Properties of Gases

Gases can be defined by the following statement:

• a.Gases freely flow to fill the container they are in.
• b.Gases have neither a defined volume nor shape.
• c.Gases are highly compressible.
• d.All of the above

The relationships between the following four variables are known as the gas laws.

• a.pressure (P), depth (D, in cm), temperature (T), and amount (n, in moles)
• b.pressure (P), volume (V), temperature (T), and amount (n, in moles)
• c.height (H, in cm), volume (V), temperature (T), and amount (n, in moles)
• d.pressure (P), volume (V), length (L, in cm), and amount (n, in moles)

Gas molecules are incredibly far apart and often interact with each other.

• a.false
• b.true

The scientific principle that, so long as temperature is kept constant, the volume (V) of a fixed amount of gas is inversely proportional to its pressure (P) is called:

• a.Boyles's Law
• b.Charles's Law
• c.Avogadro's Law
• d.Ideal Gas Equation

The scientific principle that states that when pressure is kept constant, a fixed amount of gas increases its volume as its temperature increases is known as:

• a.Boyle’s Law
• b.Charles's Law
• c.Avogadro's Law
• d.Ideal Gas Equation

In 1811, Avogadro put forth a hypothesis stating that

• a.Atoms combine in whole-number ratios to form molecules.
• b.Gases increase their volume in the same amount when their temperature is increased by the same degree.
• c.Equal volumes of different gases have different numbers of molecules.
• d.Equal volumes of different gases have an equal number of molecules.

Suppose you have two identical birthday balloons, with one filled with the gas helium and the other blown up by you. Assuming they’re both filled to the same amount, these balloons will have the same number of molecules.

• a.true
• b.false

When real gases are chilled to very low temperatures, they exert a(n) _____ amount of pressure in a container as compared to an ideal gas.

• a.greater
• b.equal
• c.lesser
• d.phase change