Question

1. Fill in the blanks.
(a) Folding a cloth is a Physical
change.
(b) Tailoring of your school uniform is a
change
(C) Most substances benz
as their temperature rises.
(d) Metals content on cooling.
(e) Melting of ice is a Dhulia change.
2. State true or false.
(a) Withered flowers can be brought back to life. F
(b) Baking bread is an irreversible change. T
(c) Cutting of paper is a chemical change.
(d) Rubber expands on heating. F
(e) Mixing of vinegar and baking soda is a chemical change. T
3. Define the following terms in your own words, and give one example for each.
(a) Reversible change
(b) Irreversible change
(c) Contraction
(d) Expansion
4. How is water different from other substances in its response to heat?
5. Give two differences between
(a) reversible and irreversible changes.
(b) physical and chemical changes.
6. Heating or cooling milk is a reversible change. Explain.
7. Why are the telephone wires not pulled tightly?
8. Melting of butter is a physical change. How?
9. Differentiate between physical and chemical properties of a substance. Explain with an
example.
10. Why does a hot glass break under cold running water?बेकिंग ब्रेड एंड इंस्टेबल चेंज ट्रू या फॉल्स ​

Answer 1

Answer:

a yes bno y n y y n y nynynnynynn

Answer 2

Answer:

1.a. physical change

b.physical change

c.don't know

d.chemical change

e.physical change

2.a.false

b. true

c.true

d.false

e.true

3.a. reversible change= it is a type of  change that can be reversed.example=melting of ice,etc

b.irreversible change=it is the type of change which can not be reversed.eg =burning of paper,rusting of iron.

c. contraction = that can contract each other . eg = magnet

d. expansion = that can expand each other

4. water is a liquid substance and it can easily dissolve with salt and sugar . and when we heat water than it changes into gas or we can say evaporation . because it is liquid .

mark as brainliest please ......