The answer is during a metal reaction to acid, it makes salt and hydrogen.
Another way is
Acid + Metal > Metal Salt + Hydrogen
two
A decomposition reaction is a change in which one substance is broken down into two or more substances. This type of reaction is the opposite of a combination reaction, where two or more substances combine to form one product.
A reaction in which parts of two substances switch places to form two new substances is called a double displacement reaction, or double replacement reaction. In this type of reaction, the cations and anions of the reactants exchange partners, resulting in the formation of new products. A common example is the reaction between an acid and a base, which can produce water and a salt.
In a chemical reaction, two or more substances called reactants react, resulting in substances called products.
A synthesis reaction
The term for a type of reaction in which two substances react to produce a single compound is combination reaction. This is a type of chemical reaction.
A synthesis reaction.
This is a spontaneous reaction.
When from two substances is obtained a new substance the reaction is called synthesis.
A decomposition reaction results in the breakdown of a chemical into simpler substances. In this type of reaction, a single compound breaks down into two or more simpler substances.
In a chemical reaction, two or more substances called reactants react, resulting in substances called products.
two