CHEM 105 EXAM 4 QUESTIONS AND ANSWERS
Describe the relationship between acid strength and electrolyte strength - CORRECT ANSWER✅✅strong
acids=strong electrolytes
weak acids=weak electrolytes
Write an example of an acid based solution - CORRECT ANSWER✅✅acid + base --> salt + water
HCl + NaOH --> NaCl + H20
What does a coffee cup calorimeter measure? - CORRECT ANSWER✅✅Change in H at constant
pressure
What does a bomb calorimeter measure? - CORRECT ANSWER✅✅Change in E at constant volume
Describe the properties of a strong acid - CORRECT ANSWER✅✅complete ionization in solution
Describe the properties of a weak acid - CORRECT ANSWER✅✅partial ionization in solution
What is the first law of thermodynamics? - CORRECT ANSWER✅✅law of conservation of energy:
neither created nor destroyed
Define oxidation, reduction, oxidizing agent, and reducing agent. - CORRECT ANSWER✅✅Oxidization:
loss of e- <-- reducing agent
Reduction: gain of e- <-- oxidizing agent
What does deltaE mean and what is its formula? - CORRECT ANSWER✅✅Change in internal energy
DeltaE = atw
What does q mean and what is its formula? - CORRECT ANSWER✅✅Heat
q=mcdeltaT
, what does w mean and what is its formula? - CORRECT ANSWER✅✅work
w=-pdeltav
A system RELEASING HEAT to the surrounding has what sign of q? - CORRECT ANSWER✅✅negative
A system GAINING HEAT to the surrounding has what sign of q? - CORRECT ANSWER✅✅positive
A system DOING WORK on the surroundings has what sign of w? - CORRECT ANSWER✅✅negative
Work BEING DONE ON the system has what sign of w? - CORRECT ANSWER✅✅positive
List examples of STRONG acids - CORRECT ANSWER✅✅HCl
HNO3
HBr
HClO4
H2SO4
HI (?)
List examples of WEAK acids - CORRECT ANSWER✅✅HF
HC2H3O2
What is the oxidation number of the chromium atom in Na2CrO4? - CORRECT ANSWER✅✅+6
What is the oxidation number of N in NaNO3? - CORRECT ANSWER✅✅+5
Determine the oxidization number in Se of SeO4^-2 - CORRECT ANSWER✅✅+6
Describe the relationship between acid strength and electrolyte strength - CORRECT ANSWER✅✅strong
acids=strong electrolytes
weak acids=weak electrolytes
Write an example of an acid based solution - CORRECT ANSWER✅✅acid + base --> salt + water
HCl + NaOH --> NaCl + H20
What does a coffee cup calorimeter measure? - CORRECT ANSWER✅✅Change in H at constant
pressure
What does a bomb calorimeter measure? - CORRECT ANSWER✅✅Change in E at constant volume
Describe the properties of a strong acid - CORRECT ANSWER✅✅complete ionization in solution
Describe the properties of a weak acid - CORRECT ANSWER✅✅partial ionization in solution
What is the first law of thermodynamics? - CORRECT ANSWER✅✅law of conservation of energy:
neither created nor destroyed
Define oxidation, reduction, oxidizing agent, and reducing agent. - CORRECT ANSWER✅✅Oxidization:
loss of e- <-- reducing agent
Reduction: gain of e- <-- oxidizing agent
What does deltaE mean and what is its formula? - CORRECT ANSWER✅✅Change in internal energy
DeltaE = atw
What does q mean and what is its formula? - CORRECT ANSWER✅✅Heat
q=mcdeltaT
, what does w mean and what is its formula? - CORRECT ANSWER✅✅work
w=-pdeltav
A system RELEASING HEAT to the surrounding has what sign of q? - CORRECT ANSWER✅✅negative
A system GAINING HEAT to the surrounding has what sign of q? - CORRECT ANSWER✅✅positive
A system DOING WORK on the surroundings has what sign of w? - CORRECT ANSWER✅✅negative
Work BEING DONE ON the system has what sign of w? - CORRECT ANSWER✅✅positive
List examples of STRONG acids - CORRECT ANSWER✅✅HCl
HNO3
HBr
HClO4
H2SO4
HI (?)
List examples of WEAK acids - CORRECT ANSWER✅✅HF
HC2H3O2
What is the oxidation number of the chromium atom in Na2CrO4? - CORRECT ANSWER✅✅+6
What is the oxidation number of N in NaNO3? - CORRECT ANSWER✅✅+5
Determine the oxidization number in Se of SeO4^-2 - CORRECT ANSWER✅✅+6
