Because substances are made up of different atoms and molecules, they react in characteristic ways. Production of a gas, color changes, a change in temperature, and the formation of a precipitate are ...

Chemical reactions make new chemicals. Atoms are rearranged during a chemical reaction, but the number of atoms does not change. Evidence of chemical reactions includes a large temperature change ...

Chemical reactions can take in energy or release energy, often in the form of heat. This causes a change in temperature. There are two different types of energy change that can take place.

This happens through two different types of chemical reactions. The reaction when the cathode gains electrons is called reduction. The reaction when the anode loses electrons is called oxidation.