EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记:3.1.4 Practical: Investigating Temperature Changes

EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记:3.1.4 Practical: Investigating Temperature Changes

Practical: Investigating Temperature Changes

Aim:

To perform a calorimetry study of the reaction between HCl and NaOH

Materials:

  • Dilute hydrochloric acid
  • Dilute sodium hydroxide solution
  • Styrofoam (polystyrene) calorimeter & lid
  • 25 cm3 measuring cylinder
  • Thermometer & stirrer

 

Calorimeter - Styrofoam Cup, IGCSE & GCSE Chemistry revision notes

 

Diagram showing the apparatus for the calorimetry investigation for displacement, dissolving and neutralisation

 

 

Method:

 

 

  1. Using a measuring cylinder, place 25 cm3 of the NaOH solution into the calorimeter
  2. Measure and record the temperature of the solution
  3. Add 5 cm3 of the dilute HCl and stir
  4. Measure and record the highest temperature reached by the mixture
  5. Repeat steps 1 – 4 increasing the amount of acid added by 5 cm3 each time

 

Results:Record your results in a suitable table, eg:

Investigating Temperature Changes Table, downloadable IGCSE & GCSE Chemistry revision notes

Evaluation:

Plot a graph of the results and draw a line of best fit, using the graph to determine what volume of acid causes the biggest change in temperatureConclusion:The larger the difference in the temperature the more energy is absorbed or released

转载自savemyexams

更多IGCSE课程
翰林国际教育资讯二维码