A reaction in which two or more substances combine to give a new compound is called ____________ reaction.

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Solution

1. Combination reaction:
Reaction in which two or more reactants combine to form a single product. $A + B \to AB$
2. Example:
$H_{2} (g) + {Br}_{2} (l) \to 2 HBr (g)$
Hydrogen Bromine Hydrogen bromide
Here hydrogen and bromine are combined and form hydrogen bromide.
Hence, A reaction in which two or more substances combine to give a new compound is called combination reaction.

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(a) A reaction in which two or more substances combine to form a single substance is called a ___ reaction.

(b) A ___ is a substance which changes the rate of a chemical reaction without undergoing a chemical change.

(d) The reaction between an acid and a base is called ___

(e) Soluble bases are called ___

(f) The chemical change involving iron and hydrochloric acid illustrates a ___ reaction.

(g) In the type of reaction called ___ two compounds exchange their positive and negative radicals respectively.

(h) A catalyst either ___ or ___ the rate of a chemical change but itself remains ___ at the end of the reaction.

(i) The chemical reaction between hydogen and chlorine is a ___ reaction

(j) When a piece of copper is added to silver nitrate solutuions, it turns ___ in colour.

In a ______________ reaction two or more substances combine to form a new single substance.

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