Assign1 Chem 027 2012 by xiaopangnv

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									Enabling Chemistry 027 Assignment 1 2012
                                                                          Class Code:




Name: _________________________________________________________________________

Date Due:    Thurs. 8th March (classes EC027A31 & EC027A41)
             Fri. 9th March (classes EC027A51, EC027A52, EC027A61 & EC027A71)

The answers of this assignment must be written in the spaces provided and given directly to your
lecturer in the classroom at the beginning of the lesson on (or before) the due date.


1     a      Describe a physical property which makes each of the following useful:

             Iron:_________________________________________________________
             Copper:_______________________________________________________
             Lead:_________________________________________________________
             Alcohol:_______________________________________________________
             Helium:________________________________________________________

      b      Describe a chemical property which makes each of the following useful:

             Petrol:_________________________________________________________
             Oxygen:________________________________________________________
             Carbon dioxide:__________________________________________________

2.     Identify each of the following as examples of physical (P) or chemical (C) change.

      a      Evaporation of petrol. ____                     d      Dissolving salt in water. ____
      b      Tarnishing of silver. ____                      e      Digestion of food. ____
      c      Ripening of fruit. ____                         f      Formation of snowflakes. ____

3.    List four common but useful materials and classify these as elements, compounds, solutions or
      heterogenous mixtures. Identify which of these materials are used in a naturally occurring form
      and which have been processed in some way.

      Material                         Classification                  Natural form or processed




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Enabling Chemistry 027 Assignment 1 2012
4.    A white crystalline solid seems unable to be separated into simpler components using physical
      methods. However, if the white solid is melted and an electric current is passed through it, a
      grey solid and brown liquid are produced. Identify, with reasons, whether the white solid is an
      element, compound or mixture.
      _________________________________________________________________________
      _________________________________________________________________________
      _________________________________________________________________________
      _________________________________________________________________________

5     Define the following:
      a       Atom:____________________________________________________________
              ___________________________________________________________________
              Molecule:_________________________________________________________
              ___________________________________________________________________
              Simple ion:________________________________________________________
              ___________________________________________________________________
              Polyatomic ion:_____________________________________________________
              ___________________________________________________________________
      b       Element:____________________________________________________________
              ___________________________________________________________________
              Compound:___________________________________________________________
              ___________________________________________________________________

6.    Aspirin and sucrose are two important compounds. Aspirin contains 9 carbon atoms, 8
      hydrogen atoms and 4 oxygen atoms per molecule. In sucrose there are 12 carbon atoms, 22
      hydrogen atoms and 11 oxygen atoms per molecule. Write molecular formulas for aspirin and
      sucrose.
      Aspirin:___________________                 Sucrose:________________________

7.    Classify each of the following as either an element (E) or a compound (C).

      N2 _______                                            C _____
      He _____                                              NH4NO2 _______
      C2H5OH _____                                          Cl2. _______
      KI _____

8.    How many atoms of hydrogen are present in each of the following formulas?

      a       H2O2 ________                                 c        C2H5CO2H _____
      b       (NH4)2SO4 ________                            d        (NH4)2HPO4 _________
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Enabling Chemistry 027 Assignment 1 2012
9.    Classify the following molecular substances as consisting of monatomic, diatomic or
      polyatomic molecules.

      CO ____________                                                HCl ______________
      Cl2 _____________                                              HNO3 _____________
      NH3 _____________                                              Ne ______________
      CH4 ______________                                             F2 _______________

10.   Write formulas for the following.

      a      fluorine __________                                     e       phosphorous trichloride ______
      b      dinitrogen monoxide _________                           f       phosphorous __________
      c      methane __________                                      g       carbon tetrachloride _________
      d      ammonia __________                                      h       chlorine trifluoride __________

11.   Write names for the following formulas.

      a      F2 ____________________________________                 e       HCl ______________________
      b      SO2 __________________________________                  f       P2O5 ________________________________
      c      HI _______________________                              g       NF3 _________________________________
      d      I2 _____________________________________                h       CF4 _________________________________

12    Write names for the following ionic compounds.

      a      MgCl2 ___________________________________________________________________________________________
      b      KHSO4 ___________________________________________________________________________________________
      c      Fe2O3.3H2O _________________________________________________________
      d      (NH4)2SO3 _______________________________________________________________________________________
      e      Ca(HCO3)2 _______________________________________________________________________________________
      f      PbO2 _______________________________________________________________

13    Write formulas for the following ionic compounds.

      a      Mercury(I) chloride. _______________
      b      Mercury(II) nitrate-1-water. ________________
      c      Aluminium phosphate. _______________
      d      Ammonium carbonate. _______________
      e      Potassium permanganate. _______________
      f      Copper(II) carbonate. _______________


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Enabling Chemistry 027 Assignment 1 2012
14    a      What is the difference in meaning between the terms symbol and formula?

      _________________________________________________________________________
      _________________________________________________________________________

      b      What is the difference between

             (i)     Co and CO?

             _______________________________________________________________________

             (ii)    Pb and PB?

             _______________________________________________________________________

15    Complete Table 3 below by filling in the spaces.

      Table 3
                                               17
                Symbol       14                    2-                                    2+
                                  N              8O          20Ca                    12Mg
      Protons                                                            17
      Neutrons                                                20         20             13
      Electrons                                                          18
      Net charge               0                              2+
      Atomic number
      Mass Number

16.   From the information in Table 2 below:

      Table 2.
           Species                 Protons              Neutrons        Electrons
               A                     20                    20              18
               B                     17                    20              18
               C                     20                    22              20
               D                     20                    26              18
               E                     19                    20              18
               F                     18                    22              18

      a      Identify those species which are:

             (i) isotopes__________                 (ii) neutral atoms __________
             (iii) positive ions __________         (iv) negative ions __________

      b      Use a periodic table to identify each of the elements and write the actual symbol
             (including its charge if appropriate) for each of the species.

             A _______                              C _______                          E _______
             B _______                              D _______                          F _______
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Enabling Chemistry 027 Assignment 1 2012
17.       In the periodic table in Figure 4 identify which letters represent:

          a      a noble gas __________
          b       an alkali or group 1 metal __________
          c      a halogen or group 7 element __________
          d      a transition metal __________
          e      a metal which is not an alkali metal nor a transition metal __________
          f      three elements which would likely show similarities in chemical properties __________
          g      an element with 1 electron in its valence shell __________
          h      an element with 2 electrons in its valence shell __________
          i      an element with needs1 electron to fill its valence shell __________
          j      an element with a filled valence shell __________
          k      an element in group 2 __________

Figure 4




A                                                                                               H

      B                                                                                   G

      C                                          E                                              I



      D                                                                  F

J




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