Question

2. When a change occurs:
(a) energy changes do not occur (b) energy is always given out (c) energy is always absorbed (d) energy is either absorbed or given out
3. Crystals of pure substance are obtained by the process called
(a) precipitation (b) galvanisation (c) crystallisation (d) chemical reaction 4. Which of the following gas turns lime water milky?
(a) Carbon monoxide (b) Oxygen (c) Hydrogen gas (d) Carbon dioxide​

Answer 1

Answer:

2. (d) energy is either absorbed or given out

3. (c) crystallisation

4. (d) Carbon dioxide

Explanation:

Answer 2

Answer:

2. option d is correct

3. option c is correct

4. option d is correct

Explanation:

your answers are as above