Heat energy changes in chemical reactions - Edexcel

1

What piece of apparatus could be used to find out if a chemical reaction was exothermic or endothemic?

2

What term is given to a reaction which transfers heat energy to the surroundings?

3

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

4

Which of the following processes is endothermic?

5

What is the effect of a reaction if the energy involved in breaking bonds is less than the energy involved in forming bonds?

6

On a reaction profile, what does the height of the 'hump' represent?

7

Which statement about energy changes during reactions is correct?

8

What can you deduce from the reaction profile below?

a reaction profile graph showing the energy of the reactants lower than the energy of the products

9

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

10

If the energy changes during a reaction are as follows:

Energy to break bonds = 150 kJ

Energy to form bonds = 110 kJ

Which of the following is the correct calculation of the overall energy change?