Chemistry crossword

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Across
  1. 3. How close to the true value results are
  2. 7. There are 118 of them
  3. 11. Solid, liquid, gas
  4. 13. When a gas substance forms a solid
  5. 14. The 16th element
  6. 15. Made of copper and tin
  7. 18. A slow chemical reaction between metal and oxygen that makes metal oxide
  8. 20. How close to each other the results are
  9. 23. Water and carbon dioxide react through sunlight
  10. 24. A chemical process where a substance gives off heat
  11. 25. Turning a solid into liquid
  12. 26. One of the smallest things
  13. 27. Created when two or more metals are combined
  14. 28. number The amount of protons and neutrons in an atom
  15. 29. An ingredient in air
Down
  1. 1. Able to be stretched into a wire
  2. 2. It means that something can be hammered into a sheet without cracked
  3. 4. A liquid turning into a solid
  4. 5. How heavy is it for its size
  5. 6. silver Made of silver and copper
  6. 8. A substance dissolved in a solution
  7. 9. The first element on the periodic table
  8. 10. Having a Ph level of less than 7
  9. 11. The construction of complex compounds from simpler ones
  10. 12. Acid A liquid made with Hydrogen
  11. 16. The 92nd element on the periodic table that has high radioactivity
  12. 17. Shiny
  13. 19. A chemical reaction between hydrocarbon and oxygen releasing heat and light
  14. 21. Reaction between oxygen and sugar
  15. 22. It is used by the human body