"Substance" is too fuzzy a word. Chemical reactions can change materials into other compounds, for example shiny iron into rust (Fe2O3). But it cannot change an element into another element. A nuclear reaction can do that, for example uranium into plutonium.
A chemical reaction is a reaction in which a substance is turned into another completely different substance
Chemical reaction
Generally chemical energy can be defined as the aptitude of a substance to be transformed in another substance by a chemical reaction.
The conversion of one substance to another substance is a chemical change, which happens as a result of a chemical reaction.
This is a typical chemical reaction.
The () sign in a chemical reaction signifies that a substance is being added or combined with another substance.
Chemical reaction
This is called synthesis, a combination chemical reaction that changes the chemical bonds in the substances.
A synthesis reaction
synthesis reaction
This reaction is called fermentation.
This could refer to a chemical transformation (chemical change), a chemical reaction, or spontaneous change. Some changes require another substance or substances to be mixed together. Some reactions will occur by themselves without any outside manipulation or stimulation.