EASY
7th CBSE
IMPORTANT
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Write P for physical change and C for chemical change.
Cooking of food

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Important Questions on Physical and Chemical Changes

EASY
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 1
Write P for physical change and C for chemical change.
Grating of a carrot
EASY
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 1
Write P for physical change and C for chemical change.
Digestion of food
MEDIUM
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 2
Shikha disposed of some old paper by tearing it into tiny pieces and throwing them in the dustbin. Rohit disposed of the paper by placing it in a mud pot and setting fire to it. Which of these is a physical change? Explain.
HARD
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 2
A strip of iron turned reddish in color when strongly heated, but changed back to its earlier appearance after it cooled. Did any chemical change take place? Explain.
MEDIUM
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 2
A strip of iron rusted when it was left in the open for a few days. Rubbing the strip with sand paper gave the strip its earlier appearance. At what stage did a chemical change take place? Explain.
HARD
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 3
Write the chemical equation for the reaction that takes place when a magnesium ribbon is burnt in air.
MEDIUM
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 4
Fill in the blank to complete the sentence about the experiment.
An iron nail is dropped into a copper sulphate solution in a flask.
A green solution is seen in the flask after some time. This is a solution of _____.
MEDIUM
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 4
An iron nail is dropped into a copper sulphate solution in a flask. Fill in the blank to complete the sentence about the experiment.
A brownish coating of _____ forms on the nail.