Heat can alter a substance into another substance. Such as when you bake a cake the batter is changed into a cake and can not be changed back.
a physical change
This is called a physical change.
catalyst
A pollutant is a substance that alters the composition of its surroundings.
A physical change.Changes between Solid, Liquid, and Gas.
alters the central nervous system
It is considered a physical change. A chemical change involves chemical reactions that change the substance into another substance. A physical change typically only modifies the form or phase.
the rate of the reaction can be increased or decreased
No. For example, ice to water.
These are called catalysts.
A chemical that alters the apparent color of a substance is a dye.
These are called catalysts.