Investigating Temperature Changes

• What instrument is used to measure temperature changes?

  Thermometer
• What is the purpose of a large beaker in temperature investigations?

  To hold the reaction mixture
• What should you do with the temperature at the start of the experiment?

  Record it
• Why is it important to record temperature at regular intervals?

  To calculate the greatest temperature difference
• What is the purpose of the lid in the experiment?

  To reduce energy loss
• What must the reactants be at before mixing?

  Constant, equal temperature
• What material is used to help reduce energy loss?

  Cotton wool
• What are the four reactions suitable for this temperature change method?

  1. Neutralisation
  2. Displacement
  3. Acid + metal
  4. Acid + metal carbonate
• What is the independent variable in the temperature change experiment?

  Concentration or mass of reactants
• What is the dependent variable in the temperature change experiment?

  Temperature change
• How is temperature change related to the energy change of the reaction?

  It measures the energy change
• What are the required practicals for investigating temperature changes?

  • Use a thermometer
  • Use a large beaker
  • Record initial and interval temperatures
  • Calculate greatest temperature difference
  • Ensure reactants are at constant temperature
  • Use a polystyrene cup and cotton wool