Key Learning Objectives
- Name ionic compounds from metal and non-metal ion combinations (-ide vs -ate suffixes).
- Use Roman numerals to represent transition metal oxidation states (e.g. Iron(II) vs Iron(III)).
- Name common laboratory acids and their corresponding salt families (sulfates, chlorides, nitrates).
Topic Summary & Core Notes
Master chemical nomenclature rules. Name ionic salts, transition metal oxidation states, binary compounds, and mineral acids with zero ambiguity.
Key Rules, Formulas & Definitions
Suffix Rules
-ide = 2 elements only; -ate = includes oxygen (e.g. sulfate, nitrate, carbonate)
Acid-Salt Families
Hydrochloric acid → Chlorides; Sulfuric acid → Sulfates; Nitric acid → Nitrates
2 Step-by-Step Worked Examples
Worked Example 1
Worked Example 1: Naming Polyatomic Salts
Question: Name the compounds: a) CuCl2, b) CuSO4.
Step-by-Step Solution:
- Step 1: a) CuCl2: Copper + Chlorine (-ide suffix). Cl is -1, so 2 Cl = -2; Copper must be +2 → Copper(II) chloride.
- Step 2: b) CuSO4: Copper + Sulfate group (-ate suffix). Sulfate is SO4^2-, so Copper is +2 → Copper(II) sulfate.
Final Answer: a) Copper(II) chloride. b) Copper(II) sulfate.
Senior Examiner Insight: Always include Roman numerals for transition metal ions.
Worked Example 2
Worked Example 2: -ide vs -ate
Question: Explain the difference between sodium sulfide and sodium sulfate.
Step-by-Step Solution:
- Step 1: Sodium sulfide: Contains only sodium and sulfur (Na2S).
- Step 2: Sodium sulfate: Contains sodium, sulfur, and oxygen (Na2SO4).
Final Answer: Sodium sulfide contains only sodium and sulfur (Na2S); sodium sulfate contains sodium, sulfur, and oxygen (Na2SO4).
Senior Examiner Insight: The -ate suffix denotes the presence of oxygen atoms.
Common Pitfalls & Examiner Warnings
Common Mistake: Omitting Roman numerals for transition metals
Transition metals form multiple ions; write Iron(II) or Iron(III), not just 'iron'.
Interactive Self-Check Quiz (3 Questions)
Question 1 of 3
What salt family is produced when sulfuric acid reacts with a metal base?
Click to Reveal Answer & Mark Scheme
Correct Answer: B) Sulfates
Detailed Explanation: Sulfuric acid produces sulfate salts.
Mark Scheme & Scoring Points: 1 mark for Sulfates.
Question 2 of 3
What does the Roman numeral in 'Iron(III) oxide' represent?
Click to Reveal Answer & Mark Scheme
Correct Answer: B) The +3 charge / oxidation state on the iron ion
Detailed Explanation: Roman numerals indicate the positive charge/oxidation state of the transition metal ion.
Mark Scheme & Scoring Points: 1 mark for +3 charge / oxidation state.
Question 3 of 3
Which formula represents calcium nitrate?
Click to Reveal Answer & Mark Scheme
Correct Answer: B) Ca(NO3)2
Detailed Explanation: Ca forms Ca^2+ and NO3 forms NO3^-, so 2 nitrate ions balance 1 calcium ion: Ca(NO3)2.
Mark Scheme & Scoring Points: 1 mark for Ca(NO3)2.
Created by Fiaraz Iqbal
Former Headteacher & Senior Science / Maths Examiner
Fiaraz produces structured video walkthroughs, Tier 3 literacy packs, and exam mark scheme breakdowns to help secondary students achieve top grades.
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