Chemistry: Precision and Design Chapter 5 Test

Front

What is the value of the universal gas constant, R?

Back

8.314 L·kPa/(K·mol)

Front

What is the SI unit of pressure?

Back

pascal

Front

Are absorbance and concentration directly or inversely proportional? What pattern does the equation A / c = k follow?

Back

directly proportional; x = ky

Front

Alice is standing 2 m from a sealed container containing two gases, A and B. Gas B has twice the molar mass of gas A. The container is opened, allowing the gases to diffuse. Which gas will reach Alice first?

Back

Gas A arrives first.

Front

What is the name for the process of mixing molecules of one substance through another substance by random molecular motion?

Back

Diffusion

Front

What is the pressure of a gas at STP?

Back

100 kPa

Front

What term refers to a type of gas that exactly obeys the assumptions of the kinetic theory?

Back

Ideal gas

Front

Why does the volume of a gas increase when heated, according to the kinetic theory of matter?

Back

The kinetic energy of gas molecules is directly related to temperature.

Front

When an effervescent tablet is dropped into water, the resulting reaction produces gaseous carbon dioxide. Suppose someone drops an effervescent tablet into a container half-filled with water and then immediately seals the container. Will the pressure of the gas inside the container increase or decrease if the temperature is kept constant? Why?

Back

Increase; P and n are directly related at constant T and V.

Front

Which laboratory instrument is most similar to a device that measures pressure using a stretchy material sealed over a jar, with a straw taped horizontally to indicate pressure changes?

Back

Aneroid barometer; pressure is measured by volume changes of a sealed container.