Question

write true false and correct the false statements.

1. In an exothermic reaction, heat is given out.
2. In a chemical reaction no new substance is formed. a
3. Reaction of zinc pieces with hydrochloric acid is an exothermic reaction.
4. Glowing of an electric bulb is a physical change.
5. Breaking of a glass tumbler is a reversible change.
6. Burning of wood is a chemical change.​

Answer 1

Answer:

1. True

2. False

3. True

4. True

5. False

6. True

Explanation:

I think these are correct

Answer 2

Answer:

1) True

2) False

3) True

4) True

5) False

6) True

Explanation:

1) Yes. That's the very definition.

2) A change is said to be chemical if there is a new substance formed hence the statement is false.

3) Yes, this is usually due to bond formation but this will be taught in class 9 or 10.

4) Yes, there is new substance formation.

5) This can't be reversed obviously but remember it is a physical change.

6) Yes, burning of wood gives ash and smoke(mixture of gases).