Question

IV. Answer the following questions in two sentences.
1. Differentiate between reversible and irreversible changes.
2. Give an example to show how an undesirable change can be prevented.
3. Why is formation of salt solution a physical change?
4. Why is burning of sugar a chemical change?
5. How can you change a liquid state of matter to its solid state?
V. Answer the following questions in about four to five sentences.
1. The water cycle is a series of reversible changes. Explain.
2. Explain the difference between physical and chemical change.
3. A change involves energy. Explain giving an example.​

Answer 1

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