Temperature changes

• What is the aim of the investigation described in the study material?

  To investigate the variables that affect temperature change in chemical reactions
• What equipment is needed for the temperature change investigation?

  • 2 M Hydrochloric acid
  • 2 M sodium hydroxide solution
  • Expanded polystyrene cups and lids with thermometer holes
  • Thermometers
• How much hydrochloric acid should be measured for the experiment?

  25 cm³
• Why are expanded polystyrene cups used in the experiment?

  They provide insulation to minimize heat loss
• What type of solutions are used in the investigation?

  2 M Hydrochloric acid and 2 M sodium hydroxide solution
• What is the first step in the method of the investigation?

  Measure 25 cm³ of hydrochloric acid into a polystyrene cup
• What is the aim of the experiment described in the study material?

  Investigate the variables that affect temperature change in chemical reactions.
• What equipment is needed for the temperature change experiment?

  • 2 M hydrochloric acid
  • 2 M sodium hydroxide solution
  • Expanded polystyrene cups and lids with thermometer holes
  • Thermometers
• Why is a polystyrene cup used in the experiment?

  To provide stability and insulation for the temperature measurement.
• What is the first step in the method of the experiment?

  Measure 25cm² of hydrochloric acid into a polystyrene cup.
• What should be done after measuring the temperature of the hydrochloric acid?

  Measure 5cm³ of sodium hydroxide and add it to the polystyrene cup.
• What action should be taken after adding sodium hydroxide to the polystyrene cup?

  Quickly put a lid on the cup and gently stir the solution with the thermometer.
• When should the temperature be recorded during the experiment?

  When the reading on the thermometer stops changing and becomes fairly constant.
• How many times should sodium hydroxide be added to the cup?

  A minimum total of 40 cm³ needs to be added.
• What is the purpose of repeating steps 1-7 in the method?

  To ensure reliability of results.
• What should be calculated after completing the experiment?

  Calculate the mean maximum temperature reached for each of the sodium hydroxide volumes.
• What is the overall procedure for the temperature change experiment?

  1. Measure 25cm² of hydrochloric acid into a polystyrene cup.
  2. Place the cup in a beaker for stability.
  3. Record the temperature of the acid.
  4. Add 5cm³ of sodium hydroxide and stir.
  5. Record the temperature when stable.
  6. Repeat adding sodium hydroxide until 40 cm³ is reached.
  7. Repeat the entire process for reliability.
  8. Calculate the mean maximum temperature for each volume.