Gas and Vapours Quiz

What is the molecular weight of mercury (Hg)?

• 201 g/mol

• 150 g/mol

• 250 g/mol

• 100 g/mol

At Normal Temperature and Pressure (NTP), how much volume does 1 mole of any gas occupy?

• 25.0 L

• 24.45 L

• 22.4 L

• 30.0 L

What does ppm stand for in the context of air sampling?

• Parts per thousand

• Parts per billion

• Parts per meter

• Parts per million

Which of the following factors affects the boiling point of a chemical?

• Atmospheric pressure

• Molecular shape

• Humidity

• Color of the chemical

What is the lowest temperature at which a material can form an ignitable mixture called?

• Boiling point

• Flash point

• Vapor pressure

• Vapor density

Why is it important to collect air samples?

• To avoid using instruments

• To reduce sampling duration

• To increase air pollution

• To evaluate the effectiveness of controls

What happens to chemicals with higher vapor pressures at equal temperatures?

• They condense

• They do not evaporate

• They evaporate more quickly

• They evaporate more slowly

What is the measure of how heavy the vapor is in air called?

• Vapor pressure

• Vapor density

• Boiling point

• Flash point

Which type of sampling involves using instruments to measure concentrations directly?

• Active sampling

• Passive sampling

• Indirect sampling

• Static sampling

What is one reason to assess exposures during particular work processes?

• To avoid regulations

• To reduce costs

• To identify leaks or releases

• To increase production