Chemical changes

                                                                              Vocabulary#7
physical changes: a change in size,shape,or state,without forming a new substance.

chemical change: a change in matter that produces a new substances a new substance with different properties from the original.
chemical reaction: a chemical change of original substances into one or more new substances.

reactant: one of the original substances before a chemical reaction takes place.

product: one of the new substances produced when a chemical reaction takes place.