5 How do physical and chemical changes affect humans and nature? Matter on the Earth goes through physical and chemical changes all the time. Discuss whether the examples in the pictures are physical or chemical changes, and the effects they have on humans and nature.
Reading to Learn Science for You
Read ‘Matter Decay’ to learn about chemical changes in nature. Appendix 4
1
2
burning coal and oil
raining
3
food waste compost
Changes of matter
produce new matter
do not produce new matter
Physical changes
Chemical changes
Change of state
Change of shape
Burning
Rusting
Decaying Cooking
freezing dissolving
squeezing
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