G11 Chemistry Revision

Which of the following molecules would have the greatest velocity if each atom had the

same kinetic energy? (The molar mass of Br₂ =79.9; Cl₂ =70.9, NH₃=17.0.H₂=2.0g/mol)

• bromine

• chlorine

• ammonia

• hydrogen

How many moles of H₂ would be contained in 4.0 L of the gas at 202.6 kPa and 127°C?

• 89.6 mol

• 6.38 mol

• 0.24 mol

• 0.77 mol

If oxygen is being used up from a sample of air as iron rusts, what happens to the partial pressure of

oxygen in the air?

• It increases

• It stays the same.

• It decreases.

• The change cannot be determined.

Real gases differ most from an ideal gas at ____________________.

• low temperature and low pressure.

• low temperature and high pressure.

• high temperature and low pressure.

• high temperature and high pressure.

Ice floats on liquid water because its density is:

• lower than that of liquid water.

• the same as that of liquid water.

• higher than that of liquid water.

• none of the above

Surface tension is ______________.

• The inward force that tends to minimize the surface area of a liquid.

• Increased by detergents.

• Decreased by hydrogen bonding.

• All of the above

The attractions between adjacent water molecules are called_________________.

• Hydrogen bonds.

• Ionic bonds.

• Nonpolar covalent bonds.

• Polar covalent bonds.

What factor causes high water surface tension?

• Hydrogen bonds.

• Ionic bonds.

• Nonpolar covalent bonds.

• Polar covalent bonds.

Total pressure is the contribution each gas in a mixture makes to the total pressure.

• True

• False

Detergents are used in washing clothes because they reduce the surface tension of water.

• True

• False