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Questions and Answers
What is the test for hydrogen gas?
What is the test for hydrogen gas?
- Extinguishing a flame
- Igniting a small sample to produce a squeaky pop (correct)
- Placing a glowing splint in a sample of gas
- Bubbling it through lime water
How can oxygen be tested?
How can oxygen be tested?
- Igniting a small sample to produce a squeaky pop
- Placing a glowing splint in a sample of gas (correct)
- Bubbling it through lime water
- Extinguishing a flame
What is the potential confusion when testing for oxygen using a glowing splint?
What is the potential confusion when testing for oxygen using a glowing splint?
- The splint may produce a high-pitched sound
- The splint may not re-ignite at all
- The splint may create a pop slightly on re-ignition, sometimes mistaken for hydrogen (correct)
- The splint may extinguish completely
What is the best way of testing for carbon dioxide?
What is the best way of testing for carbon dioxide?
What gas is produced when a pungent smelling gas is evolved using sodium hydroxide solution on a salt sample?
What gas is produced when a pungent smelling gas is evolved using sodium hydroxide solution on a salt sample?
What does a glowing wooden splint do when placed in a test tube of oxygen?
What does a glowing wooden splint do when placed in a test tube of oxygen?
What does bubbling carbon dioxide through calcium hydroxide solution (limewater) result in?
What does bubbling carbon dioxide through calcium hydroxide solution (limewater) result in?
What is the chemical name for limewater?
What is the chemical name for limewater?
What is the test for oxygen gas?
What is the test for oxygen gas?
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Study Notes
Testing for Gases
- The test for hydrogen gas is not specified.
- Oxygen can be tested using a glowing splint, which reignites in the presence of oxygen.
- A potential confusion when testing for oxygen using a glowing splint is that it may also reignite in the presence of air, which is not pure oxygen.
- The best way to test for carbon dioxide is by bubbling it through calcium hydroxide solution (limewater), which turns cloudy.
- When a pungent smelling gas is evolved using sodium hydroxide solution on a salt sample, it produces chlorine gas.
- A glowing wooden splint placed in a test tube of oxygen will reignite or burst back into flame.
- Bubbling carbon dioxide through calcium hydroxide solution (limewater) results in the formation of a white precipitate, causing the solution to turn cloudy.
- The chemical name for limewater is calcium hydroxide solution.
- The test for oxygen gas is using a glowing splint, which reignites in the presence of oxygen.
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