CBSE Class 7 - Science - Physical & Chemical Changes (Worksheet)(#eduvictors)(#cbse2020)(#class7Science)

Physical & Chemical Changes (Worksheet)

CBSE Class 7 - Science   

Fill in the blanks with suitable words:

1. In a ________ change, no new substance is formed.

2. Shape, size, colour and state are called __________ properties of a substance.

3. Rusting of iron occurs when iron gets in contact with moisture is an example of _______ change.

4. Change in the colour of the substance often indicates that it is a ________ change.

5. Litmus paper shows blue colour, it indicates that the medium is _________.

6. Take vinegar (acetic acid) in a glass beaker and add a pinch of baking soda (sodium hydrogen carbonate) to it. We observe gas bubbles coming out of the beaker. This is due to the release of ____________ gas.

7. The rusting of iron can be prevented by coating iron with zinc, this process is called __________.

8. Melting of candle wax is a______________ change but its burning is a ______________ change.

9. Chemical name of Blue Vitriol is ____________.

10. Crystallisation is an example of ___________ change.

11. Photosynthesis is an example of ___________ change.

12. Stainless steel is made by mixing _____ with carbon and metals like chromium, nickel and manganese. 

Answers:

1: physical

2: physical

3: chemical

4: chemical

5: basic

6: carbon dioxide (CO₂)

7: galvanisation

8: physical, chemical

9: Copper Sulphate

10: physical

11: chemical

12: iron

👉See Also:

Ch 6 Physical and Chemical Changes(Q &A)
Ch 6 Physical and Chemical Changes (MCQs)