Chemistry Revision 2020 SIMON

  1. How is an element in the periodic table labelled?
    Image Upload 1
  2. The hypothesis that chemical substances are made of atoms is motivated by the observation that....
    ...compounds result when elements combine in simple, fixed proportions
  3. Equal volumes of gases (at the same temp + pressure) have equal numbers of...
    Gas molecules
  4. Equation that relates the energy of a photon to its frequency
  5. Simple diagram explaining constructive and destructive interference between two waves of identical frequency and amplitude
    .
  6. Oxidation of pyriteImage Upload 2How many moles of H+ will be generated from the oxidation of 3.7g of pyrite? Atomic masses: Fe = 55.9, S = 32, H = 1
    chart?chf=bg,s,00000000&cht=tx&chl=%5Cfrac%7B3.7g%20FeS2%7D%7B1%7D%20*%20%5Cfrac%7B1mol%20FeS2%7D%7B119.9%7D%20*%20%5Cfrac%7B2molesH%2B%7D%7B1molFeS2%7D%20%3D%200.062%20molH%2B&chs=722x74
  7. Photosynthesis: chart?chf=bg,s,00000000&cht=tx&chl=CO_2%20%2B%20H_2O%20%3D%20CH_2O%2B%20O_2&chs=398x36
    How many grams of CO2 will be consumed by the production of 1kg of biomass? Atomic masses: C = 12, O = 16, H = 1
    chart?chf=bg,s,00000000&cht=tx&chl=%5Cfrac%7B1kg%20CH_2O%7D%7B1%7D%20*%20%5Cfrac%7B1000g%7D%7B1kg%7D%20*%20%5Cfrac%7B1molCH_2O%7D%7B30g%20CH_2O%7D%20*%20%5Cfrac%7B44gCO_2%7D%7B1molCO_2%7D%20%3D%201467gCO_2&chs=794x82
  8. Seawater has a salinity of 3.5 x 10^-2 mg NaCl per mm^3. What is the concentration of NaCl in moles/L? Atomic masses: Na = 23, Cl = 35.5
    Image Upload 3
  9. A mineral has the composition Fe (46.6%) and S (53.4%). What is the chemical formula of the mineral? Atomic masses: Fe = 55.9, S = 32
    • Assume you have 100g of the mineral then:
    • 46.6/55.9 = 0.833 mol Fe
    • 53.4/32 = 1.66 mol S
    • 1.66/0.833 ≃ 2

    Formula: FeS2
  10. How many molecules of CO2 are in 1g of CO2? Avogadro's number = 6.022 x 10^23
    chart?chf=bg,s,00000000&cht=tx&chl=%5Cfrac%7B1gCO_2%7D%7B1%7D%20*%20%5Cfrac%7B1molCO_2%7D%7B44gCO_2%7D%20*%20%5Cfrac%7B6.022*10%5E2%5E3%7D%7B1mol%7D%20%3D%201.37*10%5E2%5E2&chs=608x82
  11. A substance is oxidised when it...
    Loses electrons
  12. A substance is reduced when it...
    Gains electrons
  13. In the following reaction is Mn oxidised or reduced?
    chart?chf=bg,s,00000000&cht=tx&chl=MnO_2%20%2B%202H_2S%20%3D%20MnS%20%2B%20S%20%2B%202H_2O&chs=526x36
    Mn is reduced
  14. What is the oxidation state of sulfur in (SO4)2-?
    +6
  15. What is the oxidation state of Fe in Fe2O3?
    +3
  16. What is the oxidation state of As in (AsO3)-3?
    +3
  17. The pK for the half-reaction chart?chf=bg,s,00000000&cht=tx&chl=MnO_2%20%2B%204H%5E%2B%20%2B%202e%5E-%20%3D%20Mn%5E2%5E%2B%20%2B%202H_2O&chs=562x42 is -41.4. What is the pe of a lake of water in equilibrium with MnO2 at pH 6 with a dissolved Mn2+ concentration of 10^-5 m?
    • pe = 11.2
    • Working:
  18. The pK for the half-reaction chart?chf=bg,s,00000000&cht=tx&chl=Cu%5E2%5E%2B%20%2B%20e%5E-%20%3D%20Cu%5E%2B&chs=266x32 is -2.7. What is the pe of a lake of water in equilibrium with [Cu2+]/[Cu+] = 1?
    Working:

    chart?chf=bg,s,00000000&cht=tx&chl=pCu%5E%2B%20-%20pCu%5E2%5E%2B%20-%20pe%20%3D%20-2.7&chs=408x36

     chart?chf=bg,s,00000000&cht=tx&chl=%5Cfrac%7B%5BCu2%5E%2B%5D%7D%7B%5BCu%5E%2B%5D%7D%20%3D%201&chs=150x88

     chart?chf=bg,s,00000000&cht=tx&chl=%5BCu%5E2%5E%2B%5D%20%3D%20%5BCu%5E%2B%5D&chs=242x40

