Oxidation Numbers Worksheet
This worksheet focuses on understanding and calculating oxidation numbers for various elements in compounds and polyatomic ions, a fundamental concept in Grade 10 Chemistry.
Includes
Standards
Oxidation Numbers Practice
Name:
Date:
Score:
Read each question carefully and follow the instructions to determine oxidation numbers. Show your work where necessary.
1. The oxidation number of an uncombined element is always .
2. In a neutral compound, the sum of all oxidation numbers must equal .
3. In polyatomic ions, the sum of all oxidation numbers must equal the of the ion.
4. Hydrogen usually has an oxidation number of +1, but it is in metal hydrides.
1. What is the oxidation number of sulfur in H₂SO₄?
+2
+4
+6
-2
2. Which of the following elements has an oxidation number of -1 in most of its compounds?
Oxygen
Fluorine
Sodium
Chlorine
1. Determine the oxidation number of chromium (Cr) in the dichromate ion, Cr₂O₇²⁻. Show your work.
2. Calculate the oxidation number of nitrogen (N) in the nitrate ion, NO₃⁻. Show your work.
1. The oxidation number of oxygen is always -2 in all compounds.
True
False
2. In a binary ionic compound, the oxidation number of an element is equal to its charge as an ion.
True
False
1. Explain why understanding oxidation numbers is important in chemistry, particularly in the context of redox reactions.
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