## Search found 31 matches

Sat Mar 17, 2018 5:43 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.85 b
Replies: 1
Views: 237

### 15.85 b

Do you include the catalyst when writing the chemical equation?

write the chemical equation- Rate=k[I]2[Ar] (Products are I2 and Ar; the role of the Ar is to remove energy as the product forms.)
Sat Mar 17, 2018 5:23 pm
Forum: General Rate Laws
Topic: Test 3 Q1- Friday discussion
Replies: 2
Views: 324

### Test 3 Q1- Friday discussion

How do you determine the units of the rate constant for: Rate=k [A]/[C]
Sat Mar 17, 2018 5:22 pm
Forum: General Rate Laws
Topic: Test 3 Q3- Friday discussion
Replies: 1
Views: 350

### Test 3 Q3- Friday discussion

I got problem 3 wrong and redid it, but I am not sure if the answer I got is correct. The question is: The rate of A2 gas consumption in this reaction is constant throughout and is given as 0.550 M/s. If your reaction vessel starts with 0.45M of AC, how long will it take to get to 36.00M of AC? Reac...
Sat Mar 17, 2018 1:47 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.71
Replies: 1
Views: 139

### 15.71

Why is the OH ion a catalyst in this reaction?
Sun Mar 11, 2018 7:41 pm
Forum: Administrative Questions and Class Announcements
Topic: final length
Replies: 2
Views: 278

### final length

will the final be around the same length as the midterm?
Sun Mar 11, 2018 7:39 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: intermediates in forward and reverse rxn
Replies: 1
Views: 138

### intermediates in forward and reverse rxn

In what cases do the forward and reverse reactions have the same intermediates?
Sun Mar 11, 2018 7:27 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius eq use
Replies: 2
Views: 164

### Arrhenius eq use

How do you determine if the Arrhenius equation/theory can be used to model a reaction?
Sun Mar 04, 2018 9:00 pm
Forum: General Rate Laws
Topic: Stoichiometry coefficients
Replies: 3
Views: 244

### Stoichiometry coefficients

Can you ever determine the rate law only from the stoichiometry coefficients of a reaction?
Sun Mar 04, 2018 8:53 pm
Forum: General Rate Laws
Topic: Instantaneous Rate
Replies: 3
Views: 250

### Instantaneous Rate

What is the difference between the rate of reaction and the instantaneous rate of reaction?
Sun Mar 04, 2018 8:51 pm
Forum: Zero Order Reactions
Topic: Initial concentrations
Replies: 2
Views: 209

### Initial concentrations

Which order reactions depend on initial concentration?
Fri Feb 23, 2018 1:50 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: 14.33b homework
Replies: 3
Views: 247

### Re: 14.33b homework

In order to for Tl+ disproportionate in aqueous solution it must be both oxidized and reduced.
Fri Feb 23, 2018 1:30 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.23 part a
Replies: 1
Views: 127

### Re: 14.23 part a

Liquid Hg can also act as an electrode when it is in the equation.
Fri Feb 23, 2018 1:27 am
Forum: Balancing Redox Reactions
Topic: 14.13c
Replies: 2
Views: 207

### Re: 14.13c

I believe that either way is correct, as long as they are both part of the anode.
Fri Feb 16, 2018 12:40 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.9
Replies: 2
Views: 169

### Re: 14.9

To find the change in moles do you have to split the reaction into the 1/2 reactions and then balance them?
Fri Feb 16, 2018 12:32 am
Forum: Balancing Redox Reactions
Topic: Oxidized vs oxidizing agent
Replies: 5
Views: 273

### Oxidized vs oxidizing agent

How do you differentiate between when something is oxidized or reduced and when it is called an oxidizing agent or reducing agent?
Fri Feb 16, 2018 12:28 am
Forum: Balancing Redox Reactions
Topic: 14.5 d
Replies: 2
Views: 166

### Re: 14.5 d

I do not think there are any cases in which you start by adding OH-. You can solve this problem by adding H2O to the right side first, then adding H2O to the left side, and finally adding OH- to the right side.
Sun Feb 11, 2018 8:22 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: 9.35
Replies: 2
Views: 288

### Re: 9.35

There is an error in the solutions manual for this question, the answer should be b<(c=a).
Sun Feb 11, 2018 8:13 pm
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: monatomic ideal gasses
Replies: 2
Views: 231

### Re: monatomic ideal gasses

Yes, many elements can be monatomic in their gaseous state however noble gases are the only ones that are stable in ideal conditions.
Sun Feb 11, 2018 8:05 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: q vs delta H
Replies: 2
Views: 192

### q vs delta H

Can q and delta H always be used interchangeably or only in certain situations? For example in #9.15 in the homework q/T = delta H/T.
Thu Feb 01, 2018 4:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm format
Replies: 2
Views: 259

### Midterm format

Will the midterm follow the same format as the first test, all free response answers?
Thu Feb 01, 2018 4:19 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: sign of q
Replies: 7
Views: 445

### sign of q

When calculating entropy how do you know when qrev is negative in the equation?
Thu Feb 01, 2018 4:12 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: units conversion for entropy
Replies: 6
Views: 327

### units conversion for entropy

Does it matter whether the units for entropy are in J/K or kj/K?
Fri Jan 26, 2018 1:24 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Refresher on sig figs
Replies: 3
Views: 256

### Refresher on sig figs

Why does question #8.59 have 6 sig figs in the answer?
Fri Jan 26, 2018 12:00 am
Forum: Phase Changes & Related Calculations
Topic: Hw #8.49 standard state
Replies: 4
Views: 324

### Hw #8.49 standard state

Why can we assume that the reaction in this question is in its standard state and use 298 K and 8.314 J/Kmol in PV=nRT?
Wed Jan 24, 2018 11:52 pm
Forum: Phase Changes & Related Calculations
Topic: Hw #8.9 conversion to J [ENDORSED]
Replies: 1
Views: 139

### Hw #8.9 conversion to J[ENDORSED]

In the solution manual 1.48 L•atm is converted to joules using (8.314 J/Kmol / .08206 L•atm/Kmol). Why is that conversion factor used rather than just 101.325 J/L•atm?
Fri Jan 19, 2018 1:52 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.103
Replies: 2
Views: 145

### 8.103

In the solutions manual it uses the equation avg kinetic energy= 3/2RT, what is the R referring to? The pressure constants?
Fri Jan 19, 2018 1:43 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capcity for Water
Replies: 8
Views: 342

### Re: Heat Capcity for Water

I believe water always has a heat capacity of 4.184 J/g°C
Fri Jan 19, 2018 1:35 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: HW 8.105
Replies: 1
Views: 119

### Re: HW 8.105

After finding the heat for the water you also have to find the amount of energy needed for each photon using E=hc/ λ. After you find the energy in J/photon you divide the heat of the water by the energy of each photon to get the number of photons.
Fri Jan 12, 2018 3:34 pm
Forum: Administrative Questions and Class Announcements
Replies: 6
Views: 457

Did you resubmit it to your TA after making the corrections?
Christine Wastila 1H wrote:It's ok if you try one and get it wrong as long as you correct your answer. Last quarter, I would do my corrections in another color if needed, which earned me full credit.
Fri Jan 12, 2018 3:28 pm
Forum: Phase Changes & Related Calculations
Topic: Heat Enthalpies We Need to Know
Replies: 3
Views: 196

### Re: Heat Enthalpies We Need to Know

I think the common ones we need to know, but if there are any that are uncommon then the enthalpies will be given to us in the question.
Fri Jan 12, 2018 3:12 pm
Forum: Administrative Questions and Class Announcements