1. Nitrogen gas turns lime water milky. 2. Cutting a log of wood into pieces is a chemical change.

Question

True or False – if false give the correct statement.

1. Nitrogen gas turns lime water milky.

2. Cutting a log of wood into pieces is a chemical change.

3. Iron pipes coated with zinc do not get rusted easily.

4. Iron and rust are the same substances.

5. The chemical name of baking soda is sodium bicarbonate

6. Adding sugar to milk is a physical change.

7. Magnesium + oxygen → magnesium oxide. 2Mg + O₂ → 2Mg O

8. Evaporation is a fast process and occurs only at the surface of the liquid

9. The rate of evaporation is more when the surface area is greater.

10. When lemon juice is mixed with soda water, they produce brisk effervescence.

Answer 1

1. False. 

Carbondioxide gas turns lime water milky.

2. False. 

Cutting a log of wood into pieces is a physical change.

3. Iron pipes coated with zinc do not get rusted easily.

4. Iron and rust are the same substances.

5. False. Rust is iron oxide.

6. True.

7. True.

8. True

9. False. 

Evaporation is a slow process and occurs only at the surface of the liquid.

10. True.