Science

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Across
  1. 4. a black coating of silver sulfide that is produced when silver reacts with sulfur in food or the atmosphere; chemical formula Ag2S
  2. 5. a green coating of copper hydroxide that is produced when copper reacts with moisture, carbon dioxide and oxygen in the atmosphere; chemical formula Cu(OH)2
  3. 7. the process that breaks down large molecules in food into smaller ones that can be absorbed by the body
  4. 10. a term used to describe materials that store carbon in their structures
  5. 13. highly combustible chemicals
  6. 14. combustion that occurs when there is plenty of oxygen; it produces carbon dioxide and water vapour
  7. 15. respiration a reaction that uses oxygen to release energy stores in glucose
  8. 17. structures on roots and stems that allow gas exchange to take place
  9. 19. 10 hydrated iron oxide; chemical formula Fe2O3.H2O
  10. 20. a chemical reaction that releases energy
  11. 21. a helper chemical that speeds up chemical reactions in living things
  12. 22. a chemical reaction that absorbs energy
  13. 24. a chemical equation that has the same number of each type of atom on both sides of the arrow
  14. 25. the movement of chemicals from an area of high concentration an an area of low concentration
  15. 27. endothermic reaction that takes place in green plants
  16. 28. chemicals that take part in a chemical reaction; they are written on the left-hand side of the arrow
  17. 29. rain that has acids such as nitric acid and sulfric acid dissolved in it
Down
  1. 1. a series of chemical reactions that releases energy from glucose it takes place in the mitochondria inside cells
  2. 2. a way of protecting aluminium from corrosion, by deliberately creating a layer of aluminium oxide over it
  3. 3. equation simple written description of what is happening in the reaction
  4. 6. chemicals produced in a chemical reaction; they are written on the right-hand side of the arrow
  5. 8. a rapid reaction with oxygen that releases energy in the form of heat and/or light
  6. 9. atoms are not created or destroyed in a chemical reaction; they can only be rearranged
  7. 11. a reaction of an acid with a base, forming a salt and water
  8. 12. a simple sugar produced by photosynthesis; chemical formula C6H12O6
  9. 16. combustion that occurs when oxygen is limited; produces carbon and carbon monoxide, and does not release as much heat or light as complete combustion
  10. 18. the term commonly used for sodium chloride
  11. 23. the green chemical found in the chloroplasts of green plants that traps the Sun's energy for photosynthesis
  12. 26. the breakdown of metals due to their reaction with other chemicals