Polyatomic Ions Worksheet
Grade 9 Science worksheet on understanding and identifying polyatomic ions, their charges, and common examples.
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Polyatomic Ions Practice
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Read each question carefully and provide the best answer. This worksheet will test your knowledge of polyatomic ions.
1. A polyatomic ion is a group of two or more atoms covalently bonded together that acts as a single unit with an overall electric .
2. The ammonium ion has the chemical formula and a charge of .
3. The sulfate ion (SO₄²⁻) has a charge of .
1. Which of the following is NOT a polyatomic ion?
Hydroxide (OH⁻)
Chloride (Cl⁻)
Carbonate (CO₃²⁻)
Phosphate (PO₄³⁻)
2. What is the correct formula for the nitrate ion?
NO₂⁻
NO₃²⁻
NO₃⁻
N⁻
1. All polyatomic ions have a negative charge.
True
False
2. The prefix 'per-' in a polyatomic ion name generally indicates more oxygen atoms than the '-ate' form.
True
False
Match each polyatomic ion on the left with its correct chemical formula on the right.
1. Carbonate
a. SO₄²⁻
2. Sulfate
b. OH⁻
3. Hydroxide
c. CO₃²⁻
4. Phosphate
d. NH₄⁺
5. Ammonium
e. PO₄³⁻
1. Explain why polyatomic ions are important in forming ionic compounds.
2. Name two common polyatomic ions that contain sulfur, and provide their chemical formulas.