Answer:
Substances can change into new substances through chemical reactions. Two ways this can occur are:
Combustion: Combustion is a chemical reaction in which a substance (often a hydrocarbon like gasoline or wood) reacts with oxygen to produce heat, light, and new chemical compounds. For example, when gasoline burns in the presence of oxygen, it undergoes combustion to produce carbon dioxide and water vapor, along with the release of energy.
Chemical Decomposition: Chemical decomposition is a process in which a compound breaks down into simpler substances under certain conditions, such as heat or the addition of another chemical. An example is the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2) when exposed to light or heat.
In both of these processes, the original substances undergo chemical changes, leading to the formation of new substances with different chemical properties.
Step-by-step explanation: