Chemistry terms practice 1

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Across
  1. 3. matter that has a definite shape and volume
  2. 5. 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
  3. 6. a starting substance in a chemical reaction
  4. 7. that portion of chemistry dealing with numerical relationships in chemical reactions; the calculation of quantities of substances involved in chemical equations
  5. 9. any member of the nonmetallic elements in Group 7A of the periodic table
  6. 10. vaporization that occurs at the surface of a liquid that is not boiling
Down
  1. 1. a substance formed in a chemical reaction
  2. 2. one of two or more different molecular forms of an element in the same physical state
  3. 3. the conversion of a solid to a gas or vapor without passing through the liquid state
  4. 4. a substance in the gaseous state that is ordinarily a liquid or solid at room temperature
  5. 5. a substance that can be separated into simpler substances (elements or other compounds) only by chemical reactions
  6. 8. a vertical column of elements in the periodic table; the constituent elements of a group have similar chemical and physical properties