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 - Building Confidence

NameDate

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

Calcium nitrate has 2 nitrate ions per formula unit, each with 3 oxygen atoms. How many oxygen atoms are in one formula unit, Ari?
Aluminum sulfate has 3 sulfate ions per formula unit, each with 4 oxygen atoms. How many oxygen atoms are in one formula unit, Bo?
Calcium phosphate has 2 phosphate ions per formula unit, each with 4 oxygen atoms. How many oxygen atoms are in one formula unit, Esme?
4.
On the card, what does each bracket stand for, Jun?
- One calcium ion
- One oxygen atom
- One nitrate ion
5.
On the card, why are there two nitrate brackets, Kira?
Use the picture in question 4.
- Calcium has two shells
- Nitrogen atoms come in pairs
- Two 1− ions balance one 2+
6.
On the card, why is it named calcium nitrate and not calcium nitride, Luz?
Use the picture in question 4.
- The whole NO₃ unit is nitrate
- Nitride is the name for two nitrogens
- Calcium is named last
7.
What is the name of NaCl, Milo?
- Sodium chlorine
- Sodium chloride
- Chlorine sodide
8.
What is the name of MgO, Noah?
- Magnesium oxygen
- Magnesium oxide
- Magnesium dioxide
9.
What is the name of the ion CO₃²⁻, Ren?
- Carbon trioxide
- Carbide
- Carbonate
10.
What is the name of the ion NH₄⁺, Zee?
- Ammonia
- Ammonium
- Nitride

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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