Question

A CONTINUOUS ASSESSMENT
O ORAL TESTING
1. Is souring of milk a physical change or a chemical change? Why?
2. Is respiration a physical change or a chemical change ? How ?
3. What substance is added to grapes to bring about fermentation ?
4. What compounds are formed when magnesium is burnt in air ?
5. What solid substance is formed when lead nitrate solution is mixed with potassium iodide solution and
what is its colour ?
6. Zine pieces are added into dilute H2SO4 taken in a test tube and a burning candle is brought over the
mouth of the test tube. What will happen ?
7. What do you understand by balancing of a chemical equation ?
8. Name the three oxides of iron and tell their formulae..
9. How can you test whether the dissolution of a given salt in water is exothermic or endothermic ?
10. Which evolves more heat when same amounts of diamond and graphite are burnt in air?​

Answer 1

Explanation:

A CONTINUOUS ASSESSMENT

O ORAL TESTING

1. Is souring of milk a physical change or a chemical change? Why?

2. Is respiration a physical change or a chemical change ? How ?

3. What substance is added to grapes to bring about fermentation ?

4. What compounds are formed when magnesium is burnt in air ?

5. What solid substance is formed when lead nitrate solution is mixed with potassium iodide solution and

what is its colour ?

6. Zine pieces are added into dilute H2SO4 taken in a test tube and a burning candle is brought over the

mouth of the test tube. What will happen ?

7. What do you understand by balancing of a chemical equation ?

8. Name the three oxides of iron and tell their formulae..

9. How can you test whether the dissolution of a given salt in water is exothermic or endothermic ?

10. Which evolves more heat when same amounts of diamond and graphite are burnt in air?