CHemistry - Temperature changes
Investigating endo and exothermic reactions
Investigating endo and exothermic reactions
Temperature changes
This is an investigation looking at the temperature change in an endo and exothermic reaction.
Check your understanding with these quick common questions. Use the drop down boxes to see the correct answers.
Exo and endothermic reactions
You could be asked to investigate
Acids + Metal
Acids + Carbonates
Acids + Alkalis (neutralization)
Displacement reactions
Independent variable: Starting temperature or concentration of one reactant.
Dependent variable: Temperature change (°C).
Thermometer or temperature probe, insulated cup or polystyrene beaker, lid.
Improve accuracy: Use a digital temperature probe.
Control validity: Keep reactant volumes and concentrations constant. The main weakness is the loss of heat by not having a lid. Have a lid.
The bigger the temperature change in the reaction, the more energy is absorbed or released. Remember that endothermic reactions absorb energy from the surroundings, and exothermic reactions transfer heat into the surroundings.
Measure known volumes of reactants into an insulated cup.
Record initial temperature.
Mix chemicals, replace lid, and record highest or lowest temperature reached.
Calculate the temperature change.
Repeat for different solutions
Record three repeats for each solution and calculate a mean