Physical Science Vocab 4B

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