Chemistry Project

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Across
  1. 3. Xe
  2. 4. A substance which can't be further divided into simpler substances like chemical methods.
  3. 7. Source of life.
  4. 8. Rain which has been made more acidic than normal.
  5. 9. Toxic metal that can cause learning difficulties in children.
  6. 12. When liquid changes to gas.
  7. 14. A type of chemical reaction where a compound breaks down into simpler substances.
  8. 18. A substance formed by the chemical combination of two or more elements in fixed proportions.
  9. 20. Composes 21% of the atmosphere.
  10. 25. Type of rock that cover three - quarters of the land surface.
  11. 26. A state of matter that has a definite shape.
  12. 29. A common natural gas that is contain in your fart.
  13. 30. Paper ________ was used to separate solutions of coloured substance.
  14. 32. A chemical reaction in which a compound is made from its elements.
  15. 36. U.
  16. 37. Natural cycle by which rocks are possibly changed into another type of rock by conditions of temperature and pressure.
  17. 38. The system by which nitrogen and its compound are interchanged.
  18. 40. It is form from the buried remains of plants and animals.
  19. 41. Composes 0.04% of the atmosphere.
  20. 43. Seawater is made drinkable by ________.
  21. 47. Most reactive group of non-metals.
  22. 50. A process in which heat energy is produced and released to the surrounding.
  23. 51. Type of rock form by heat and pressure changing existing rocks.
  24. 52. A class of chemical element which have a characteristic shiny appearance and are good conductors of heat and electricity.
  25. 53. A vertical column of the periodic table containing elements with similar properties.
  26. 55. Sources of energy and other resources which cannot run out.
  27. 56. The separation of a solid from a liquid, using a fine filter paper which does not allow the solid to pass through.
  28. 57. The solid substance that has dissolve in liquid to form a solution.
  29. 59. Substance that can be used as a source of energy.
  30. 60. First element in the periodic table.
Down
  1. 1. Atom of the same element which have different numbers of neutrons in their nuclei.
  2. 2. Changes of physical state from liquid to solid.
  3. 5. Separating a liquid from a solution.
  4. 6. A from of calcium carbonate (CaCO3)
  5. 10. Materials we get from the environment to meet our needs.
  6. 11. _________ is the process in which plants take in C02 and convert it to sugar.
  7. 13. Creator of the periodic table.
  8. 15. A word used to describe the property that metals that can be drawn out and stretched into wires.
  9. 16. Type of rock form by solidification of melted minerals.
  10. 17. Mixtures of elements design to have the properties useful for a particular purpose.
  11. 19. Changes of physical state from solid to liquid.
  12. 21. Anything which occupies space and has mass.
  13. 22. The system by which carbon and its compounds in the air ocean and rocks are interchanged.
  14. 23. A class of chemical element that are typically poor conductors of heat and electricity.
  15. 24. Zr.
  16. 27. Harmful effect of human activity and waste.
  17. 28. Sources of energy that cannot be replaced.
  18. 31. The system by which water circulates around the earth.
  19. 33. A direct change of state from solid to gas or gas to solid.
  20. 34. H20
  21. 35. Water is a type of this state of matter.
  22. 39. The ________ is measured by a thermometer.
  23. 41. Liquéfaction.
  24. 42. P.
  25. 44. A subatomic particle that is located in energy levels outside the nucleus.
  26. 45. Substance which increases the rate of a chemical reaction.
  27. 46. NH3
  28. 48. A state of matter that doesn't have a fix volume.
  29. 49. A horizontal row of the periodic table.
  30. 51. A word used to describe the property that metals can be bend and beaten into sheets.
  31. 52. Semi-metal.
  32. 54. The liquid that dissolves the solid solute to form a solution.
  33. 58. Our favorite food ;)