views: 71

ICE table approximation

How do you know whether you can use the approximation shortcut rather than the quadratic equation for problems involving ICE tables?
by Jasmine W 1K
Thu Jan 09, 2020 12:19 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs. Q
Replies: 10
Views: 89

Re: K vs. Q

K is the equilibrium constant, while Q is the reaction quotient and can, therefore, be used at any time during the reaction. This means that Q can be calculated even when the reaction is not at equilibrium, leading to K and Q possibly being different numbers. by comparing the different values of K a...
by Jasmine W 1K
Thu Jan 09, 2020 12:06 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G.1C
Replies: 3
Views: 48

5G.1C

c) If one starts with a higher pressure of reactant, the equilibrium constant will be larger.
I don't really understand why this is false, because I thought that pressure affects the equilibrium constant for gases. Can someone please explain why this is false?

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