# Questions tagged [physical-chemistry]

The study of chemical systems using the laws and concepts of physics. This usually requires the techniques of thermodynamics, statistical mechanics and quantum mechanics.

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### Find change in pressure for a van der waal gas [closed]

You are given $\pu{1 mol}$ of a Van der Waal gas and you have the volume change from $\pu{10 l}$ to $\pu{9 l}$ and the temperature changed from $\pu{273.15K}$ to $\pu{274K}$. Find $\Delta P$.
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### Is there a way to theoretically estimate the overpotential losses in a battery?

Me and my team are currently designing a battery and are looking to do some pre-experimental analysis of different battery chemistries based on their overpotential losses. I am aware of the Butler ...
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### Can Na2S + H2SO4 react to give Na2SO4 + H2O? [closed]

Can $\ce{Na2S + H2SO4}$ react to give $\ce{Na2SO4 + H2O}$ or $\ce{Na2O + H2O + SO2}$? In my textbook, it has been given that the product will be $\ce{NaOH + H2O + SO2}$. Can also the other two ...
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### How does current start to flow when galvanic cell is first connected?

Using the Daniell Cell as an example, where in the steady state we expect zinc to be oxidised and copper to be reduced spontaneously due to the overall reduction in Gibbs free energy, how does the ...
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### The Curious Case of the equivalent weight

Please read the reference points given at the end. I understand the following about equivalent weight. Firstly it is given by, $Equivalent\:Weight= \frac{Molar\:Weight}{Valence\:Factor}$ And secondly, ...
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### Determine if stuff is Potassium Alum

How can one determine (at home) if the product shown below is Potassium Alum? I held a piece of it in a gas flame (assuming that the flame would become violet if potassium were present), but there was ...
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### Effect of adding pure solid/liquid in heterogenous equilibrium

QUESTION Consider the following reaction as an example: $$\ce{NaNO3(s) <=> NaNO2(s) + 1/2O2(g)}$$ Once this reaction has achieved equilibrium and then if we added pure $\ce{NaNO3}$ to this ...
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### Without attractive forces, why would there be only ideal gases? [closed]

I've read this statement in several places. What is the importance of attractive forces for solids and liquids?
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### Experiment to demonstrate Dalton's Law of Multiple Proportions

Is there an experiment that I can do in the lab with middle or high school students to demonstrate Dalton's Law of Multiple proportions ? For example, the reaction of $\ce{C}$ and $\ce{O2}$ to give \$\...
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### Why is the units of rate constant dependent on the order of the reaction?

In many textbooks, it is written that For order (m + n), the rate constant, k has units of mol1−(m+n)·L(m+n)−1·s−1 However, by the Arrhenius equation, k can be expressed as k = PZexp(-Ea/RT) and ...
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### Can carbon dioxide be reduced to carbon monoxide and oxygen to produce energy?

There are lots of questions about reducing or burning CO2 to carbon and oxygen to solve climate change, but of course that wouldn't work because it takes a lot of energy. But carbon monoxide is more ...