AQA (9-1) Topic 5

Oxygen and hydrogen will not react until a lighted splint is used. This is because [blank_start]energy[blank_end] must be supplied to the reaction to start it.

Two solutions are added together. The temperature goes down. What type of reaction is this?

The temperature of 50 ml acid, in a 100 ml beaker was 18 Celsius. 2 g of calcium carbonate was added, and when it finished reacting the temperature was now 42 Celsius. The temperature change was [blank_start]24[blank_end] Celsius.

Using the given bond energies, calculate the overall energy change of this reaction. (remember that bond breaking is a positive energy process [requires energy], and bond making is a negative energy process [releases energy]). Overall energy change is [blank_start]-183[blank_end] kJ/mol

Bonding breaking is an [blank_start]endothermic[blank_end] process, whilst bond making is an [blank_start]exothermic[blank_end] process. In an exothermic reaction, the energy release from forming bonds is [blank_start]greater[blank_end] than the energy used to break them.

Which shows the correct reaction profile for an endothermic reaction?

Which of the following is not an example of an endothermic reaction?

If the energy change of a reaction has a positive (+) value, then the energy change is [blank_start]endothermic[blank_end]; if is has a negative (-) value, then the change is [blank_start]exothermic[blank_end]