The atoms are of each starting substances are only rearranged.
when two substances react a chemical change occurs
A chemical change occurs when this happens.
chemical change
Chemical Change.
The substances you have at the beginning of a chemical reaction are called the reactants.
a chemical change occurs
chemical
No. That is a chemical change. In a physical change, their is no change in chemical composition forming one or more new substances.
A chemical change.
A chemical change.Why?This is because in a chemical change the chemical formula is edited. While it is edited, compounds may be formed.This answer was written in 2009 and may be subject to change due to future discoveries. It is not the fault of whoever answered this that this may be wrong in future discoveries.
This is a chemical change; but be aware that sometimes the modification of physical characteristics involve a change of material properties.
Chemical reactions, normally. However, radioactivity, nuclear fission, or nuclear fusion also fit this definition.