Chemistry - Lower Secondary - Grade 8 - Book 9

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Across
  1. 2. when solid formes when two liquid reacts
  2. 5. A type of bond where electrons are transferred from one atom to another
  3. 6. Cylindrical glass container
  4. 10. this has a melting point of 1535 degree celcius
  5. 12. salts formed using citric acid
  6. 13. green and purple (48 - 83) (Hint: formula)
  7. 16. The process by which a solid changes directly into a gas (Hint: S----)
  8. 18. zero is the melting point of this
  9. 20. other name for group 7 family
  10. 23. VANLECOT
  11. 24. when metals become liquid we say this
  12. 25. when copper sulfate reacts with iron -- what type of reaction
  13. 27. an element and a planet
  14. 30. A chemical reaction in which heat is absorbed from the surroundings
  15. 32. Fe + S
  16. 36. greater the temperature, ________ the rate of reaction
  17. 40. this stuff is used to make blackboard chalk
  18. 41. this is flurine family and it is brown in colour
  19. 42. this macromolecule is present in pencil
  20. 46. (63 - 1 - 11; --- ; 197 - 4 - 4; 275 - 1 - 22; 274 - 1 - 3; 63 - 1 - 11; --- ;)
  21. 47. when less pH solution reacts with more pH solution this reaction happens
  22. 48. hardest non metal (D---)
  23. 49. this is below the element which has melting point -270 and boiling point -269
Down
  1. 1. very high reactive
  2. 3. The process of a liquid changing into a gas at the surface
  3. 4. S
  4. 7. three dimension arrangement of atoms
  5. 8. 199 - white colour equipment where heat is applied
  6. 9. pop sound
  7. 11. A state of matter with a definite shape but no fixed volume
  8. 12. The study of the structure, properties, and behavior of matter
  9. 14. A substance made up of two or more elements chemically combined
  10. 15. this rock is made of calcium carbonate
  11. 17. use your LB to find this word (246 – 3 – 7 ; 197 – 6 – 37; 21 – 14 – 10; 211 – 1 – 14; 132 – 12 – 16) (Hint: Letters may be jumbled)
  12. 19. when carbonate salt reacts with acids this substance is produced
  13. 21. A metal's tendency to lose electrons in chemical reactions
  14. 22. high high exothermic reaction (Hint: train track)
  15. 24. its melting point is -182 and boiling point us -161
  16. 26. Purple - 54
  17. 28. this shows no reaction
  18. 29. 172 - metal responsible for blue colour
  19. 31. The process of converting a gas into a liquid
  20. 33. overall theme in 180
  21. 34. OETACBANR (Jumbled)
  22. 35. these compound conduct electricity
  23. 37. Has no net electric charge
  24. 38. the steepness of a slope, including on a graph
  25. 39. In graph one of the point does not fit the pattern is called _______ result
  26. 43. A substance that cannot be broken down by chemical means
  27. 44. A type of solid with an ordered, repeating pattern of particles
  28. 45. A form of matter that has a definite shape and volume