Question

1. Fill in the blanks :
(a) A reaction in which two or more
substances combine to form a single
substance is called a .................... reaction.
(6) A
A .... .......... is a substance which
changes the rate of a chemical reaction
without undergoing a chemical change​

Answer 1

Hey Mate!

Here are your answers :

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

And,

A CATALYST is a substance which changes the rate of a chemical reaction

without undergoing a chemical change​.

Hope it helps :-)

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Answer 2

Explanation:

1.a combination

6.a Catalysts