Friday, June 8, 2012

Answers to all Test yourself Questions (HODDER, EDEXCEL AS CHEMISTRY)

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Answers to Topic 1 Test yourself questions


 1  a) The more reactive metal displaces the less reactive metal from its compound, e.g.
Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)
      b) a metal or hydrogen
      c) Carbon dioxide is produced.
           acid + carbonate → metal compound (salt)+ carbon dioxide + water
      d) They are all white crystalline solids.
 2  a) copper, steel
      b) salt, limestone
      c) ice, sugar
 3  a) C2H6O2
      b) CH3O
 4  a)

b)           

     


5  a) hydrogen and sulfur, H2S
      b) chlorine and oxygen, Cl2O
      c) hydrogen and nitrogen H3N or NH3
 6  Because Al(OH)3 contains one Al atom combined with 3 O atoms and 3 H atoms, whereas AlOH3 would contain one Al atom combined with only one O atom and 3 H atoms.
 7  a)   (K+)2SO42− or K2SO4
b)  (Al3+)2(O2−)3 or Al2O3,
c)   Pb2+CO32− or PbCO3
d)  Zn2+(OH)2 or Zn(OH)2
e)   (Fe3+)2(SO42−)3 or Fe2(SO4)3
 8  Molecules: a) octane, c) pure sulfuric acid,
e) phosphorus trichloride
      Ions: b) copper(i) oxide, d) lithium fluoride
 9
Non-metal (molecular) compounds
Metal/non-metal (ionic) compounds
      a)
low melting temperatures and boiling temperatures
high melting temperatures and boiling temperatures
      b)
do not conduct electricity as liquids
conduct electricity as liquids



10  a) CH4 + 2O2 → CO2 + 2H2O
b)
(10b)
 



11  a) 4Na + O2 → 2Na2O
      b) Na2O + H2O → 2NaOH
      c) H2 + Cl2 → 2HCl
      d) Zn + 2HCl → ZnCl2 + H2
      e) CH4 + 2O2 → CO2 + 2H2O
      f)  2Fe + 3Cl2 → 2FeCl3
12  a) hydrogen ions, H+(aq) and nitrate ions NO3(aq)
      b) hydrogen ions, H+(aq) and sulfate ions, SO42(aq)
13  a) Zn + H2SO4 → ZnSO4 + H2
      b) CaO + 2HNO3 → Ca(NO3)2 + H2O
      c) Na2CO3 + 2HCl → 2NaCl + CO2 + H2O
14  a) Zn + 2H+ + SO42 Zn2+ + SO42 + H2
           Zn + 2H+ → Zn2+ + H2
      b) Ca2+O2 + 2H+ + 2NO3 
Ca2+ + 2NO3 + H2O
           O2 + 2H+  → H2O
      c) 2Na+ + CO32 + 2H+ + 2Cl 
2Na+ + 2Cl + CO2 + H2O
           CO32 + 2H+ → CO2 + H2O
15  a) 12
      b) 2
      c) 8
      d) 3
      e) 4
16  a) 71
      b) 256.8
      c) 46
      d) 154
17  a) 95.3
      b) 159.6
      c) 249.6
18  a) 0.5mol
      b) 0.05mol
      c) 1mol
      d) 0.1mol
      e) 0.25mol
19  a) 12.69g
      b) 17.75g
      c) 36.0g
      d) 0.535g
      e) 12.0g
20  a) 2mol
      b) 1mol
      c) 4mol
21  a) 3 ´ 1023
      b) 24 ´ 1023  = 2.4 ´ 1024
      c) 54 ´ 1023 = 5.4 ´ 1024
22  a) 0.112 ´ 103g Fe3+ and 12.4 ´ 103g NO3
      b) 0.002 ´ 103mol Fe3+ = 2 ´ 106mol Fe3+ and 0.2 ´ 103mol NO3 
           = 2 ´ 104mol NO3
      c) 12 ´ 1017  = 1.2 ´ 1018 Fe3+ ions and 1.2 ´ 1020 NO3 ions
23  a) CH4
      b) VCl4
      c) Na2SO4
24  a) CuFeS2
      b) H2SO4
      c) C2H6O
25  14.0g
26  2.02g
27  0.33kg
28  a) 10mol
      b) = 2 ´ 10−3mol
      c) = 0.125mol
29  a) 48000cm3
      b) 4.8cm3
      c) 3000cm3
30  a) 1dm3
      b) 175cm3 O2 forming 100cm3 CO2
31  a) C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
      b) 1000cm3 O2 forming 600cm3 CO2
      c) ´ 12gmol1 = 0.3g CO2


32  a) 0.01mol Zn gives 240cm3 H2
      b) 0.02mol KNO3 gives 0.01mol O2 = 240cm3 O2
33  a) 0.05moldm3
      b) 0.4moldm3
      c) 0.625moldm3
34  a) ´ 2 = 0.1mol H2SO4 Þ 9.81g H2SO4
      b) ´ 0.01
           = 103mol KMnO4 Þ 0.158g KMnO4
      c) ´ 0.2
           = 0.05mol Na2CO3 Þ 5.3g Na2CO3
35  1000cm3 of mineral water contains 0.133g of hydrogencarbonate.
      1000g of mineral water contains 0.133g of hydrogencarbonate
      Concentration in ppm =´ 106 = 133
36  1mol Fe2O3 → 2mol Fe
      159.6g Fe2O3 → 111.6g Fe
      1000kg Fe2O3 →´ 1000kg Fe = 699kg Fe
      Theoretical yield = 699kg
      % yield == 90%
37  1mol CaO → 1mol Ca(OH)2
      56.1g CaO → 74.1g Ca(OH)2
      500kg CaO →´ 500kg Ca(OH)2 
      = 660kg Ca(OH)2
      Theoretical yield = 660kg
      % yield =´ 100 = 93.9%
38  a) Atom economy
           =´ 100
           =´ 100 = 100%
      b) Atom economy =´ 100 = 51.1%
      c) Atom economy =´ 100 = 68%

2 comments:

  1. nice work there.
    Where can i get the answers to test yourself topic 14 ? Please help

    ReplyDelete
  2. Dude, where can i get answers of other chapters?

    ReplyDelete