Edexcel (9-1) Topic 7

Which shows the correct reaction profile for an endothermic reaction?

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]higher[blank_end] than the energy used to break them.

Two solutions are added together. The temperature of the reaction 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.

Which line represents the fastest overall reaction?

Select the correct statement about how the rate changes during the reaction.

Select all the factors that can change the rate of reaction. (hint: there's more than one)

Using data from the table, what was the mean rate of reaction? [blank_start]0.5[blank_end] cm3/s

The activation energy for a reaction was measured with and without a catalyst. Select the value that was the value for the catalysed reaction.

Increasing the [blank_start]surface area[blank_end] of reactants frees up more particles that are available to [blank_start]collide[blank_end] right away. This doesn't add more particles in to the reaction, it only allows particles that would have once had to wait for other particles to [blank_start]react[blank_end] first to be available. This leads to more [blank_start]frequent[blank_end], successful collisions and so the rate of reaction increases.

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

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