Q3 of 20 Page 143

Answer the following:

Write any three differences between physical change and chemical change.

Differences between a physical change and chemical change:



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2

Balance the following reactions :

Fe + H2O → Fe3O4 + H2↑

 2

Balance the following reactions :

CH4 + O2→ CO2 + H2O

 3

Answer the following:

Group the following into physical change and chemical change.


Dissolving salt in H2O, Burning of a fuel,


Rusting of iron, melting of an ice cube.

 3

Answer the following:

Mention one example each for the different types of chemical reactions.