A gas can be a reactant in a chemical reaction. For example, iron and the gas oxygen react to form rust, which is iron oxide.
A gas-evolution reaction is a reaction that results in the formation of a gas.
An example of a chemical equation with water as a reactant is the reaction between hydrogen gas and oxygen gas to form water: 2H2 + O2 -> 2H2O.
Hydrogen gas can be both a product and a reactant depending on the chemical reaction. In some reactions, hydrogen gas is produced, while in others it is consumed.
reactant + reactant = product
If a substance is a reactant or product of a chemical reaction then, by definition, it cannot be a catalyst.
If a substance is a reactant or product of a chemical reaction then, by definition, it cannot be a catalyst.
endothermic reaction
reactant elements and molecules are used in a chemical reaction, they are not mixed or combined or produced in a chemical reaction.
In a chemical reaction the limiting reactant is the reactant that there is the least of in the reaction; it determines the amount of product formed. In a chemical reaction it is the reactant that gets completely "used up"
A reactant is a substance that enters into a chemical reaction and is transformed into a new product. It is present at the start of the reaction and gets consumed during the process.
The catalyst is not a reactant in a chemical reaction but contribute to the success of this reaction.
A chemical that undergoes a chemical reaction is called a reactant. The chemicals that are produced by a chemical reaction are called the products. So in a chemical reaction, reactants turn into products.