Science 9 Croosword puzzle

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Across
  1. 5. always use a _____ to clean up broken glass
  2. 6. causes burns to skin, eyes, lungs, clothes and metal.
  3. 8. materials caising toxic effects
  4. 10. can burn or explode if heated
  5. 12. any part of the experiment that is subjet to change
  6. 14. proper face to smell a substance
  7. 15. one of the four safety rules
  8. 17. Workplace hazardous materials information system
  9. 18. A circle containing a skull and crossbones is the WHMIS symbol for?
  10. 20. what you measure in the experiment and what is affected during the experiment
Down
  1. 1. may cause it's container to explode if heated or dropped
  2. 2. any infectious materials including blood,urine and saliva
  3. 3. a substance that burns at room temperature or burns if heated above room temperature
  4. 4. a variable that is manipulated to determine the value of a dependent variable
  5. 7. A circle containing a flaming “O” is the WHMIS symbol for?
  6. 9. something that is not being tested, for it's being used in comparison
  7. 11. remember to do this when you have finish your lab
  8. 13. should always be worn while doing a lab
  9. 16. an educated guess
  10. 19. a substance that gives off oxygen to help other substances burn