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4. a chemical reaction in which one element replaces another in a compound.
5. a mathematical sentence that has two equal sides separated by an equal sign.
8. the process by which dead organic substances are broken down into simpler organic or inorganic matter
10. Chemical reactions that absorb (or use) energy overall
15. a system for arranging the chemical elements.
17. the appearance or form of the matter changes but the kind of matter in the substance does not.
19. formed by the equal sharing of electrons from both participating atoms

1. the production of chemical compounds by reaction from simpler materials
2. a reaction in which energy is released in the form of light or heat.
3. occur when parts of two ionic compounds are exchanged, making two new compounds
6. one of the first chemical reactions intentionally controlled by humans.
7. a chemical element (such as boron, carbon, or nitrogen) that lacks the characteristics of a metal.
9. the starting materials in a reaction that undergo a chemical change to form a product.
11. opaque, lustrous elements that are good conductors of heat and electricity.
12. any change that causes a new substance to be formed.
13. a subatomic particle with a positive electrical charge
14. a measure of how readily a substance undergoes a chemical reaction.
16. the measurement of how tightly a material is packed together.
18. Ionic bonds result from the attraction between oppositely charged ions.