Question

Q.IV. State whether the following statements are true or false
1. Curdling of milk is a physical change.
2. Burning of magnesium ribbon is an exothermic change.
3. cutting of log of wood into pieces is a chemical change.
4. Formation of manure from leaves is a physical change.
5. Iron and rust are the same substances.

Answer 1

Explanation:

true

true

false

true

true

I think it is a correct answer

Answer 2

Answer:

1. False

2. True

3. False

4.False

5. False

Explanation:

Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula.

Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light

Burning of magnesium ribbon causes a dazzling white light.

Iron and rust are the same substances. (False)

Iron and rust are different substances. Rust is iron oxide. (Fe2O3).