Worksheet No.:6 · there is formation of one or more new substances, the change is called a chemical change. Germination of seeds, digestion of food, fermentation, rusting of iron,

CLASS : VII

Subject: Chemistry Date:19/5/2020Topic: Physical &Chemical Time limit:40mins

Change

Worksheet No.:6[Copy the questions following the notes solve them on a sheet of paper date wise. Keep the worksheets ready in a file to be submitted on the opening day.]

1) Answer the following questions:

i) What is freezing? Give example.ii) Differentiate between boiling and evaporation. (3 points )iii) What are the factors that affect evaporation? Explain.

iv) What is sublimation? Give examples.v) Define chemical change? Give examples.vi) Write the five characteristics of chemical change.vii) Differentiate between natural and man-made chemical change.

2. Fill in the blanks:

i) The Physical change is temporary and ………………ii) Germination of a seed is a …………….. change.iii) There is a change in the net …………….. of the system during a

chemical change.iv) During the condensation……………….remains constant

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