Chemistry terms part 3

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Across
  1. 7. a starting substance in a chemical reaction
  2. 8. that portion of chemistry dealing with numerical relationships in chemical reactions; the calculation of quantities of substances involved in chemical equations
  3. 9. describes the closeness, or reproducibility, of a set of measurements taken under the same conditions
  4. 10. matter that has a definite shape and volume
  5. 11. the space occupied by a sample of matter
  6. 13. a substance formed in a chemical reaction
Down
  1. 1. the conversion of a solid to a gas or vapor without passing through the liquid state
  2. 2. a thoroughly tested model that explains why experiments give certain results
  3. 3. a substance in the gaseous state that is ordinarily a liquid or solid at room temperature
  4. 4. a measure of the average kinetic energy of particles in matter
  5. 5. a positively charged subatomic particle found in the nucleus of an atom
  6. 6. a quantum of light, a discrete bundle of electromagnetic energy that behaves as a particle
  7. 9. a horizontal row of elements in the periodic table
  8. 12. a substance that increases the rate of reaction by lowering the activation-energy barrier; it speeds up a chemical reaction without being consumed in the process