C4.2.1 - Detecting gases

Question 1

How can you test for carbon dioxide?

Answer 1

Using limewater. Limewater turns cloudy white when carbon dioxide is bubbled through it

Question 2

How do you detect chlorine

Answer 2

• Use a drop of tap water to dampen a piece of blue litmus paper
• Hold the paper near to a container that holds the substance
• If chlorine is present the paper turns red then white

Question 3

What is limewater?

Answer 3

A calcium hydroxide solution

Question 4

How do you test for hydrogen?

Answer 4

You a place a lighted splint near the mouth of the container of the gas
- If hydrogen is present it should ignite with a squeaky pop

Question 5

How do you test for oxygen?

Answer 5

You a place a glowing splint near the mouth of the container of the gas
- If oxygen is present the splint should relight