Question

complete the table.

get help here

	physical change	chemical change
death and decay of animals and plants return nitrogen compounds to the soil	○	○
lightning storms make nitrogen and oxygen react to form nitrogen dioxide	○	○
nitrogen dioxide dissolves in the rain	○	○
some plants, like clover, have bacteria in their roots that can change nitrogen from the air into nitrogen compounds	○	○

check answer remaining attempts : 3

Explanation:

Step1: Recall physical and chemical change definitions

Physical change is a change in which no new substances are formed, only physical properties like shape, state change. Chemical change is a change in which new substances are formed.

Step2: Analyze "Plants absorb nitrogen compounds through their roots"

This is a biological - chemical process where plants take in nitrogen - containing substances and use them in metabolic reactions. New chemical compounds are formed within the plant cells. So it is a chemical change.

Step3: Analyze "Death and decay of animals and plants return nitrogen compounds to the soil"

Decay is a decomposition process involving the breakdown of complex organic compounds into simpler ones by microorganisms. New substances are formed during decay. So it is a chemical change.

Step4: Analyze "Lightning storms make nitrogen and oxygen react to form nitrogen dioxide"

A chemical reaction occurs between nitrogen and oxygen to form a new compound (nitrogen dioxide). So it is a chemical change.

Step5: Analyze "Nitrogen dioxide dissolves in the rain"

When nitrogen dioxide dissolves in rain, it reacts with water to form nitric acid and other substances. New chemical substances are formed. So it is a chemical change.

Step6: Analyze "Some plants, like clover, have bacteria in their roots that can change nitrogen from the air into nitrogen compounds"

This is nitrogen - fixation, a chemical process where molecular nitrogen is converted into ammonia or other nitrogen - containing compounds by bacteria. New chemical compounds are formed. So it is a chemical change.

Answer:

Statement	Physical Change	Chemical Change
Death and decay of animals and plants return nitrogen compounds to the soil		O
Lightning storms make nitrogen and oxygen react to form nitrogen dioxide		O
Nitrogen dioxide dissolves in the rain		O
Some plants, like clover, have bacteria in their roots that can change nitrogen from the air into nitrogen compounds		O