CHEMISTRY COMMUNITY

Wenting Hu 2H

Can someone explain part c to me? Why does raising temperature increase the rate constant of the reaction with the higher activation barrier?

Wenting Hu 2H

Update: the answer book is wrong. It's 0.008314, not 0.08314. So it is equal to 0.59

Wenting Hu 2H

Wait but i get 0.059 instead of 0.59? It that just me?

Wenting Hu 2H

What does it mean to draw a proposed structure for the activated complex?

Wenting Hu 2H

how do you do 15.63? The rate constant of the reaction between CO2 and OH in aqueous solution to give the HCO3 ion is 1.5 x10^10 L*mol^1s^1 at 25 C. Determine the rate constant at blood temperature (37 C), given that the activation energy for the reaction is 38 kJ/mol. I don't get how to set up t...

Wenting Hu 2H

Are reaction rates always positive?

Wenting Hu 2H

Just to clarify for part b, hypothetically, if it were a second order reaction and H2 concentration doubled, then the initial rate would quadruple right?

Wenting Hu 2H

Hi can someone explain the difference between the functions of the relative rate law equation and the differential rate law?

Wenting Hu 2H

What about integrated problems?

Wenting Hu 2H

What homework question should we do up to to prepare for the upcoming test if the test will only cover 15.1-15.6?

Wenting Hu 2H

Can someone explain how the book got 0.055 for the [A]t value?

Wenting Hu 2H

When cathode has a higher value than anode, it makes the E positive since E=Ecathode=Eanode. We now know that the reaction favors the products because G=-nFE. If E is positive, G is negative and therefore, the reaction will spontaneously form products.

Wenting Hu 2H

for 14.31 how do we determine if the reaction has k>1? Is it cathode/anode?

Wenting Hu 2H

Is the oxidizing agent basically just the the molecule that is being reduced (gaining electrons)? and the reducing agent the molecule that is losing electrons (oxidized)?

Wenting Hu 2H

It's because the system is doing work and because the change in internal energy is 0 at constant temperature, w=-q

Wenting Hu 2H

For 9.91, where it asks us to calculate Gibbs at various temperatures, why is the answer book using 44 kj/mol as deltaH even when the temperature isn't 25 degrees celsius? Doesn't 44 kj/mol only apply at 25 degrees?

Wenting Hu 2H

9.23 states: Which would you expect to have a higher molar entropy at T = 0, single crystals of BF3 or of COF2? Why? The answer book explains the answer as COF2 because there is more variations in bond groups to the central atom, but does it also have something to do with the double bond that COF2 h...

Wenting Hu 2H

For questions like 9.9, why is it that when you sub -w in for q under isothermal conditions, it becomes dS=+PdV/T? Shouldn't it be -PdV?

Wenting Hu 2H

For 11.99, (a) Calculate the standard Gibbs free energies of formation of the halogen atoms X(g) at 1000. K from data available in Table 11.2. (b) Show how these data correlate with the XOX bond strength by plotting the standard Gibbs free energy of formation of the atoms against the bond dissociati...

Wenting Hu 2H

I was wondering the same thing because for Table 9.2, it says 75.3 is the standard molar entropy of the water at 50 degrees C. What happened to the water at 20 degrees?

Wenting Hu 2H

I have the same question. Why is it that for the change in volume, we use R, but then for the change in temperature, we use 5/2R?

Wenting Hu 2H

Why does isothermal mean that deltaU=0?

Wenting Hu 2H

sometimes per mole means per the coefficient of each element of the equation.

Wenting Hu 2H

I believe adiabatic systems can also occur in closed systems, since even if no heat is being transferred, work can still be transferred as energy, making it a closed system.

Wenting Hu 2H

Can someone elaborate on what enthalpy exchange means? the question goes: A technician carries out the reaction 2 SO2(g) + O2(g) --> 2 SO3(g) at 25 C and 1.00 atm in a constant-pressure cylinder fitted with a piston. Initially, 0.030 mol SO2 and 0.030 mol O2 are present in the cylinder. How much e...

Wenting Hu 2H

Yes, it's on the constants and formula sheet on his website.

Wenting Hu 2H

For q(copper)= - q(water), does it matter where the negative sign is? I learned today in discussion that it did but then it doesn't make sense to me. Isn't the water gaining the heat that the copper lost? So shouldn't it be -q(copper)=q(water)?

Wenting Hu 2H

Is there a difference between adiabatic processes and isolated systems?

Wenting Hu 2H

I'm confused as well. Can someone explain?

Wenting Hu 2H

For this problem, why do we need to take into account that q reaction is equal to -q calorimeter as it states in the solutions manual?

Wenting Hu 2H

Is a calorimeter a closed or an isolated system?

Wenting Hu 2H

Just making sure, but is the final temperature of the water also the final temperature of the copper mass?

Wenting Hu 2H

What is the difference between irreversible expansion and reversible expansion?

CHEMISTRY COMMUNITY

Search found 33 matches

15.65

Re: 15.63

Re: 15.63

15.85

15.63

Reaction Rates

15.13

Relative Rates and Differential Rate Law [ENDORSED]

Re: Test 3

Test 3

15.39

Re: Reaction Favoring Products

14.31

Oxidizing/Reducing Agents

Re: Test 1 Question 3b

9.91

9.23

Derivation of isothermal entropy equations

11.99

Re: 9.43

Re: 9.13

9.9

Re: Units for Entropy

Re: Adiabatic system

8.101E

Re: Heat Capcity for Water

Re: 8.19

Adiabatic vs Isolated Systems

Re: HW Ch.8 #59 and 63

Re: 8.53

Re: Closed System

Re: Homework Problem 8.21

Re: Book 8.11 [ENDORSED]