Question

. (a) What is a catalyst?


(b) Name the four types of chemical reactions. ​

Answer 1

Answer:

(a) A substance that makes a chemical reaction happen faster.

(b) Combination, decomposition, displacement reaction, Combustion

Hope it will help u...

Answer 2

Catalyst :

❖ The substance which increase the rate of change of reaction without consuming itself is known as catalyst.

• Example : Nickel and vanadium are the common catalyst.

Chemical reaction :

❖ There are four types of chemical reaction :-

1. Combination reaction :- The reaction in which two or more elements or compounds combine to form a new compound is known as combination reaction.
2. decomposition reaction :- The reaction in which a compound decomposes into two or more substances is known as decomposition reaction.
3. displacement reaction :- The reaction in which one element replace the another element from a compound is known as displacement reaction.
4. Double displacement reaction :- The reaction in which the parts of two ions compounds are exchanges and two new compounds are formed is known as double displacement reaction.