CHEMISTRY COMMUNITY

Melodie Oh 2A

It's because the [A]=1/60[A0] meaning that 1/[A] would be 1/1/60[A0] which becomes 16/[A0]

Melodie Oh 2A

How do you know the difference between a catalyst and in intermediate in a reaction mechanism??

Melodie Oh 2A

Sometimes it can also include halogen, nitrogen or oxygen.

Melodie Oh 2A

How do you know when an elementary reaction is slow or fast?

Melodie Oh 2A

For the reaction of Pt(s)|H2(g)|HCl(aq)|Hg2Cl2(s)|Hg(l), it becomes Hg2Cl(s) + H2(g) --> 2Hg(l) + 2Cl-(aq) + 2H+(aq).

What does the Pt stand for and why isn't it included in the reaction equation?

Melodie Oh 2A

What exactly is the difference between heat and enthalpy??

Melodie Oh 2A

How can there be 6 orientations for the molecule SO2F02?

Melodie Oh 2A

Because the units cancel out in the ratio, the unit doesn't really matter. You just have to make sure that the units of the two volume or pressure are the same.

Melodie Oh 2A

Whenever a temperature is lowered, the exothermic process is favored so yes, the formation of the product will be favored. I would say that the favorability of the product or reactant when the temperature changes depend on what type of a reaction it is (endothermic or exothermic).

Melodie Oh 2A

I was reading the textbook and I wasn't too sure on the concept of Clausius inequality. How exactly does deltaS >q/T work if the equation that are given to us are deltaS=q/T?

Melodie Oh 2A

Why does the equation of entropy change for change in volume use V2/V1 while it is P1/P2 for the change in pressure?

Melodie Oh 2A

It doesn't really matter but usually entropy is in J/K due to the equation of S=q/T

Melodie Oh 2A

I read the textbook and I still don't really understand the concept of reversible and irreversible expansion. What exactly are the difference between the two in terms of the work??

Melodie Oh 2A

This is because bond enthalpies uses the average bond, and doesn't take the intermolecular forces into account.

Melodie Oh 2A

This will depend on the c value that you have. If you have the molar heat capacity and the second equation will be used and if you have the specific heat capacity the first one will be used.

Melodie Oh 2A

You basically take the negative of the enthalpy of fusion/vaporization if the process is in reverse.

Melodie Oh 2A

Can someone explain why the value for work is positive when it is compression and why it is negative when it is expansion??

Melodie Oh 2A

Open system has transfer of heat and material; closed system has transfer of heat but not the transfer of material; isolated system has no transfer of heat or material.

Melodie Oh 2A

I'm still confused about the molar heat capacity. How can the specific heat capacity for gas change depending on the value of volume or pressure?

Melodie Oh 2A

In lecture today, we learned how to use bond enthalpy to calculate ΔH. Just to clarify, does it mean that ΔH= ∑bond broke - ∑bond formed?

Melodie Oh 2A

So basically, the temperature wouldn't change because that heat is required to change the phase. The temperature would stay constant until the phase transitions and then it would start changing its temperature if more heat is given/lost.

Melodie Oh 2A

Whenever the enthalpy is negative it is an exothermic reaction as it means that it RELEASES that amount of energy rather than absorbing it.

CHEMISTRY COMMUNITY

Search found 22 matches

Re: 15.35

Catalyst and Intermediate

Re: The symbol R

Elementary Reaction

Example 14.4

Heat and Enthalpy

9.25 Question

Re: Pressure and Volume

Re: Exothermic and decrease in tempterature

Clausius inequality

Change of Entropy for V and T

Re: units conversion for entropy

Reversible vs Irreversible

Re: Bond Enthalpies

Re: Calculating heat (q)

Re: enthalpy of fusion/vaporization

Work for compression/expansion

Re: Is there a way specific way to approach into seeing if open closed or isolated?

Molar heat capacity

Bond Enthalpies

Re: Heat and Phase Transition

Re: Exothermic reaction in bond enthalpy example in lecture