Gases in the atmosphere

What happens to limewater when carbon dioxide is bubbled through it?

• Turns from white to blue.

• Turns from colourless to milky.

• The carbon dioxide bubbles give a squeaky pop sound.

• It freezes.

What colour does sulfur burn in oxygen?

• Blue

• White

• Orange

• Lilac

What is the most abundant (this means lots of it) gas in Earth's atmosphere?

• Nitrogen

• Argon

• Oxygen

• Carbon Dioxide

Which gas makes up ~79% of Earth's atmosphere?

• nitrogen

• oxygen

• argon

• carbon dioxide

• methane

Answer explanation

Nitrogen makes up ~79% of Earth's atmosphere.

What is the percentage of oxygen in Earth's atmosphere?

• 0.04%

• 1%

• 21%

• 79%

• 100%

Answer explanation

The percentage of oxygen in Earth's atmosphere is 21%.

Which gas will form a white precipitate when bubbled through limewater, making the limewater turn milky?

• nitrogen

• oxygen

• argon

• carbon dioxide

Answer explanation

Carbon dioxide will form a white precipitate when bubbled through limewater, making the limewater turn milky.

Order the following statements to describe how to test for the presence of oxygen gas.

• place the glowing splint in oxygen gas

• the glowing splint will relight

• light a splint

• extinguish the splint to leave a glowing splint

Answer explanation

To test for oxygen gas: light a splint, extinguish the splint to leave a glowing splint, place the glowing splint in oxygen gas, and the glowing splint will relight.

In the modern day atmosphere, what is the approximate percentage of nitrogen?

• 0.04%

• 21%

• 78%

• 1%

What is the laboratory test for Oxygen gas?

• Puts out a glowing splint

• Makes a squeaky pop sound with a burning splint

• Relights a glowing splint

• Burns with blue color

Which gas makes up about 1% of the air?

• oxygen

• carbon dioxide

• argon

• hydrogen