Worksheet: Identifying Gases

In this worksheet, we will practice using qualitative chemical tests to identify common gases, including hydrogen, oxygen, carbon dioxide, and chlorine.

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

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

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

Which of the following reactions could have produced the gas?

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

What is the probable identity of the colorless liquid?

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

Which of the following reactions could have produced the gas?

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

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.