Chem 20 - Gases: Complete Unit

At constant temperature, as volume of a gas sample increases, pressure will _____________

• increase

• decrease

• not change

At constant pressure, as temperature of a gas sample increases, volume will __________________

• an increase

• a decrease

• no change

With respect to gases, pressure can be described as

• The average force with which gas molecules hit an object

• The area over which a force acts divided by the total force

• The force exerted by a gas particles divided by the surface area over which they act

• The weight of a gas acting on the object

A bicycle tire with a fixed volume of 800 mL gets warmer when it is taken out of the garage and placed in the sun. The tire’s temperature changed from 15 ⁰C in a garage to 50⁰C in the sun. If the tire pressure was recorded to be 28 psi in the garage, what should be its pressure in the sun?

• 93 psi

• 31 psi

• 25 psi

• 8.4 psi

A helium balloon has an initial pressure and volume of 120 kPa and 5.00L at 20 ⁰C. The balloon is taken on an airplane and placed in the plane’s wheel compartment. If the balloon has a volume of 5.50 L and a pressure of 94.2 kPa while it is travelling in wheel compartment, what is the temperature of the wheel compartment?

• - 20 ⁰C

• - 17 ⁰C

• 17 ⁰C

• 20 ⁰C

Tags

NGSS.HS-PS3-4

Boyle's Law only works if which measurement(s) below is(are) held constant? (choose ALL that apply)

• Pressure of the gas

• Temperature of the gas

• Amount of Gas

• Volume of the gas

In which law(s) do you find an inversely proportional relationship between variables? (choose ALL that apply)

• Boyle's

• Charles'

• Guy-Lussac's

• Avogadro's

Which statement best describes the Law of Combining Volumes?

• Equal volumes of gas at the same T and P have equal amounts of gas

• The volumes of gas involved in a reaction, when measured at the same T and P, will occur in simple, whole number ratios.

• It's a conversion ratio that can be used to convert between volume and amount of a gas at either STP or SATP conditions

• The total volume of a gas sample is equal to the individual volumes of the components that make up the gas sample

What would be the volume of 3.25 moles of butane gas under SATP conditions?

• 80.6 L

• 72.8 L

• 0.145 L

• 0.131 L

What would be the mass of 10.0 L of CH₄(g) under STP conditions?

• 6.47 g

• 7.17 g

• 14.0 g

• 360 g