Question

1. Very short answer questions
1. What does a chemical formula of a compound represent?
2. What are reactants?
3. State the law of conservation of mass.
4. What happens to silvery grey iron when it reacts with moist air?
5. Name the product formed when hydrogen gas reacts with sulphide.
6. What happens when potassium iodide is added to lead acetate?
7. Why are reactants and products written in their molecular form?
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Answer 1

1. A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements. Water is composed of hydrogen and oxygen in a 2:1 ratio.

2. A substance that takes part in and undergoes change during a reaction.

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