Particulate nature of matter

What can be deduced about two gases that have the same relative molecular mass?

• They have the same boiling point

• They have the same number of atoms in one molecule

• They have the same rate of diffusion at room temperature and pressure

• They have the same solubility in water at room temperature

Which statement is correct?

• Although the change is not shown on the diagram, a gas can change directly to a solid

• The changes 1 and 3 involve particles moving closer together

• The changes 2 and 4 involve particles moving further apart

• The changes 3, 4 and 5 all involve the release of energy

A drop of liquid bromine is placed in the bottom of a gas jar. Brown fumes of bromine vapor slowly spread through the covered gas jar. Why does this happen?

• Bromine vapor is less dense than air

• Bromine molecules and the molecules in the air are always moving around

• Bromine molecules are smaller than the molecules in air

• Bromine molecules move faster than the molecules in air

Which property of a gas affects the rate at which it spreads throughout a laboratory?

• Boiling point

• Molecular mass

• Reactivity

• Solubility in water

An inflated balloon goes down because gas molecules can diffuse through the rubber. Four balloons are filled with different gases at the same temperature and pressure, Which balloon would go down the quickest?

• A

• B

• C

• D

Which gas is neither an element nor a compound?

• Ammonia

• Chlorine

• Air

• Carbon monoxide

A test tube containing a liquid X is placed in a beaker of boiling water. The liquid X starts to boil immediately.

What is the boiling point of liquid X?

• 100 °C

• above 100 °C

• between 0 °C and room temperature

• between room temperature and 100 °C

The table shows the boiling points of the elements found in a sample of liquid air.

Which elements would be gaseous at –190 °C?

• Argon, helium and nitrogen

• Argon, nitrogen and oxygen

• Helium, neon and nitrogen

• Helium, neon and oxygen

Which diagram represents the arrangement of particles in a gas?

• A

• B

• C

• D

Which gas diffuses at the same rate as nitrogen gas?

• Carbon dioxide

• Carbon monoxide

• Neon

• Sulfur dioxide