substance
a chemical reaction is a reaction were the two chemicals change into a new chemical.
The reaction of chemicals in a battery to power a flashlight is a chemical change. This is because the chemicals in the battery undergo a chemical reaction to produce electricity, which powers the flashlight.
A physical change occur when the molecular structure of chemicals are not changed.A chemical change occur when the molecular structure of chemicals is changed.
A glowstick undergoes a chemical change when the chemicals inside mix, leading to a reaction that produces light. This change cannot be reversed, as the reaction permanently alters the composition of the chemicals inside the glowstick to create the glowing effect.
The chemical reaction is interrupted.
Rusting is the common chemical reaction for iron.
This is a very vague question and would depend on the chemical that you are talking about. The easiest way I can think to explain it on a wide variety of chemicals is by using a catalyst (speeds up the process of a chemical reaction), or the use of an antagonist (Slows a chemical reaction). I hope this helps, but without any specific chemicals being named this is the best i can do. :) By heating we can change the rate of chemical change(reaction).
simply yes, because if you put them together, then the chemicals collide and therefore makes a chemical change.
At least one change in chemical bonding.
what chemical change happens to a green plant
no rusting iron is not a physical change it is a chemical change
A color change can be an indicator of a chemical reaction.