Question

A plant uses the energy from sunlight to create oxygen and glucose from carbon dioxide and water. Which statement is true about the changes that have occurred? A. A chemical change has occurred because new compounds have been produced. B. A chemical change has occurred because energy was needed. C. A physical change has occurred because the substances are still gases. D. A physical change has occurred because the plant looks different.

Answer 1

Answer: A. A chemical change has occurred because new compounds have been produced.

Explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.Example: Melting of ice

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.Example: photosynthesis

Photosynthesis is the process used by plants, algae and certain bacteria to convert energy from sunlight and turn it into chemical energy in the form of glucose which is used a s a source of energy by many organisms.

$6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2$

Thus the true statement is a chemical change has occurred because new compounds have been produced.

Answer 2

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❖ The correct answer choice is A. A chemical change has occurred because new compounds have been produced.

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