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in Chemistry by (61.9k points)

Give reasons for the following.

1.Chemical changes are accompanied by changes in energy.

2.Photosynthesis cannot take place at night.

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1. In a chemical change, molecules and atoms rearrange themselves to form new substances. This rearrangement involves some energy changes. It can either be absorption or evolution of energy.

2. Photosynthesis requires sunlight which is not available at night time. Therefore the process stops at night.

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