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Saturday, February 28, 2009 @ 11:41 PM
Chem quiz answers

(Gain or Loss of electrons)

  1. Oxidation is loss of electrons.
  2. (a) reduced

Ag+ has gained 1 electron to from Ag

(b) oxidised

Cl- has lost 1 electron to form Cl2

  1. Mg has lost 2 electrons to form Mg²+ in MgO.



(Changes in oxidation state)

1. Decrease in oxidation state number.

2. (a) -2

(b) +4

(c) +6

(d) 0

(e) +6

(f) +2

3. reduced

H in HCL has decreased in oxidation state number from +1 to 0 in H2. Therefore HCl is reduced.



(Gain or Loss of Oxygen/Hydrogen)

1. (a) gain in oxygen

(b) loss of hydrogen

2. (a) Na has gain oxygen atom to form Na2O

(b) Nh3 has lost hydrogen atoms to form N2

3. CO has been oxidized to CO2 when it gain oxygen atom.


Good luck for Common Test.


-Shevons



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