Question

In what kind of reaction do two or more substances combine to form a new compound

Answer 1

Combination or synthesis

Step-by-step explanation:

In combination or synthesis, there is formation of a single product from two or more reactants e.g:

H₂ + I₂ → 2HI

Here a compound forms from the association of the consituent elements.

Other kinds of chemical reactions we have are:

1. Decomposition or cracking
2. Single replacement or single displacement
3. Double replacement or double decomposition or metathesis.