1. Oxidation is the loss of electrons. True False 2. Fe (s) --> Fe 2+ + 2e - is

Question

1. Oxidation is the loss of electrons.

True

False

2. Fe (s) --> Fe2+ + 2e- is an example of reduction.

True

False

3. What is the oxidation number of the chlorine atoms in Cl2?

4. What is the oxidation number of chlorine in ClO3-?

5. What is the oxidation number of sulfur in (NH4)2SO4? When dealing with ionic compounds, it is helpful to first divide the compound into the separate polyatomic ions.

6. A few weeks ago in lab, we reacted iodate with iodide and acid to produce I2 via the following reaction.

IO3- + 6H+ + 5I- --> 3I2 + 3H2O. In this reaction, the iodine atoms in the iodate ion are being oxidized.

True

False

7. In a voltaic cell, reduction occurs at the cathode.

True

False

Explanation / Answer

1) True

2) False, since loss of electrons therefore oxidation

3) zero (oxidation state of pure element is always zero)

4) x -2 = -3 therefore x = -1

5) (1 x2) +x + (4 X -2) = 0 , therefore x = +8 -2 = 6

6) In IO3- oxidation state of I = x - 6 = -1, therefore x = 5, and oxidation state of I2 = 0, therefore iodine went reduction (gain of electrons)

7. True

6

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