It is neither, the reaction is the process.
The chemicals 'put in' to the reaction are called reactants, and those formed by the reaction are products
A substance that lowers the energy needed to start a chemical reaction is a catalyst.
The reactants
An endothermic reaction is one that consumes heat.
The reactant is the substance present at the start of a chemical reaction, while the product is the substance(s) formed from a chemical reaction.
The heat from a match is needed to provide the activation energy required to start the chemical reaction. This initial input of energy breaks the bonds in the reactants and allows new bonds to form, leading to the reaction progressing on its own. Once the reaction is initiated, it can continue releasing energy as it proceeds.
Combustion, burning, releases more heat that is taken in to start the reaction.
A substance that lowers the energy needed to start a chemical reaction is a catalyst.
The initial compounds in a chemical reaction are called reactants.
A chemical reaction need an activation energy to start.
The reactants
centrioles
The reactants
Either an energy source to start the reaction or a catalyst.
but
An endothermic reaction is one that consumes heat.
The substance present at the start of a chemical reaction is called a reactant. Reactants are the starting materials that undergo chemical changes to form products during a reaction.
The energy required to start a chemical reaction is called activation energy. It is the minimum amount of energy needed to initiate a reaction by breaking the chemical bonds of the reactants. This energy barrier must be overcome for the reaction to proceed.