Tests for Hydrogen, Oxygen, Carbon Dioxide and Chlorine Flashcards

1️⃣ Familiarise yourself with the flashcards:

  • Look through all the flashcards to see what's on both sides.
  • Make sure you understand the information on each card. If something's unclear, click the link to the revision notes at the bottom of the page for more details.

2️⃣ Test yourself:

  • Look at the question or prompt on each card and try to remember the answer before flipping it over.
  • Check the answer and make a note of any cards you find challenging and need to go over more.

3️⃣ Consistently Review and Practice:

  • Use spaced repetition: spend more time on the cards you struggle with and go over them more often.
  • Regularly review all the flashcards to help you better understand and retain the information over time.

Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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How do you test if a gas is hydrogen?

Put a lit splint at the mouth of the test tube of gas.

What positive result shows hydrogen gas is present?

You hear a squeaky pop when the gas burns.

How do you test if a gas is oxygen?

Put a glowing splint into the test tube of gas.

What positive result shows oxygen gas is present?

The glowing splint relights.

How do you test if a gas is carbon dioxide?

Bubble the gas through clear limewater.

What positive result shows carbon dioxide gas is present?

The limewater turns cloudy or milky.

How do you test if a gas is chlorine?

Hold damp blue litmus paper in the gas.

What positive result shows chlorine gas is present?

The damp blue litmus paper turns red, then is bleached white.

Why must litmus paper be damp when testing for chlorine gas?

The chlorine must dissolve in water on the paper so it can react and bleach it.

A gas is bubbled through limewater and it turns milky. Which gas is it?

Carbon dioxide.