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Consolidation · L4–L6

Consolidation: Chemical Analysis 🎯

Exam Skills Across Gas, Flame & Anion Tests

🧪🔥🧫✍️🏅
Learning Objectives:
  • Recall (2.43–2.49) – the gas, flame and anion tests from Lessons 4–6.
  • Exam skill – structure full-mark answers using Reagent · Method · Observation and identify unknown compounds.

🏆 By the end I will be able to…

All: state the reagent and result for a named test, and pick out exam mistakes.

Most: write a full answer using Reagent–Method–Observation, and identify a compound from two clues.

Some: answer a 6-mark identification question with justified reasoning and ionic equations.

Navigation: Arrow Keys or Spacebar

Teacher Print Tools – Consolidation

⏱️ Recap Map · 60 sec

The Whole Series on One Screen

One framework for every answer: R-M-O — the Reagent you add, the Method, and the Observation (with the colour/result). Miss any one and you lose the mark.

🧪 Gas tests (L4)

H₂Burning splint → pop
O₂Glowing splint → relights
CO₂Limewater → milky
NH₃Damp red litmus → blue
Cl₂Damp litmus → bleached

🔥 Flame tests (L5)

Li⁺Crimson red
Na⁺Yellow
K⁺Lilac
Ca²⁺Orange-red
Cu²⁺Blue-green

🧫 Anion & water (L6)

Cl⁻AgNO₃ → white
Br⁻AgNO₃ → cream
I⁻AgNO₃ → yellow
SO₄²⁻BaCl₂ → white
CO₃²⁻HCl → fizz, milky
H₂OCuSO₄ white→blue
Whiteboards — 20 seconds: say R-M-O, then name one gas test, one flame colour and one anion test. That’s today in a nutshell.
⭐ Fab 4

The Fab 4 – Recall Across the Series

Instructions: Multiple choice across Lessons 4–6 — write the letter in your book. No calling out. Reveal when ready.

1. Gas test (L4)

How do you test for hydrogen?

A) Glowing splintB) Burning splint → popC) Limewater

✅ B) Burning splint → squeaky pop.

2. Flame (L5)

Which ion gives a yellow flame?

A) Li⁺B) Cu²⁺C) Na⁺D) K⁺

✅ C) Na⁺ (sodium).

3. Anion (L6)

Cl⁻ with acidified silver nitrate gives a ____ precipitate.

A) yellowB) creamC) white

✅ C) White.

4. Exam skill

Every analysis answer needs three things:

A) name, date, classB) Reagent, Method, ObservationC) acid, base, salt

✅ B) Reagent, Method, Observation (R-M-O).

Starter

🔍 Starter: Marker\u2019s Eye

Be the examiner. Each answer below looks reasonable but loses a mark. Read it, decide what\u2019s missing, then tap to mark it and see the one word that would earn the mark. No calling out!
“Hold a splint near the gas and it pops, so it\u2019s hydrogen.”
tap to mark ▸
“Damp litmus turns blue, so the gas is chlorine.”
tap to mark ▸
“The flame looks reddish, so the ion is lithium.”
tap to mark ▸
“Acidify the halide test with HCl, then add silver nitrate.”
tap to mark ▸
“A precipitate forms, so the ion is a halide.”
tap to mark ▸
✅
What earns marks: be specific. Name the test, the exact colour, the correct acid, the full observation.

Answers marked: 0 / 5  

🧠 Golden rule: R-M-O — Reagent, Method, Observation. Every answer, every time.
I Do

I Do: How to Answer a 6-Mark Identification Question

Watch the thinking: I test the cation and the anion separately, give evidence for each, then combine. Every claim needs a “because”.

6 marks · Describe & Explain

Q: An unknown white compound dissolves in water. Tests: flame = yellow; acidified silver nitrate = white precipitate.

(a) Identify the cation and explain [2]   (b) Identify the anion and explain [2]   (c) Name the compound and write the ionic equation [2]

🎯 Pattern: Flame → cation. Reagent test → anion. Combine → compound. Each identification needs evidence (“because the flame was yellow”), never just the answer.

Talk to your partner: in part (a), what is the evidence that wins the second mark? Be ready to build an answer yourselves next.
🧭 Observe

Observe: The Identification Decision Tree

The systematic method examiners reward. Predict each branch out loud, then tap to reveal it. This is exactly the order to follow for any \u201cidentify the unknown\u201d question.
Ready check: cover the screen — can you say the method in order? Dissolve → flame (cation) → HCl (fizz?) → silver nitrate → barium chloride → combine.
We Do

We Do: Build a 4-Mark Answer Together

One mark per point. For each part, tap the option that scores the mark. Watch your total build to 4/4. A wrong tap just wobbles — try again.
Marks earned: 0/4

4 marks · Describe   A gas is collected from zinc + hydrochloric acid. (a) Name the gas (b) Describe the test (c) State the positive result (d) Explain why a BURNING (not glowing) splint is used.

(a) [1] Name the gas:
(b) [1] Describe the test:
(c) [1] Positive result:
(d) [1] Why burning, not glowing?
🧡 R-M-O check: you named the gas, the method (burning splint), the observation (squeaky pop), then the reasoning. That is a full-mark answer.
Independent Work

Independent Exam Practice

Instructions: Work silently on your exam-practice sheet. Full sentences, one point per mark, correct scientific terms. Use R-M-O to structure each answer.
Independent Work Timer
08:00

Foundation (Grades U–1)

Recall MCQs plus short tests across the series, building to a 3-mark identification question.

Middle (Grades 2–3)

Compare similar tests, explain the nitric-acid rule, then a 4-mark identification question.

Higher (Grades 3–5)

Write ionic equations, design a systematic method, then a 6-mark unknown-compound question.

📋 Scaffolding

Every pack includes the colour table, the method, sentence starters and word banks. Use them whenever you need them — that’s what they’re for.

🏆 Success Criteria

Foundation (U–1): I can state the reagent and result for a named test and structure a short answer.

Middle (2–3): I can write a full R-M-O answer and identify a compound from two clues.

Higher (3–5): I can answer a 6-mark identification question with justified reasoning and ionic equations.

Exit Ticket

Exit Ticket – Exam Skills Check

Exam skills check: six questions on technique and identification across the whole series. Tap your answer for instant feedback and a score. Books closed, no notes!
Score: 0/6
🖨️ Print written exit ticket:
Slide 1/9

🎉 Lesson Complete!

Chemical Analysis — Consolidation

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