Chemistry

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Across
  1. 1. shared electron pair = ___ pair
  2. 3. a polymer is originated from thousands of ___
  3. 7. caesium reacts more ___ than rubidium does
  4. 9. formula of a stable (2,8,5) molecule
  5. 10. widely used to make containers
  6. 11. ___ number is the sum of the number of p and n in the atom
  7. 13. hazard warning of potassium and sodium, other than flammable
  8. 17. the lowest level of crude oil fractions
  9. 18. smell of sulphur dioxide
  10. 20. plastic foam is produced from polystyrene by adding a foaming ___ while heating it
  11. 21. Na burns with ___ yellow flame
  12. 23. formula of a stable sulphur molecule
  13. 24. crude oil is a mixture of ___ molecules
  14. 28. the formula of a covalent compound shows the ___ of one atom to the other(s) in the molecule
  15. 31. hazard warning of benzene, tetrachloromethane and asbestos
  16. 32. neon glows ___ when electricity passes through it
  17. 33. holds 7.3% in nauter (third highest)
  18. 36. in the periodic table, elements are arranged in order of ___ order of atomic numbers
  19. 37. covalent bond is the strong electrostatic attraction between the shared electrons and two ___ of the bonded atoms
  20. 40. covalent bond with three shared electron pairs
  21. 42. ___ clothes are made from crude oil fractions
  22. 43. short form of what you can do when shopping and buying things
  23. 44. structure of He
  24. 45. study of substances
  25. 46. exception of molecules in compounds
  26. 48. the smallest part of an element or a compound which can exist on its own under room conditions
  27. 49. bond of C-60 molecule
  28. 50. noble gases are ___ gases as they can exist on their own
  29. 57. alkaline ___ metal
  30. 59. ___ oil is a fuel for heavy vehicles
  31. 62. the darker colour it has, the less ___ it is
  32. 65. the more easily it flows, the lower ___ it has
  33. 66. an atom or a group of atoms having an overall electric charge
  34. 67. a metalloid
  35. 68. electro. conducts electricity when _?_ or in ___ solution but not in solid state
  36. 69. on adding sodium _?_ solution, coloured aqueous solution of halog. turn to ___
  37. 71. tin+copper
  38. 72. Reduce, reuse and recycle
  39. 75. plastics affect the cityscape and environmental ___.
  40. 77. Group I elements have low ___ points and boiling points
  41. 79. used to describe how the strong force of ionic bond extends
  42. 82. plastic ___ take 450 years to decompose
  43. 84. crude oil can be separated ___ to different compounds
  44. 85. in the formula for electronic arrangement of atoms, n = ___ number
  45. 86. a kind of non-metal compounds that can form electro. in water
  46. 87. Group I elements are ___ metals that they can be easily cut with a knife
  47. 91. stable, barely react
  48. 92. to make bristles of toothbrushes, fishing nets, ropes and stockings, etc.
  49. 93. the reacitvity of elements ___ down the group
  50. 96. fuel for motor cars
  51. 97. H2S = ___ _?_
  52. 98. elements are classified into ___ and molecules
  53. 101. unshared electron pair = ___ pair
  54. 102. more than one formula
  55. 105. non-metal liquid ion under room conditions
  56. 106. different atoms of the same element which have the same number of protons but different number of neutrons
  57. 107. ___-60 emits high-energy radiation to kill the micro-organisms in fresh fruits
  58. 108. produced in the reaction of lithium and water
  59. 111. the same fraction with heavy oil
  60. 113. period number = number of ___ electron shells
  61. 116. crude oil's separation method belongs to a type of ___ distillation
  62. 118. maximum number of electrons in the 4th electron shell
  63. 119. electric charge of a radium ion
  64. 120. Sn
  65. 121. matter can be classified into ___ substances and _?_
  66. 123. chemical elements or compounds being able to exist on its own
  67. 124. the process of joining many small molecules toether repeatedly to form macro.
  68. 129. electro. conducts electricity when ___ or in _?_ solution but not in solid state
  69. 131. name of a selenium (Se) ion, which is in group V
  70. 133. room temperature (degrees Celcius)
  71. 135. action of ___ slowly changed the sea animals and plants' remains into crude oil
  72. 136. Mg reacts with ___ to produce hydrogen
  73. 139. Group II metals react with dilute ___ acid to form hydrogen
  74. 141. the only exception of Group 0 elements
  75. 142. lead (II) ___ paper can test for hydrogen sulphide gas
  76. 143. ___-135 is used to generate electricity
  77. 144. a hydrogen atom has one proton but zero ___
  78. 145. we can buy ___ products to reduce the plastic we use by using the same bottle to fill shampoo, etc.
