Science Vocabulary I

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Across
  1. 3. the act of pressing together
  2. 5. the rubbing of one object or surface against another
  3. 6. a force that tends to oppose or slow down motion
  4. 9. something that has a pH above 7.0
  5. 11. the natural force of attraction exerted by the earth
  6. 12. a push or a pull
Down
  1. 1. the act of stretching
  2. 2. increasing speed
  3. 4. the symbol relating to hydrogen ion (H+) concentration. Below 7.0 is acidic and above 7.0 is alkaline
  4. 7. a statement showing the equality of two mathematical expressions, or a representation of a chemical reaction
  5. 8. a substance that causes or accelerates a chemical reaction without itself being affected
  6. 10. something that has a pH below 7.0