Equipment

• What is as important as setting up equipment correctly for an experiment?

  Making accurate measurements
• Why does the system need to be sealed when collecting gases?

  To prevent gas escape during collection
• When might you want to collect gas produced by a reaction?

  To investigate the rate of reaction
• What is the most accurate way to measure the volume of gas produced?

  Collect it in a gas syringe
• How can you collect gas by displacing water?

  By using a measuring cylinder upside down
• What should you record when collecting gas in a measuring cylinder?

  The initial water level
• Where should the delivery tube be positioned when measuring gas?

  Inside the measuring cylinder
• What happens to the water in the measuring cylinder as gas enters?

  The water is pushed out
• What should you do after collecting gas in a measuring cylinder?

  Record the final water level
• Why is it important to seal the equipment when measuring gas?

  To ensure accurate results without gas loss
• If the delivery tube is under the measuring cylinder, what could happen?

  Gas might escape into the air
• What could occur if the delivery tube is positioned incorrectly?

  Inaccurate gas volume measurements
• What should you do if you only want to collect a gas sample?

  Collect it without measuring volume
• What are the steps to collect gas using a measuring cylinder?

  1. Fill the measuring cylinder with water.
  2. Invert the cylinder in a water container.
  3. Connect the delivery tube to the reaction vessel.
  4. Allow gas to displace water in the cylinder.
  5. Record the initial and final water levels.
• What factors affect the accuracy of gas collection in experiments?

  • Sealing of the system
  • Positioning of the delivery tube
  • Measurement techniques used
  • Environmental conditions (temperature, pressure)
• What is the main concern if the delivery tube is underneath the measuring cylinder?

  Gas might escape into the air
• What can you do if you just want to collect a sample without measuring volume?

  Use a test tube over water
• What should you do once the test tube is full of gas?

  Stopper it and store the gas
• Where can you find more information about electrolyses?

  Pages 48-50
• What does the products of electrolysis depend on?

  Reactivity of ions in the solution
• What will you get at the cathode when electrolyzing a solution?

  Pure metal or hydrogen gas
• What happens at the anode during electrolysis?

  Oxygen gas or halogen is produced
• How do you predict the products of an electrolysis experiment?

  By comparing ions to H⁺ and OH⁻ ions
• What will you get at the anode if halide ions are present?

  Halogen gas
• What do you need to identify at the cathode during electrolysis?

  The products formed from the ions present
• What is the easiest way to collect gas produced in electrolysis?

  Using an inverted test tube
• What is the significance of setting up equipment correctly in electrolysis?

  To ensure accurate gas collection
• What is the purpose of the test tube in the electrolysis setup?

  To collect the gas produced
• What is the role of the electrodes in electrolysis?

  To facilitate the flow of electricity
• Why is it important to draw diagrams of your equipment?

  To visualize the setup for better understanding