Across
- 2. an equation where the number of atoms of each type in the reaction is the same on both reactants and product sides
- 4. a substance made by mixing other substances together
- 6. substances breakdown into simpler substances
- 7. the basic unit of a chemical element
- 8. a subatomic particle found in the nucleus of every atom except that of simple hydrogen
- 11. the number in front of the formula
- 13. a substance whose atoms all have the same number of protons
- 14. Atoms with the same number of protons but different numbers of neutrons
- 16. a type of subatomic particle with a positive charge
- 18. anything that has weight and takes up space
- 20. a class of substances characterized by high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light.
Down
- 1. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
- 3. Chemical reactions that release energy
- 5. a substance that is formed as the result of a chemical reaction
- 9. a chemical change which forms new substances
- 10. A reaction that absorbs energy
- 12. tiny, negatively charged particles in an atom that move around the positive nucleus at the center
- 15. a number, or variable, that is written in small script at the top right of another number or a variable
- 17. the composition or combination of parts or elements so as to form a whole
- 19. the amount of matter present in any object