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Physical Chemistry
Explore questions in the Physical Chemistry category that you can ask Spark.E!
- What is the mass of 0.75 mol of hydrogen molecules (relative formula mass = 2.0)?
- How many carbon atoms are there in 12.0 g of carbon-12?
- For an acid/conjugate base pair, the sum of pka and pkb always equals 14 at 25C
- Our assumption that partial pressure of a gas equals the activity of the gas is only valid for gases at high pressure
- Entropy increases with decreasing temperature and decreasing volume
- The Henderson-Hasselbalch equation for buffers is only valid at high salt concentrations
- LeChatelier's Principle explains why equilibrium constants can sometimes change with the addition of more reagents
- The second law of thermodynamics states that the entropy of an isolated system must increase for any spontaneous process
- A process is spontaneous if it has a tendency to occur without being driven by external influence
- Entropy increases with condensation and freezing
- The mole fraction in the vapor above a binary mixture of liquids is related to the mole fraction in the liquid but is not necessarily the same
- At equilibrium, the change in S(total) = 0
- Polyprotic acids, although they can lose more than one proton, only have one stoichiometric point
- One assumption that concentration equals activity is not true at high concentrations
- The neutralization of an acid by adding an equal number of moles of a base always results in a solution at pH 7
- If one removes products as they are formed, all of the reactants can be made to react
- Reaction quotients, like equilibrium constants, only change due to temperature
- Salts from deprotonated strong acids do not affect the pH of a solution
- The reaction stops when equilibrium is reached
- At equilibrium, change(G) is less than or equal to 0