Year 10 Chemistry Revision

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					        Year 10 Chemistry Revision
      Can you use numbers of electrons, protons and neutrons to identify atoms and
       ions?
      Can you draw electron shell diagrams for atoms?
      Can you draw electron shell diagrams for ionic compounds?
      Can you identify
           o Precipitation reactions
           o Decomposition reactions
           o Replacement (displacement) reactions
      Can you balance equations?
      Can you name ionic compounds?
      Can you identify oxidation and reduction reactions?
      Can you explain a galvanic cell?
      Can you define exothermic and endothermic reactions in terms of
           o H
           o Activation energy
      Can you identify groups and periods in the periodic table, and use them to predict
       the ions that will form?

Protons Neutrons Electrons Diagram                                 Charge
                                                                   Positive charges: +
  12         13           10                                       Negative charges : -
                                                                   --------------------------
                                                                   Overall charge

                                                                   This Atom Is -


                                                                   Positive charges: +
  8           8           6                                        Negative charges : -
                                                                   --------------------------
                                                                   Overall charge

                                                                   This Atom Is -


                                                                   Positive charges: +
  18         20           18                                       Negative charges : -
                                                                   --------------------------
                                                                   Overall charge

                                                                   This Atom Is -
Explain, using electron shell diagrams, showing movement of electrons :

          1.   When you react sodium with chlorine, you get NaCl
          2.   When you react sodium with oxygen, you get Na2O
          3.   When you react magnesium with chlorine, you get MgCl2
          4.   When you react magnesium with oxygen, you get MgO

State whether the following are decomposition reactions, replacement reactions or
precipitation reactions and write them as symbol equations (including states)

1.        Copper + Zinc chloride → Copper chloride + Zinc
2.        Copper nitrate + Iron sulfate → Copper sulfate + Iron nitrate
3.        Zinc carbonate → zinc oxide + carbon dioxide
4.        Lead iodide + Magnesium hydroxide → Lead hydroxide + Magnesium iodide
5.        Copper carbonate → copper oxide + carbon dioxide
6.        Nickel + Silver nitrate → silver + nickel nitrate

Balance the following chemical equations

Na + O2 → Na2O2

N2 + O2 → N2O5

H2 + O2 → H2O2

Na + O2 → Na2O

N2 + H2 → NH3

K + B2O3 → K2O + B

C6H6 + O2 → CO2 + H2O

NH4OH + H3PO4 → (NH4)3PO4 + H2O



Examine the following replacement reactions. Identify which metal is being oxidized
and which is being reduced.

     1.        Copper + Zinc chloride → Copper chloride + Zinc
     2.        Nickel + Silver nitrate → silver + nickel nitrate
     3.        Gold hydroxide + Magnesium → Gold + Magnesium hydroxide
Examine the following galvanic cell. The arrow shows the direction of flow of
electrons.

   1.     In each half cell, describe in words and an equation what is occurring and
          whether it is oxidation or reduction.
   2.     Why would the cell not work if both metals were zinc?
   3.     How would you pick two metals that would give a large current to use in your
          cell?




Fill in the following table showing names and formulae of ionic compounds that
would form.

                 NO3-             CO32-             Cl-               O2-
  +
Na
Mg2+
NH4+
Al3+



Use a periodic table to write out the formulae of all the ionic compounds that would
form from:

   1.     Group 2 metals and oxygen
   2.     Group 1 metals and fluorine
   3.     Group 3 metals and chlorine
   4.     Aluminium and group 5 non-metals
Examine the following energy diagram.

Label the following on the diagram:

   1.     Products
   2.     Reactants
   3.     Activation energy
   4.     H
   5.     Is this an endothermic or exothermic reaction?

				
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posted:11/18/2012
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