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WorksheetsG11 Chemistry Revision
Total questions: 21
Worksheet time: 23mins
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
One difference between real gases and ideal gases is that ideal gases may be liquefied when
they are cooled, and pressure is applied to them
True
False
Dalton’s law states that the rate of effusion of a gas is inversely proportional to the square
root of its molar mass.
True
False
Effusion is the escape of gas through a small hole in a container.
True
False
(a) is the tendency of a gas to move toward areas of lower concentrations until the
concentration is uniform throughout.
Hydrogen bonding between water molecules explains water’s (a) boiling point.
Particles in a mixture of gases at the same temperature have the same ________ _____.
(a)
Oxygen has a (a) electronegativity than hydrogen.
______ _____ between water molecules contribute to its high surface tension.
(a)
A mixture of gases at a total pressure of 145.0 kPa contains N2, CO2, and O2. The partial pressure
of the N2 is 28.5 kPa, and the partial pressure of the CO2 is 76.0 kPa.
What is the partial pressure of the O2 (show your work)
How many grams of CO2 would be contained in 8.0 L at 152 kPa and 27°C?
(Molar mass of C=12g/mol, O=16g/mol)
The separation of uranium-235 from uranium -238 has been carried out using gaseous diffusion.
Calculate the relative rates of diffusion of gaseous UF6 containing these isotopes.
Molar mass of UF6 containing uranium-235 = 349.0 amu.
Molar mass of UF6 containing uranium-238 = 352.0 amu
(Show your work)
