Question

A. Recalling Ideas
1. Select the correct option:
1. During physical and chemical changes:
(a) energy is always absorbed
(b) energy is always released
(c) no energy is absorbed or released
(d) energy is either absorbed or released
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:

1. d

2. d

3. c

4. a

plz follwe me