C5 Energy Changes

Question 1

Exothermic and Endothermic reactions

Answer 1

Changes in energy

Question 2

Exothermic

Answer 2

An exothermic reaction is one which gives out energy to the surrondings
-this is shown by a rise in temperature
-an example could be hand warmers

Question 3

Endothermic

Answer 3

Energy is taken in from surrondings
-this is shown by a fall in temperature of the surrondings
-example of endothermic reaction would be the reaction between citric acid and sodium hydrogencarbonate

Question 4

Energy transfer can be Measured

Answer 4

1)You can use an experiment to investigate the temperature change of a chemical reaction
2) you can do this by taking the temperature of the reactants and mixing in the polysterne cup
3)if the temperature rises measure the highest temperature if the temperature falls measure the lowest

Question 5

The temperature change of reaction depends on different variables

Answer 5

1) you can also use this method to investigatw what effect different variables have on temperature change-e.g. the mass or concentration

Question 6

In an exothermic reaction is energy transferree to or from the surronding

Answer 6

In a exothermic reaction energy is given out