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It depends on the chemical reaction. For example when you burn something it is a chemical reaction, but that is way different than if you mix baking soda and vinegar which is also a chemical reaction. It changes the matter into a different chemical matter make up of that substance.
Chemical changes occur after a chemical reaction.
Changing temperature, density and pressure occur when a chemical reaction.
Heat?
This is a sign of a chemical reaction.
Lemon juice and baking soda will react endothermically to produce water, carbon dioxide, and the soluble salt sodium citrate. The chemical equation for this reaction is: HC6H5O7+NaHCO3-->CO2+H2O+NaC6H5O7.
In the chemical installations of the plant.
Any reaction occur.
no is not a chemical reaction
Baking is a chemical reaction for a few reasons. First off, heat is being applied to change a substance (cake mix / batter) into another substance (baked cake). Reactions occur such as water and moisture turning to steam as a result of the heat, and ingredients like water and baking soda / powder react to create a fluffy cake.
Any reaction occur.
The amount of energy necessary to cause a chemical reaction to occur is called activation energy.