Gas Collection Methods and Properties

This lesson explains how to collect gases based on their density. Gases less dense than air, like helium, rise and are collected using upward delivery, while denser gases, like carbon dioxide, are collected via downward delivery. If the gas's density is unknown, it can be collected over water, provided it is insoluble. Hydrogen chloride, being soluble, is collected using downward delivery. A gas syringe can be used to collect any gas, regardless of its density or solubility, and is useful for measuring gas volume.

Why do some balloons float while others do not?

• Because of the color of the balloon

• Due to the material of the balloon

• Due to the density of the gas inside

• Because of the size of the balloon

Which gas is typically found in balloons that float?

• Nitrogen

• Oxygen

• Carbon Dioxide

• Helium

What is the method called for collecting gases that are less dense than air?

• Water displacement

• Upward delivery

• Downward delivery

• Gas syringe method

Which of the following gases can be collected using upward delivery?

• Chlorine

• Hydrogen

• Carbon Dioxide

• Oxygen

How are gases more dense than air collected?

• Over water

• Upward delivery

• Using a gas syringe

• Downward delivery

Which gas is collected using downward delivery?

• Hydrogen

• Chlorine

• Ammonia

• Helium

What is a limitation of collecting gases over water?

• It is only used for measuring gas volume

• It only works for gases denser than water

• It is not suitable for gases soluble in water

• It can only collect gases lighter than air

Why can't hydrogen chloride be collected over water?

• It dissolves in water

• It is more dense than air

• It is insoluble in water

• It is less dense than air

What is a benefit of using a gas syringe for gas collection?

• It is only for gases denser than air

• It is only for gases lighter than air

• It is only for gases insoluble in water

• It can measure the volume of gas

Which method can be used to collect any gas regardless of its properties?

• Downward delivery

• Gas syringe

• Upward delivery

• Over water