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Identification of common gases
Study the practical tests used to identify common gases from their characteristic observations.
18
Objectives
10
Flashcards
10
Questions
90 min
Study time
AqaGcseChemistryChemical analysis
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Syllabus checklist
What you need to know
18 objective pages available
Test for hydrogen4 objectives
- Describe the test for hydrogen using a lighted splint.
- Recall that hydrogen burns with a squeaky pop.
- Interpret a squeaky pop as evidence that hydrogen is present.
- Distinguish the hydrogen test from tests for oxygen, carbon dioxide and chlorine.
Test for oxygen4 objectives
- Describe the test for oxygen using a glowing splint.
- Recall that oxygen relights a glowing splint.
- Interpret a glowing splint relighting as evidence that oxygen is present.
- Distinguish the oxygen test from tests for hydrogen, carbon dioxide and chlorine.
Test for carbon dioxide5 objectives
- Describe the test for carbon dioxide using limewater.
- Recall that carbon dioxide turns limewater milky.
- Explain that the milky appearance is caused by formation of a solid precipitate.
- Interpret limewater turning milky as evidence that carbon dioxide is present.
- Distinguish the carbon dioxide test from tests for hydrogen, oxygen and chlorine.
Test for chlorine5 objectives
- Describe the test for chlorine using damp litmus paper.
- Recall that chlorine bleaches damp litmus paper.
- Interpret bleaching of damp litmus paper as evidence that chlorine is present.
- Explain why the litmus paper must be damp for the chlorine test.
- Distinguish the chlorine test from tests for hydrogen, oxygen and carbon dioxide.
Key terms
Test for hydrogenSqueaky popsqueaky pophydrogen testHydrogen testTest for oxygenGlowing splintOxygen testglowing splintoxygen testDistinguishTest for carbon dioxide
Exam tips
- Hydrogen Test Tip: Remember to always remember that hydrogen produces a squeaky pop when tested with a lighted splint. Link your answer to Test for hydrogen, and keep the test, observation, and conclusion distinct where qualitative analysis is involved.
- Remember the Squeaky Pop Test: Remember to when preparing for the exam, practice recalling that hydrogen burns with a squeaky pop when tested with a lighted splint. Link your answer to Test for hydrogen, and keep the test, observation, and conclusion distinct where qualitative analysis is involved.
Common mistakes
- Common Mistake in Hydrogen Test: Remember that the hydrogen test specifically uses a lighted splint to produce a squeaky pop, while the oxygen test uses a glowing splint to relight.
- Hydrogen Test Recall: Focus on the specific characteristic of hydrogen, which is the distinct squeaky pop sound when ignited.
Practice preview
- Which statement would earn credit for Describe the test for hydrogen using a lighted splint.?
- For Identification of common gases, which option uses the correct Chemical analysis evidence for hydrogen gas?
- Which answer avoids confusing hydrogen gas with another qualitative analysis result?
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