1. Give two examples to show that changes
can be observed by their effects.
2. Distinguish between physical and chemical
changes.
3. Distinguish between a reversible and an
irreversible change.
4. Define chemical change.
Answers
Answer:
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Explanation:
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Explanation:
1Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
2It cannot become paper again. Your height cannot decrease. These are irreversible changes. They cannot be reversed at all.
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Difference between reversible changes and irreversible changes.
Reversible changesIrreversible changesMost physical changes are reversible changes.All chemical changes are irreversible changes.