Chemistry · 10th Grade

Active learning ideas

Nomenclature of Ionic Compounds

Active learning builds muscle memory for the IUPAC rules by putting naming and formula-writing into students’ hands. Repeated, low-stakes practice with immediate feedback corrects the two most common mix-ups: applying covalent prefixes to ionic compounds and forgetting Roman numerals for variable-charge metals.

• Common Core State Standards
• STD.HS-PS1-2
• STD.CCSS.ELA-LITERACY.RST.9-10.4

• 20–35 min
• Pairs → Whole Class
• 3 activities

Activity 01

• Think-Pair-Share
• 30 min · Pairs

Think-Pair-Share: Sorting the Strategy

Students receive 12 ionic compound formulas and must first sort them into three groups: fixed-charge metals, variable-charge metals, and compounds with polyatomic ions. Then, with a partner, they write the correct IUPAC name for each compound in their group and compare with another pair. The teacher focuses the debrief on the decision tree students used to choose the correct naming strategy.

Explain why a standardized naming system is essential for scientific communication.

Facilitation Tip

During Think-Pair-Share: Sorting the Strategy, circulate and listen for students who mistakenly say ‘di’ or ‘tri’—pause the pair and ask them to justify the prefix before moving on.

What to look for

Provide students with a list of 5-7 chemical formulas for ionic compounds (including binary, transition metal, and polyatomic ion examples). Ask them to write the correct IUPAC name for each on a mini-whiteboard and hold it up for immediate feedback.

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Activity 02

• Academic Speed Dating
• 20 min · Small Groups

Whiteboard Race: Name It, Write It

Each group receives a small whiteboard and marker. The teacher calls out either a formula or a name, and groups race to write the answer correctly. Incorrect answers require groups to identify and correct their error before the next round. This fast-paced activity builds procedural fluency and reveals common errors in a low-stakes context.

Construct the name of an ionic compound given its formula.

Facilitation Tip

For Whiteboard Race: Name It, Write It, require students to write the metal charge as a superscript first, forcing the Roman-numeral habit in every example.

What to look for

On an index card, have students write the chemical formula for 'copper(II) sulfate' and 'magnesium nitrate'. Then, ask them to write the IUPAC name for the formula MgCl2.

• Remember
• Understand
• Apply
• Relationship Skills
• Self-Management

Activity 03

• Academic Speed Dating
• 35 min · Small Groups

Card Sort: Formula to Name Matching

Groups receive a deck of 20 cards: 10 formulas and 10 names. They match each formula to its correct name, then sort the matched pairs into categories (binary ionic, ionic with transition metals, ionic with polyatomic ions). After checking against an answer key, groups write one sentence explaining the rule that distinguished each category.

Differentiate between naming binary ionic compounds and those with polyatomic ions.

Facilitation Tip

In Card Sort: Formula to Name Matching, place one obviously wrong name card (e.g., magnesium(II) chloride) in each set to catch students who over-apply numerals.

What to look for

Divide students into pairs. Give each pair a set of cards with chemical formulas and another set with corresponding IUPAC names. Students take turns matching a formula card to its correct name card, explaining their reasoning to their partner.

• Remember
• Understand
• Apply
• Relationship Skills
• Self-Management

A few notes on teaching this unit

Start with the decision tree: metal vs. nonmetal, main-group vs. transition, fixed vs. variable charge. Use color-coding on the periodic table to highlight regions where Roman numerals are needed. Avoid teaching prefixes altogether for ionic compounds; instead, contrast side-by-side with covalent examples to make the systems memorable. Research shows that frequent, short naming drills spaced across days beats marathon sessions once a week.

By the end of these activities, students should confidently decide when to add a Roman numeral, recognize polyatomic ions by name, and translate between formula and IUPAC name without hesitation. Clear naming decisions and error-free whiteboard responses signal mastery.

---

Watch Out for These Misconceptions

• During Think-Pair-Share: Sorting the Strategy, watch for students who sort formulas with Roman numerals under the covalent category because of the numerals’ ‘prefix-like’ appearance.

  Pause the pair and ask them to explain what the Roman numeral represents (charge) versus a prefix (number of atoms). Have them re-sort while stating aloud, ‘Ionic charges determine ratio, not prefixes.’

• During Whiteboard Race: Name It, Write It, watch for students who omit the Roman numeral for transition metals like FeCl3, writing it as iron chloride instead.

  Circulate with a mini-whiteboard that shows FeCl3 and iron(III) chloride side by side. Ask the student to compare the two and add the numeral before moving to the next example.

---

Methods used in this brief

• Think-Pair-Share
• Academic Speed Dating