Oxidation States Worksheet
A Grade 11 Chemistry worksheet focusing on understanding and calculating oxidation states of elements in compounds and polyatomic ions.
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Standards
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Oxidation States Worksheet
Name:
Date:
Score:
Read each question carefully and provide the best answer. Show all your work for calculation questions.
1. What is the oxidation state of oxygen in peroxides (e.g., H₂O₂)?
-2
-1
0
+1
2. In which of the following compounds does nitrogen have an oxidation state of +5?
NO
N₂O
HNO₃
NH₃
1. The oxidation state of an element in its elemental form is always .
2. In a neutral compound, the sum of all oxidation states must equal .
3. The most common oxidation state for Group 1 metals is .
1. Determine the oxidation state of chromium (Cr) in the dichromate ion, Cr₂O₇²⁻. Show your work.
2. Explain why fluorine always has an oxidation state of -1 in its compounds.
1. In an ionic compound, the oxidation state of an ion is equal to its charge.
True
False
2. Oxidation always involves the gain of electrons.
True
False
Match the compound/ion with the oxidation state of the underlined element.
1. H₂S
a. +6
2. SO₄²⁻
b. -2
3. Fe₂O₃
c. +3
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