CEM 142 EXAM WITH COMPLETE SOLUTIONS 100% VERIFIED!!!!
ALREADY GRADED A+
open system - (answer)matter can enter from or escape to the surroundings
closed system - (answer)matter is not allowed to enter or leave
isolated system - (answer)a system that can exchange neither energy nor matter with its surroundings
state function - (answer)depends only on initial and final states
path function - (answer)a property that depends on how the particular change took place
exothermic processes - (answer)ΔH is negative, the heat goes out of the system and the surroundings get
hotter
endothermic processes - (answer)ΔH is positive, heat goes into the system and the surroundings get
colder
what is the role of probability in entropy changes - (answer)entropy is the measure of the number of
possible arrangements for a given state, so the more possible arrangements, the higher the probability
of that state
second law of thermodynamics - (answer)for any change the total entropy of the universe must increase
why do we usually use delta G instead of the total entropy change to predict whether a process is
thermodynamically favorable - (answer)the second law of thermodynamics states that the entropy of
the universe is always increasing, so it will not be able to tell us if the process if favorable or not
gibbs free energy equation - (answer)ΔG = ΔH - TΔS
, CEM 142 EXAM WITH COMPLETE SOLUTIONS 100% VERIFIED!!!!
ALREADY GRADED A+
solute - (answer)minor component of a solution
solvent - (answer)major component of a solution
solvation - (answer)The process of surrounding solute particles with solvent particles to form a solution
molarity - (answer)the number of moles of solute per liter of solution
concentration - (answer)a measurement of how much solute exists within a certain volume of solvent
dilute - (answer)make (a liquid) thinner or weaker by adding water or more solvent to it
concentrated - (answer)large amount of solute
micelle - (answer)-organized cluster of amphipathic molecules
-organization is driven by the entropic factor
-polar groups will cluster together in a non polar solvent, non polar tails interact with solvent
why can't we just use entropy or energy changes to predict solubility - (answer)because temperature
plays a role in the solubility
why are non polar molecules not soluble in water - (answer)only polar molecules are soluble in water
because water is a polar molecule. water molecules rearrange to maximize the number of hydrogen
bonds they can make with the solute. a non polar solute in a polar solvent would require a lot of energy
to break the LDF's and dipole dipole interactions but the molecules in the solute and solvent are only
able to make LDF's with each other (because they both aren't polar) which releases very little energy. the
process won't happen because there is not enough energy to break the IMF's.
ALREADY GRADED A+
open system - (answer)matter can enter from or escape to the surroundings
closed system - (answer)matter is not allowed to enter or leave
isolated system - (answer)a system that can exchange neither energy nor matter with its surroundings
state function - (answer)depends only on initial and final states
path function - (answer)a property that depends on how the particular change took place
exothermic processes - (answer)ΔH is negative, the heat goes out of the system and the surroundings get
hotter
endothermic processes - (answer)ΔH is positive, heat goes into the system and the surroundings get
colder
what is the role of probability in entropy changes - (answer)entropy is the measure of the number of
possible arrangements for a given state, so the more possible arrangements, the higher the probability
of that state
second law of thermodynamics - (answer)for any change the total entropy of the universe must increase
why do we usually use delta G instead of the total entropy change to predict whether a process is
thermodynamically favorable - (answer)the second law of thermodynamics states that the entropy of
the universe is always increasing, so it will not be able to tell us if the process if favorable or not
gibbs free energy equation - (answer)ΔG = ΔH - TΔS
, CEM 142 EXAM WITH COMPLETE SOLUTIONS 100% VERIFIED!!!!
ALREADY GRADED A+
solute - (answer)minor component of a solution
solvent - (answer)major component of a solution
solvation - (answer)The process of surrounding solute particles with solvent particles to form a solution
molarity - (answer)the number of moles of solute per liter of solution
concentration - (answer)a measurement of how much solute exists within a certain volume of solvent
dilute - (answer)make (a liquid) thinner or weaker by adding water or more solvent to it
concentrated - (answer)large amount of solute
micelle - (answer)-organized cluster of amphipathic molecules
-organization is driven by the entropic factor
-polar groups will cluster together in a non polar solvent, non polar tails interact with solvent
why can't we just use entropy or energy changes to predict solubility - (answer)because temperature
plays a role in the solubility
why are non polar molecules not soluble in water - (answer)only polar molecules are soluble in water
because water is a polar molecule. water molecules rearrange to maximize the number of hydrogen
bonds they can make with the solute. a non polar solute in a polar solvent would require a lot of energy
to break the LDF's and dipole dipole interactions but the molecules in the solute and solvent are only
able to make LDF's with each other (because they both aren't polar) which releases very little energy. the
process won't happen because there is not enough energy to break the IMF's.
