Oxidation State Worksheet
A Grade 10 Chemistry worksheet focusing on understanding and calculating oxidation states of elements in compounds and polyatomic ions.
Includes
Standards
Topics
Oxidation State Practice
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Read each question carefully and provide the best answer. Show your work where calculation is required. Remember the rules for assigning oxidation states.
1. What is the oxidation state of oxygen in most compounds?
+1
-1
+2
-2
2. What is the oxidation state of a free element?
+1
-1
0
Varies
3. The sum of the oxidation states of all atoms in a neutral compound is always .
4. In peroxides, oxygen has an oxidation state of .
5. Calculate the oxidation state of sulfur in H₂SO₄. Show your work.
6. Determine the oxidation state of chromium in the dichromate ion, Cr₂O₇²⁻. Show your work.
7. Oxidation is the loss of electrons, and the oxidation state of an element decreases during oxidation.
True
False
8. In ionic compounds, the oxidation state of an ion is equal to its charge.
True
False