Matter: Properties and Changes

6. the mass per unit volume of a substance
7. a number placed in front of an element symbol or chemical formula in an equation
12. law that states that the total mass of reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction
13. a process in which atoms of one or more substances rearrange to form one or more new substances
15. more energy is required to break the bonds of the reactants than is released when the products form.
16. occurs when a substance reacts with another substance, changing it into a new substance
18. a characteristic of matter that can be observed or measured without changing the identity of the matter

1. a change in matter in which the substances that make up the matter change into other substances with different chemical and physical properties
2. a substance produced by a chemical reaction
3. the energy released when atoms form bonds
4. more energy is released when the products form than required to break the bonds in the reactants
5. law that states that energy is always transferring, but energy is not created or destroyed.
8. a starting substance in a chemical reaction
9. the ability of a type of matter to burn easily
10. occurs when substances react t oxidizing agents, changing it to a new substance
11. the amount of matter in an object
14. a characteristic of matter that can be observed as it changes to a different type of matter
17. the amount of space a substance takes up