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UAT-UK SPEC: C14MODULE: CHEMISTRYTOPIC ID: ARCH-C-15

Periodic Table Trends (Groups 1, 17, 18), Metal Reactivity Displacement & Extraction Series

Master Periodic Table Trends (Groups 1, 17, 18), Metal Reactivity Displacement & Extraction Series on the ESAT Chemistry paper. Traditional classroom derivations waste valuable seconds. Using the 2-step Sub-90 invariant elimination method compresses solve time to 30s, saving +95s per question.

Standard Classroom Time
125s
Textbook multi-line derivations bleed exam clock
Sub-90 Target Pace
30s
Comfortably below the 88.8s per-question limit
Time Saved for Review
+95s
Banks clock buffer across 27 questions

2-Step Sub-90 Shortcut Formula

How to eliminate intermediate algebra and solve under 45 seconds.

Launch Interactive Lesson
STEP 1 • SETUP INVARIANT (LINE 1)10–15s
Line 1 (Reactivity Opposite): Group 1 loses e−e^- (reactivity ↑\uparrow); Group 17 gains e−e^- (reactivity ↓\downarrow)   ⟹  \implies 1 & 2 True.

Establish the structural invariant and eliminate impossible options immediately.

STEP 2 • FAST SOLVE (LINE 2)15–25s
Line 2 (mp/bp\text{mp/bp} Opposite): Group 1 mp/bp\text{mp/bp} ↓\downarrow (3 True); Group 17 mp/bp\text{mp/bp} ↑\uparrow (Cl2(g)→Br2(l)→I2(s)\text{Cl}_2\text{(g)} \rightarrow \text{Br}_2\text{(l)} \rightarrow \text{I}_2\text{(s)}, 4 False) (20s).

Evaluate the simplified expression using integer factoring or unit elimination.

Distractor Trap Forensics

The predictable cognitive traps engineered by examiners into the wrong options.

TRAP #1sign_or_direction_flip

Assuming Group 17 halogens become more reactive down the group like Group 1 alkali metals (or that Group 1 melting points increase down the group like Group 17)

Down Group 1: reactivity INCREASES (easier to lose outer e⁻) and MP DECREASES. Down Group 17: reactivity DECREASES (harder to gain outer e⁻) and MP/BP INCREASES (stronger intermolecular forces).

Sub-90 Fix: Test invariants before expanding equations.
TRAP #2multi_statement_linchpin_foil

Claiming aluminium or magnesium is extracted by heating its oxide with carbon in a blast furnace (metals above carbon require electrolysis of molten ore)

Carbon can only reduce oxides of metals BELOW carbon in the reactivity series (Zn, Fe, Sn, Cu); K, Na, Ca, Mg, Al require molten electrolysis.

Sub-90 Fix: Test invariants before expanding equations.
TRAP #3multi_statement_linchpin_foil

Claiming zinc sacrificial protection stops iron rusting purely by acting as a physical barrier (ignoring that zinc is more reactive and oxidises preferentially even when scratched)

Because Zn is higher in the reactivity series than Fe, Zn loses electrons in preference to Fe (sacrificial anode protection) even if the coating is scratched.

Sub-90 Fix: Test invariants before expanding equations.

Try 1 Timed Question: Periodic Table Trends (Groups 1, 17, 18), Metal Reactivity Displacement & Extraction Series

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Full Lesson All 15 Questions (ARCH-C-15)
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ARCH-C-15: Periodic Table Trends (Groups 1, 17, 18), Metal Reactivity Displacement & Extraction Series (Sample)Chemistry
00:00.0
SUB-90 ZONE (<50S)
0.0s50s Sub-9090s ESAT Budget150s Classroom
Question 1 of 1ARCH-C-15 (6-Card Lesson)Format: 1-2-3 Multi-Statement Combination
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Question 1 of 1 • 90s Target

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