Physical Chemistry Questions
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