Grade 12 Polyatomic Ions Worksheet
This worksheet covers the naming, formulas, and properties of common polyatomic ions for Grade 12 Chemistry students.
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Grade 12 Polyatomic Ions Worksheet
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Read each question carefully and provide the best answer. Show all work for calculations where applicable.
1. Which of the following polyatomic ions has a -2 charge?
Nitrate (NO₃⁻)
Sulfate (SO₄²⁻)
Ammonium (NH₄⁺)
Hydroxide (OH⁻)
2. What is the correct formula for the phosphate ion?
PO₃³⁻
PO₄³⁻
HPO₄²⁻
P₂O₇⁴⁻
3. A polyatomic ion is a group of atoms covalently bonded together that possesses an overall charge.
4. The prefix 'per-' in a polyatomic ion name, such as perchlorate, indicates oxygen atoms than the '-ate' form.
Match the polyatomic ion with its correct name.
5. HCO₃⁻
a. Dichromate
6. Cr₂O₇²⁻
b. Bicarbonate
7. CN⁻
c. Cyanide
8. MnO₄⁻
d. Permanganate
9. Explain the naming convention for oxyanions (polyatomic ions containing oxygen) when there are more than two forms (e.g., sulfite vs. sulfate).
10. All polyatomic ions have a negative charge.
True
False
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