Question

define a chemical reaction give one example

Answer 1

Interaction of two or more chemicals that produces one or more new chemical compounds, or alters the properties of the mixed chemicals. Most reactions require heat, pressure, radiation, other conditions, and/or the presence of accelerators (catalysts).
eg: 2nacl+h2so4→na2so4+2hcl.

Answer 2

Answer:

A chemical reaction happens when one or more chemicals are changed into one or more other chemicals. Examples: iron and oxygen combining to make rust. vinegar and baking soda combining to make sodium acetate, carbon dioxide and water.