1.
which of the following is a physical change? (2 points)

a newspaper burns when placed in a fire.

an iron chair rusts when left outside.

a sample of water boils and releases gas.

a plant changes carbon dioxide and water into sugar.

A sample of water boils and releases gas.

Explanation:

Physical change is a change where no any chemical reaction takes place only the chemical composition of matter changes. It is a reversible process .

Burning of newspaper, rusting of iron, plant changes carbon dioxide and water into sugar (photosynthesis) are  chemical reaction and irreversible process.

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