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Applicable to questions about heat, energy, work, and their interconversion in chemistry. See the tag wiki for a detailed list of topics. Questions tagged may also be tagged with [enthalpy], [energy], [free-energy] where appropriate.

2
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1answer
One description of the concept is that heat of reaction (exothermic) is the quantity of heat that would given off to the surrounding by the product of a reaction if we allow the product to cool down. …
asked Oct 26 '14 by most venerable sir
0
votes
1answer
Can anyone describe the process through which we determine the heat capacity of calorimeter, for me? The formula is $q_{calorimeter} = C_{calorimeter} \times \Delta T$ The heat of bomb calorimeter …
asked Nov 2 '14 by most venerable sir
3
votes
1answer
All things in nature tells us that high entropy is easier to happen. But then why does it takes energy to break bonds, in order to achieve high entropy. Any thing in gaseous state has higher potentia …
asked Sep 28 '14 by most venerable sir
0
votes
1answer
So my textbook gives me this random equation: $\Delta U = q + w$. Then consider two conditions, under constant pressure and under constant volume. Because $w = -P\Delta V$, constant volume will make …
asked Mar 29 '15 by most venerable sir
7
votes
2answers
$$H=U+pV$$ Above is the formula for enthalpy or the sum of the internal energy and pressure volume product. $-p\Delta V$ is work done by or on the system. But $pV$, yet very similar to work, I think …
asked Nov 2 '14 by most venerable sir
7
votes
2answers
I can think of any other way to influence the value of $\Delta G$ than (1) change the temperature (2) providing an external source to overcome the negative cell potential The relationship between $\D …
asked Apr 7 '15 by most venerable sir
2
votes
2answers
To generalize the problem, I will just say: 5 gram of impure ethanol (or any other type of combustible material) is placed inside a bomb calorimeter where volume is constant. If the combustion pro …
asked Nov 13 '14 by most venerable sir
7
votes
1answer
This is what I read on Chemwiki: Rudolf Clausius was a German physicist, and he developed the Clausius statement, which says "Heat generally cannot flow spontaneously from a material at a lower te …
asked Mar 29 '15 by most venerable sir
6
votes
1answer
Why is the standard enthalpy of formation of $\ce{O2}$ and other reference forms of elements equal to zero? Well, from what I know, bonding releases energy. Also, does anybody know a source for find …
asked Oct 27 '14 by most venerable sir
0
votes
1answer
Is there a way to prove that $\frac{1}{2} mv^2 $$= \frac{3}{2}RT$ The first one is kinetic energy and the second is the average kinetic energy. Can this be proved by component of velocity.
asked Oct 10 '14 by most venerable sir
4
votes
1answer
There are two separate experiments done in this problem. First experiment 106.6 gram of water at 23.28 C and 8.56 gram of sodium sulfate places into a foam cup (a calorimeter) the temperature to 2 …
asked Jan 3 '15 by most venerable sir