Temperature rise in °C Metal
Mean
temperature
rise in °C
Test 1
Test 2
Test 3
Calcium
17.8
16.9
17.5
Iron
6.2
6.0
6.1
6.1
Magnesium
12.5
4.2
12.3
124
Zinc
7.8
8.0
7.6
7.8
(a) Give two variables the student should control so that the investigation is a fair test
(2)

What type of energy do chemical bonds have? what type of energy is it converted to during chemical reactions? question 15 options: chemical bonds have kinetic energy, which is converted to potential energy during chemical reactions. chemical bonds have electric energy, which is converted to potential energy during chemical reactions. chemical bonds have heat energy, which is converted to kinetic energy during chemical reactions. chemical bonds have potential energy, which is converted to heat energy during chemical reactions.