Testing for Gases

• What should you be able to describe by the end of the video?

  How to test for hydrogen, oxygen, carbon dioxide, and chlorine
• Why is it important to learn the gas tests?

  They could be on a new exam and are easy to confuse
• What is the first step to test for hydrogen gas?

  Remove the bung and insert a burning splint
• What sound indicates the presence of hydrogen gas?

  A pop sound when it burns rapidly
• How do you test for oxygen gas?

  Insert a glowing splint into the test tube
• What happens to a glowing splint in the presence of oxygen?

  It bursts into flames
• What is used to test for carbon dioxide?

  Lime water
• What is lime water?

  Aqueous solution of calcium hydroxide
• How do you test for carbon dioxide using lime water?

  Bubble the gas through lime water
• What indicates that carbon dioxide is present when using lime water?

  The lime water turns cloudy
• What is the final gas tested for in the video?

  Chlorine
• How do you test for chlorine gas?

  Insert damp litmus paper into the test tube
• What happens to litmus paper in the presence of chlorine?

  It bleaches and turns white
• Where can you find more questions on testing for gases?

  In the vision workbook
• What is the significance of the tests for gases in exams?

  They are commonly asked questions