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5.3Chemistry 02. Properties Of Materials

Use tests to identify hydrogen, carbon dioxide and oxygen gases — Cambridge Checkpoint Science 0893 Revision Notes & Topical Questions

5 min read 7 parts Lesson 3 of 9 1 quiz

📚 Cambridge Checkpoint Science 0893 Hub / Topical Revision
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Lesson summary

5.3 Tests for hydrogen, carbon dioxide and oxygen — CHECKPOINT - Lower Secondary Science 0893 notes: Use tests to identify hydrogen, carbon dioxide and oxygen gases and know how each gas is made.GasTestPositive resultHydrogenHold a lit splint at the mouth of the test tubeSqueaky …

  • Eye protection
  • Keep apart
  • Glowing splint
  • Collect the gas in a test tube
  • Hold a lit splint at the mouth of the tube
  • A squeaky pop shows hydrogen

Section 1 of 7Test for hydrogen

Test for hydrogen
Collect the gas in a test tube.
Hold a lit splint at the mouth of the tube.
A squeaky pop shows hydrogen.
Cause
  • Cause hydrogen burns rapidly with oxygen in the air to make water.
Source
  • Source hydrogen forms when a reactive metal reacts with an acid, such as magnesium with hydrochloric acid.

Section 2 of 7Test for carbon dioxide

Test for carbon dioxide
Collect the gas or bubble it directly into limewater.
Shake the limewater with the gas.
If the limewater turns cloudy, the gas is carbon dioxide.
Source
  • Source carbon dioxide forms when a carbonate reacts with an acid, such as calcium carbonate with hydrochloric acid.
Breath
  • Breath expired air contains more carbon dioxide than inspired air, so it turns limewater cloudy faster.

Section 3 of 7Test for oxygen

Test for oxygen
Light a splint and blow it out so it glows without a flame.
Put the glowing splint into the gas.
If the splint relights, the gas is oxygen.
  • Source
    • oxygen is made by plants in photosynthesis and by the decomposition of hydrogen peroxide.

Section 4 of 7Safety and care

Safety and care
Eye protection
  • Eye protection safety glasses must be worn when making and testing gases.
Keep apart
  • Keep apart flames must be kept away from limewater and flammable gases when not testing.
Wet tube
  • Wet tube the sides of a wet test tube can put out a glowing splint, so avoid touching them.

Section 5 of 7Using the results

Using the results
Each gas gives its own positive result only, so the three tests tell the gases apart.
A gas that gives no positive result is not hydrogen, carbon dioxide or oxygen.

Section 6 of 7Key terms

TermMeaning
HydrogenGas that gives a squeaky pop with a lit splint.
Carbon dioxideGas that turns limewater cloudy.
OxygenGas that relights a glowing splint.
LimewaterSolution of calcium hydroxide used to test for carbon dioxide.
Glowing splintA wooden splint with a glowing end but no flame.

Section 7 of 7Exam technique

1
A glowing splint relights in hydrogen — it relights in oxygen, and hydrogen gives a squeaky pop with a lit splint.
2
Limewater turns cloudy with oxygen — only carbon dioxide turns it cloudy.
3
The squeaky pop is the sound of the hydrogen splint going out — it is hydrogen burning rapidly.
4
Carbon dioxide relights a glowing splint — it puts a flame out.

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