Question

chemistry 11 - unit 5: gases
multiple choice: record your answer on the zipgrade sheet provided. choose the most correct
answer.

1. according to charless law, what happens to the volume of a gas when its temperature

increases? (pressure and the number of moles are constant)
a. the volume decreases
b. the volume increases
c. the volume stays the same
d. the gas changes into a liquid
e. none of the above

1. avogadros hypothesis states that:

a. the pressure of a gas increases as its volume decreases (at constant temperature)
b. the volume of a gas increases as temperature increases (at constant pressure)
c. equal volumes of gasses contain equal number of particles at the same temperature
and pressure
d. the pressure of a gas is directly proportional to its temperature (at constant volume)
e. none of the above

1. which of the following pairs of variables are inversely (indirectly) proportional to each other?

a. the number of workers on a job and the time it takes to finish the job
b. the amount of food you eat and your energy levels
c. the distance traveled and the time taken at constant speed
d. the number of students and total number of chairs needed
e. all of the above are indirectly proportional to each other

1. according to gay - lussacs law, what happens to pressure of a gas when its temperature

increases? (assuming volume and moles are constant)
a. the pressure increases
b. the pressure decreases
c. the pressure stays the same
d. gas changes into a liquid
e. none of the above

1. a gas has a volume of 4.00l at a pressure of 100.0 kpa. what will the pressure be if the

volume is compressed to 2.00l. (assuming temperature and moles are constant)
a. 50.0kpa
b. 100. kpa
c. 150. kpa
d. 200. kpa
e. none of the above

Explanation:

1.

Charles's law states \(V = kT\) (\(k\) is a constant when pressure and moles are constant). When \(T\) (temperature) increases, \(V\) (volume) increases.

Avogadro's hypothesis: \(V = kn\) (\(k\) is a constant when \(T\) and \(P\) are constant), and it also means equal - volume gases at the same \(T\) and \(P\) have equal number of particles.

• For A: \(Work = Number\ of\ workers\times Time\), when work is constant, \(Number\ of\ workers\propto\frac{1}{Time}\) (inversely proportional).
• For B: Eating more food generally gives more energy (positive correlation, not inverse).
• For C: \(Distance=Speed\times Time\), at constant speed, \(Distance\propto Time\) (positive correlation).
• For D: \(Total\ chairs = Number\ of\ students\times1\) (positive correlation).

Answer:

B. The volume increases

2.