Question

A. Identify the type of change, when-
1. NaCl dissolves in water.
2.Silver tarnishes
3. An apple is cut
4.Heat causes water to change to steam
5.Baking soda reacts with vinegar
6.Fe rusts
7. Washing soda is mixed with lemon juice . bubbles are formed with the evolution of gas.
8. Mixing a cocktail of fruit juice
9. Squeezing an orange
10. Boiling potatoes​

Answer 1

Answer:

Identify the type of change, when-

1. NaCl dissolves in water.

2.Silver tarnishes

3. An apple is cut

4.Heat causes water to change to steam

5.Baking soda reacts with vinegar

6.Fe rusts

7. Washing soda is mixed with lemon juice . bubbles are formed with the evolution of gas.

8. Mixing a cocktail of fruit juice

9. Squeezing an orange

10. Boiling potatoes

Answer 2

Answer:

When baking soda (Sodium hydrogen carbonate) is mixed with lemon juice (citric acid), bubbles are formed. The bubbles are formed due to the evolution of carbon dioxide gas. This is a chemical change.

In this change, citric acid contained in lemon juice reacts with sodium hydrogen carbonate which results in the evolution of carbon dioxide gas.

Lemon juice + Baking soda → Carbon dioxide + Other substances

Citric acid Sodium

Hydrogen carbonate