Grade 12 Oxidation State Worksheet
A comprehensive worksheet for Grade 12 Chemistry students focusing on understanding and assigning oxidation states to elements in compounds and ions.
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Grade 12 Oxidation State Worksheet
Name:
Date:
Score:
Read each question carefully and provide your answers in the spaces provided. Show all your work for calculations.
1. The oxidation state of an atom in a free element is always .
2. In most compounds, the oxidation state of oxygen is , except in peroxides where it is .
3. The sum of the oxidation states of all atoms in a neutral compound is .
4. For a polyatomic ion, the sum of the oxidation states of all atoms equals the of the ion.
1. What is the oxidation state of sulfur in H₂SO₄?
+2
+4
+6
-2
2. In which of the following compounds does nitrogen have an oxidation state of +5?
NH₃
NO₂
N₂O₄
HNO₃
1. Determine the oxidation state of chromium in the dichromate ion, Cr₂O₇²⁻. Show your work.
2. Explain why the oxidation state of hydrogen can be +1 or -1, providing an example for each case.
1. In an ionic compound, the oxidation state of an ion is equal to its charge.
True
False
Match the compound/ion with the oxidation state of the underlined element.
1. K₂Cr₂O₇ (Cr)
a. +3
2. SO₃²⁻ (S)
b. +6
3. Fe₂O₃ (Fe)
c. +4
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