Practice Questions for Physical and Chemical Changes Science Class 8

The representation of a chemical reaction using symbols and formulas of the substances is called __________.






Keep an iron rod in moist place for a few days. A reddish brown deposit is found on it. Why is this deposit formed?
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A silver spoon tarnishes. This is an example of a __________.

In a displacement reaction, a more reactive metal displaces a less reactive metal from its compound. Is this statement true?

Naturalisation is __________ change.
Adding sodium chloride to water is a __________.