Question

12. Fill in the blanks:
1. The chemical name of baking soda is
2. What is the chemical formula of baking soda
3. Two methods by which rusting of iron can be prevented are
and
4. Changes in which only
properties of a substance change are called
physical changes.
5. Changes in which new substances are formed are called
changes..​

Answer 1

Answer:

1. sodium hydrogen carbonate

Answer 2

1-Sodium hydrogen carbonate

2-NaHCO

3-ANSWER

→ Coating with zinc − galvanising

→ Oiling or greasing

4-physical

5-chemical