  79. 146. ___ petr. gas (LPG)
  80. 147. action of placing francium in air for a long time
  81. 148. on adding sodium ___ solution, coloured aqueous solution of halog. turn to _?_
Down
  1. 1. sodium and potassium form a silvery ___ when they catch water, and move quickly on the water surface
  2. 2. atoms are made up of three fundamental "___ particles"
  3. 4. production for town gas
  4. 5. substances can be classified to conductors, ___ and non-conductors
  5. 6. ionic bonding does not take place between two (2,8,18,18,5) atoms because none of them will ___ any electron
  6. 8. positively charged ion
  7. 9. name of an ion of element P
  8. 12. elements cannot be broken down ___, unlike compounds
  9. 14. appearance of iodine under room conditions (black ___)
  10. 15. ease of evaporation
  11. 16. CH4
  12. 19. about 199 degrees Celcius of crude oil fractions
  13. 22. Cl is a ___ yellow gas
  14. 24. crude oil is very difficult to burn directly. A lot of black smoke and many ___ gases are produced in the combustion process
  15. 25. potassium has a low ___ that it can float on water surface
  16. 26. NaCl is the ___ of two reactants
  17. 27. lightest element in Group VII
  18. 29. noble
  19. 30. reacts steadily with water to form hydrogen
  20. 34. relatively odder one in Group II elements
  21. 35. suffix for the names of monatomic anions
  22. 38. crude oil = ?
  23. 39. all halog. have ___ (e.g. fluorine is a pale yellow gas and astatine is a black solid)
  24. 41. one of the drawbacks of using plastics (land and water ___)
  25. 47. an oil ___ is built to pump the crude oil out
  26. 51. metallic filament in light bulbs
  27. 52. a chemical bond found only in metals
  28. 53. used to make car windows, notice signs and safety goggles
  29. 54. H2S = _?_ ___
  30. 55. when freshly cut, sodium is shiny, but it ___ easily in air
  31. 56. a type of oil where potassium is often stored
  32. 58. tennessine (2,8,18,18,32,32,7) is a ___
  33. 60. symbol of electron
  34. 61. negetively charged ions
  35. 63. structure of elements having 8 outermost shell electrons
  36. 64. to make shampoo bottles, detergent bottles, waste recycling bins, cling film, plastic bags, etc.
  37. 70. covalent bond with one shared electron pairs
  38. 73. elements with ___ outmost shell electrons can exist in both atoms and molecules
  39. 74. the sound of a silvery sodium ball moving around the water surface
  40. 76. chemical bond refers to the strong _?_ attraction, that is, the attracrtion between opposite charges, that holds ___ particles
  41. 78. ability to be beaten into thin sheets
  42. 80. glucose has 3 ___
  43. 81. horizontal row in the Periodic Table
  44. 82. litmus paper turns ___ if it is used to test the alkalinity of sodium and water solution
  45. 83. ionic compounds are formed by ___ electrons
  46. 88. ___-14 dating
  47. 89. overall charge of Naâ‚‚O
  48. 90. plastics shorten the ___ of landfills and reduce land supply
  49. 94. ionic compounds are electrically neutral, or ___
  50. 95. conduction that involves electro.
  51. 99. a thing that forms hydrogen and oxygen when passing through water
  52. 100. abbreviation form of polyehylene terephthalete
  53. 103. K burns with ___ flame
  54. 104. oil ___ is carried out to separate different molecules of crude oil
  55. 109. ___ water must be made up of ony non-metals
  56. 110. number of elements found naturally
  57. 112. polymer such as a polethene molecule
  58. 114. chemical bond refers to the strong ___ attraction, that is, the attracrtion between opposite charges, that holds _?_ particles
  59. 115. opposite of attraction
  60. 117. unit of atmospheric pressure (normally 1)
  61. 118. maximum charge of cation
  62. 119. general formula for crude oil's CH molecules are CnH(___)
  63. 122. gold, silver and copper are ___ elements/ metals
  64. 125. caesium,rubidium, etc.
  65. 126. opposite of deposition
  66. 127. the only non-metal that conducts electricity in solid state without any chemical changes during conduction
  67. 128. matter can be classified into _?_ substances and ___
  68. 130. Xe
  69. 132. exception of molecules in elements other than graph.
  70. 134. ___ gas is often found with crude oil
  71. 136. covalent compounds are formed by ___ the outermost electrons with each other
  72. 137. maximum number of bonding electrons
  73. 138. most raw materials for making plastics are ___ from naph.
  74. 140. hazard warning of chlorine water