Across
- 3. when two or more substances chemically combine and form a new substance
- 6. when more than one atom chemically combines
- 8. alters the form of a substance but does not change it into a new substance with new properties
- 10. positive and is in the nucleus
- 11. a substance that is made of two or more elements chemically combined. Can only be broken apart by chemical reaction
- 13. a characteristic that can be observed or measured. Ex: texture
- 17. smallest unit of an element
- 19. neutral and in the nucleus
- 20. negative and goes around the nucleus
Down
- 1. a characteristic that enables a substance to undergo a chemical change. Ex: flammability
- 2. first to discover atoms
- 4. greek word means indivisible
- 5. vertical columns on the periodic table that are organized by similar properties
- 7. the amount of matter in a chemical reaction does not change, so the total mass of the reactants must equal the total mass of the products
- 9. a substance that is made up of only one kind of atom
- 12. the # of protons and neutrons in the nucleus
- 13. new substances that are made during the reaction
- 14. the process of one or more substances converting to form new substances with different properties
- 15. materials that are needed to start the chemical reaction
- 16. center of an atom that contains protons and neutrons
- 18. horizontal rows on the periodic table that are organized by atomic #