    chart?chf=bg,s,00000000&cht=tx&chl=pCu%5E2%5E%2B%20%3D%20pCu%5E%2B&chs=234x36

    chart?chf=bg,s,00000000&cht=tx&chl=-pe%20%3D%20-2.7&chs=174x34

    chart?chf=bg,s,00000000&cht=tx&chl=pe%20%3D%202.7&chs=118x34
  19. Work out the electronic configuration for Al (atomic number 13).
    chart?chf=bg,s,00000000&cht=tx&chl=1s%5E22s%5E22p%5E63s%5E23p%5E1&chs=238x36
  20. Work out the electronic configuration for P (atomic number 15).
    chart?chf=bg,s,00000000&cht=tx&chl=1s%5E22s%5E22p%5E63s%5E23p%5E3&chs=240x36
  21. Work out the electronic configuration for Ti (atomic number 22).
    chart?chf=bg,s,00000000&cht=tx&chl=1s%5E22s%5E22p%5E63s%5E23p%5E64s%5E23d%5E2&chs=340x42
  22. Sulfur can lose 6 electrons to adopt a closed shell configuration and a +6 oxidation state. Why won't oxygen lose 6 electrons to get the closed-shell configuration?
    Oxygen is too electronegative.
  23. Out of O, Cl, S, C, Si, Mg and Ca, which pair of atoms should form the most ionic bond?
    • O-Ca
    • O-Mg
  24. Out of O, Cl, S, C, Si, Mg and Ca, which pair of atoms should form the most covalent bond?
    • Any like pair (e.g.O-O)
    • Any adjacent pair (e.g. O-Cl or C-S)
  25. Predict which ions might substitute for Fe2+ in olivine.
    Ni2+, Co2+ and several other 2+ transition metals.
  26. Draw the Lewis structure for CH4.
    Image Upload 4
  27. Draw the Lewis Structure for NH3.
    Image Upload 5
  28. Draw the Lewis structure for SiF4.
    Image Upload 6
  29. For chart?chf=bg,s,00000000&cht=tx&chl=MnO_2%20%2B%20e%5E-%20%2B%20H%5E%2B%20%3D%20MnOOH&chs=448x42 write an expression for pe in terms of pH and pK.
    • pK = -pe - pH
    • pe = -pK - pH
  30. Using Pauling's 1st rule, try to predict the coordination number of the cations in CaO.
        Ca Coordination Number      
    Oxygen coordination number   6 7 8 12
      2 0.74 0.79 0.83 0.99
      4 0.72 0.77 0.81 0.97
      6 0.71 0.76 0.80 0.96
      8 0.70 0.75 0.79 0.94
  31. MgO adopts the NaCl/B1 structure. There are 4 formula units in each unit cell. Using the ionic radii of Mg2+ (VI) and O2- (VI) preditc the density of Mgo. Atomic masses: Mg = 24.3, O = 16
    • p = m/v
    • Mass:
    • chart?chf=bg,s,00000000&cht=tx&chl=%5Cfrac%7B4(24.3g%2Fmol%20%2B%2016g%2Fmol)%7D%7B6.023%20*%2010%5E2%5E3%7D&chs=336x80

    • Volume:
    • chart?chf=bg,s,00000000&cht=tx&chl=l%5E3%20%3D%202(R_M_g_%20%2B%20R_O)%5E3&chs=274x46
    • chart?chf=bg,s,00000000&cht=tx&chl=%20%3D%202(0.72A%20%2B%201.4A)%5E3&chs=294x46
    • chart?chf=bg,s,00000000&cht=tx&chl=%20%3D%204.24A%5E3&chs=136x36

    • Density:
    • chart?chf=bg,s,00000000&cht=tx&chl=p%20%3D%20%5Cfrac%7Bm%7D%7Bv%7D&chs=96x52
    • chart?chf=bg,s,00000000&cht=tx&chl=%20%3D%20%5Cfrac%7B2.676%20*%2010%5E-%5E2%5E2%7D%7B4.24A%5E3%7D&chs=196x76
    • chart?chf=bg,s,00000000&cht=tx&chl=%20%3D%203.51gcm%5E-%5E3&chs=196x38
  32. How many lead atoms are there in 1cm3 og Pb3O4? Density of Pb3O4 is 8300kg/m3. Atomic masses: Pb = 207.2, O = 16
    chart?chf=bg,s,00000000&cht=tx&chl=%5Cfrac%7B8300kg%7D%7B1m%5E3%7D%20*%20%5Cfrac%7B1000g%7D%7B1kg%7D%20*%20%5Cfrac%7B10%5E-%5E6m%5E3%7D%7B1cm%5E3%7D&chs=332x80 chart?chf=bg,s,00000000&cht=tx&chl=%5Cfrac%7B1mol%20Pb_3O_4%7D%7B685.6g%20Pb_3O_4%7D%20*%20%5Cfrac%7B3mol%20Pb%7D%7B1mol%20Pb_3O_4%7D%20*%20%5Cfrac%7B6.022*10%5E2%5E3%7D%7B1mol%7D%20%3D%202.19%20*%2010%5E2%5E2&chs=716x80
  33. In the mineral corundum (Al2O3) the coordination number of Al is 6. Use Pauling's 2nd rule to work out the coordination number of the O2- ion.
    .
  34. According to Pauling's 1st rule, in an ionic crystal structure, the coordination number of a cation by its surrounding anions is determined by...
    ...the ratio of the cation and anion radii
Author
PassYourAlevels
ID
354184
Card Set
Chemistry Revision 2020 SIMON
Description
Revision cards for Year 1 chemistry unit in EGs
Updated