Gas Tests 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:

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  • 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 for hydrogen gas in the lab?

Hold a lit splint at the mouth of a test tube of the gas. Hydrogen burns with a squeaky pop.

Why does hydrogen make a squeaky pop with a lit splint?

Hydrogen is flammable and burns very quickly with oxygen in the air, making a popping sound.

How do you test for oxygen gas?

Put a glowing splint into a test tube of the gas. If the splint relights, oxygen is present.

How do you test for carbon dioxide gas?

Bubble the gas through limewater. If carbon dioxide is present, the limewater turns milky or cloudy white.

What is limewater, used in the carbon dioxide test?

Limewater is a solution of calcium hydroxide in water. It turns milky when carbon dioxide is present.

How do you test for chlorine gas using litmus paper?

Hold damp blue litmus paper in the gas. Chlorine turns it red, then bleaches it white.

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

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

How do you test for ammonia gas using litmus paper?

Hold damp red litmus paper in the gas. Ammonia turns the red litmus paper blue.

Why must the litmus paper be damp when testing for ammonia?

The ammonia gas must dissolve in the water on the paper so its alkaline nature can change the colour.

Which gas relights a glowing splint, and what does this show?

Oxygen relights a glowing splint. This shows that the gas is oxygen.