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### Maths. Midterm exam 2021. St...

The combination or displacement that occurs in the molecules of matter during a chemical change called a chemical reaction. Any two examples are:

1. 2H2 + 02 -------> 2H20
2. H2SO4 + Zn ---------> ZnSO4 + H2

A chemical reaction in which an atom of a compound is displaced by another element is called a displacement reaction. Its types are:

1. Single displacement rxn.
2. Double displacement rxn.

The atomic weight of an element expressed in grams is called gram atomic weight.

The molecular weight of a substance expressed in grams is called molecular weight.

The positive change in the concentration of a reactant or a product per unit time is called the rate of a chemical reaction. Any four factors that affect the rate of a chemical reaction are:

1. The concentration of reactants
2. Temperature
3. Physical nature of reactants
4. Chemical nature of reactants

We know, a chemical reaction in which an acid and base react together to give salt and water is called an acid-base reaction. Here acidic and basic nature et compounds are neutralized. So, it called a neutralization reaction.