energy changes

Question 1

endothermic

Answer 1

takes energy in (colder)

Question 2

exothermic

Answer 2

gives energy out (hotter)

Question 3

example of endothermic reaction

Answer 3

electrolysis

Question 4

example of exothermic reaction

Answer 4

burning, neutralisations

Question 5

hydrogen fuel cell advantages

Answer 5

only water produced - no carbon emissions

Question 6

hydrogen fuel cell disadvantages

Answer 6

production uses fossil fuels
doesn’t work at low temperatures