Question

Stay true or false

1. Sodium hydrogen carbonate is the
chemical name of baking soda.
2. Evaporation of water is a chemical change.
3. Melting of wax and burning of candle both are similar changes.
4. Corrosion does not harm the iron objects.
5. Chemical change are always reversible.

Please give me answer fast tomorrow is my exam.
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Answer 1

Explanation:

1. True

2. False

3. True

4. False

5. False

Hope it helps you

Answer 2

Explanation:

1. Sodium hydrogen carbonate is the chemical name of baking soda.

→ True

Chemical formula of sodium hydrogen bicarbonate is NaHCO3

2. Evaporation of water is a chemical change.

→ False

Evaporation of water is a physical change. Because when it evaporates, it changes from liquid state to gas state and it still remains water.

3. Melting of wax and burning of candle both are similar changes.

→ True

Melting of wax is physical change. While burning of candle is both physical and chemical change. So, we can say that melting of wax and burning of candle both are similar changes (physical change).

4. Corrosion does not harm the iron objects.

→ False

Rusting of iron occurs when iron is exposed to air or moisture.

5. Chemical change are always reversible.

→ False

All chemical change are always irreversible.