C3 Testing for salts and gases

How do you test for carbon dioxide gas?

• Turns limewater milky
• Relights a glowing splint
• Makes a squeaky pop with a splint
• Bleaches damp litmus paper

How do you test for oxygen gas?

• Makes a squeaky pop with a lit splint
• Relights a glowing splint
• Bleaches damp litmus paper
• Turns limewater milky

Li+ produces what colour flame?

• Yellow
• Green
• Lilac
• Orange

The best test for oxygen is that

• it relights a glowing spling

• it relights a burning splint

• it changes lime water to milky

• it makes a glowing splint go out

Carbon dioxide can be tested by using

• a glowing splint

• a burning splint

• hydrogencarbonate indicator

• lime water

A burning splint burns longer in unbreathed air than in breathed air. This shows that

• Breathed air has more carbon dioxide.

• Breathed air has less oxygen.

• Breathed air has more water vapour.

• Breathed air has more noble gases.