Grade 10 · Science · Chemistry

10th grade Name ionic compounds, including polyatomic ions worksheet

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Name ionic compounds, including polyatomic ions

Grade 10 Science Worksheet

NameDate

Circle the best answer, or write your answer on the line.

Calcium nitrate has 1 calcium atom and 2 nitrate ions of 4 atoms each. How many atoms are in one formula unit, Ari?
Aluminum sulfate has 2 aluminum atoms and 3 sulfate ions of 5 atoms each. How many atoms are in one formula unit, Bo?
Read this first
Common polyatomic ions (IUPAC names)
name formula charge
carbonate CO₃²⁻ 2−
hydrogen carbonate HCO₃⁻ 1−
nitrate NO₃⁻ 1−
sulfate SO₄²⁻ 2−
phosphate PO₄³⁻ 3−
hydroxide OH⁻ 1−
ammonium NH₄⁺ 1+
3.
Using the table, which ion is positive, Kira?
- Phosphate
- Ammonium
- Hydroxide
4.
Using the table, how does hydrogen carbonate differ from carbonate, Luz?
- It has two more oxygens than carbonate
- It adds an H and has a 1− charge
- It is positive
5.
What is the name of NaHCO₃, Milo?
- Sodium carbide
- Sodium hydride
- Sodium hydrogen carbonate
6.
What is the name of CaCO₃, Noah?
- Calcium carbide
- Calcium carbonate
- Calcium tricarbonide
7.
What is the name of Mg(OH)₂, Pia?
- Magnesium hydroxide
- Magnesium oxide
- Magnesium dihydride
8.
Why is calcium nitrate written Ca(NO₃)₂ and not CaNO₃₂, Ren?
- The 2 is calcium's charge
- The 2 applies to the whole NO₃
- Brackets just make it look neater
9.
Why does CaCO₃ have no brackets, Tala?
- It has only one carbonate
- Carbonate is too small for brackets
- Calcium is too small
10.
How many sulfur atoms are in Al₂(SO₄)₃, Zee?
- 3
- 4
- 1

Name ionic compounds, including polyatomic ions. Every version has 10 questions, and the answer key prints on the second page.

I can name binary ionic compounds: cation, then anion with -ide (sodium chloride).
I can name compounds with common polyatomic ions: carbonate, hydrogen carbonate, nitrate, sulfate, phosphate, hydroxide, ammonium.
I can use Roman numerals for transition-metal charges (iron(III) oxide).
I can count atoms in formulas with brackets, and write formulas from names.

Standard: none (TX)

polyatomic ion: A group of atoms with one shared charge, like NO₃⁻

-ide: The ending for a one-element anion, like chloride

Roman numeral: Shows a transition metal ion's charge, as in iron(III)

brackets: Show more than one polyatomic ion in a formula

formula unit: The smallest ratio of ions in an ionic compound

Your child added the counts. Each polyatomic ion brings its own oxygens, so multiply: ions × oxygens per ion.

Your child counted the polyatomic ion once. The subscript outside the brackets multiplies every atom inside.

Your child left out the number of polyatomic ions per unit. Oxygens = units × ions per unit × oxygens per ion.

What is the most common mistake with name ionic compounds, including polyatomic ions?

Your child added the counts. Each polyatomic ion brings its own oxygens, so multiply: ions × oxygens per ion.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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