Which of these is true of chemical reactions? A.) all of these are true

B.) In a chemical reaction, one or more substances undergo a change in state.

C.) In a chemical reaction, one or more new substances are formed from one or more other substances.

D.) In a chemical reaction, the substances that are combined always form a gas.

c. is the answer

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.