some plants, like clover, have bacteria in their roots that can change nitrogen from the air into nitrogen compounds

Question

physical or chemical change

Answer 1

The process in which bacteria in the roots of plants convert nitrogen from the air into nitrogen compounds is a chemical change.

Answer 2

plants absorb nitrogen compounds through their roots
physical or chemical change

Answer 3

The absorption of nitrogen compounds through the roots of plants is a physical change.

Answer 4

Death and decay of animals and plants returns nitrogen compounds to the soil
physical or chemical change

Answer 5

The death and decay of animals and plants, which returns nitrogen compounds to the soil, is a chemical change. During decomposition, organic matter is chemically broken down into simpler compounds, including nitrogen compounds, through the action of bacteria and other decomposers.

Answer 6

Lightning storms make nitrogen and oxygen react to form nitrogen dioxide

Answer 7

The reaction of nitrogen and oxygen to form nitrogen dioxide during lightning storms is a chemical change. The high energy and heat from the lightning cause the nitrogen and oxygen molecules to chemically react, resulting in the formation of nitrogen dioxide.

Answer 8

Nitrogen dioxide dissolves in rain
physical or chemical change

Answer 9

The dissolution of nitrogen dioxide in rain is a physical change. When nitrogen dioxide comes into contact with rainwater, it dissolves and becomes dispersed throughout the water. No new compounds are formed; it is simply a physical mixing of the nitrogen dioxide with water molecules.