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Lesson: Identifying Gases

Worksheet • 2 Questions

Q1:

A student uses a test tube to collect the gas produced by a chemical reaction. After lighting a splint, they blow out the flame and then insert the splint into the test tube. It reignites and glows brightly.

What is the probable identity of the gas?

  • A Oxygen
  • B Ammonia
  • C Hydrogen
  • D Chlorine
  • E Carbon dioxide

Why does the splint glow more brightly than it did when burning in air?

  • A Because it is burning faster
  • B Because the gas is forming a plasma
  • C Because the gas is burning too
  • D Because the gas catalyzes the combustion of the splint

Which of the following reactions could have produced the gas?

  • A Hydrogen peroxide with manganese oxide catalyst
  • B Aluminum chloride + sodium hydroxide
  • C Zinc + sulfuric acid
  • D Barium carbonate + nitric acid
  • E Silver oxide + hydrochloric acid

Q2:

A student uses a test tube to collect the gas produced by a chemical reaction. When a lit splint is placed at the opening of the test tube, there is a brief flash and a loud popping sound. In addition, fine droplets of colorless liquid are formed on the inside of the tube.

What is the probable identity of the gas?

  • A Hydrogen
  • B Ammonia
  • C Oxygen
  • D Methane
  • E Carbon dioxide

What is the probable identity of the colorless liquid?

  • A Water
  • B Oil
  • C Ammonia solution
  • D Ethanol
  • E Liquid carbon dioxide

Which of the following reactions could have produced the gas?

  • A Zinc + hydrochloric acid
  • B Sodium hydroxide + water
  • C Magnesium carbonate + heat
  • D Zinc + copper(II) sulfate
  • E Lithium oxide + sulfuric acid
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