75-Archetype SyllabusChemistry • ARCH-C-14 • Spec C15

Full 6-Card Lesson 15-Question Timed Drill

UAT-UK SPEC CODE: C15 (Kinetic particle theory / States of matter)ASSUMED MATHS 1 PREREQUISITE: M4.14FREQUENCY: MEDIUM

Kinetic Particle Theory, Heating/Cooling Phase Curves, Fractional Distillation & Gas Diffusion

Deconstructed from 5 past UAT-UK questions (2.22% of all historical Chemistry papers). Students using standard A-Level classroom methods spend an average of 120s on this archetype—blowing past the 90s ESAT budget. Using the 2-line Sub-90 heuristic below compresses solve time to 30s (saving 90s per question).

Historical Frequency

5 Past Qs

2.22% of Chemistry

Classroom Trap Time

120s

+30s over 90s budget

Sub-90 Target Time

30s

Banks +90s on the clock

Dominant UI Format

Table Matching

Maths 1 Skill: M4.14

Card 1 & Card 2 Preview: The Classroom Time Trap vs. Sub-90 2-Line Rule

Excerpted from our interactive 6-Step Topic Lesson for ARCH-C-14.

Launch All 6 Active-Recall Cards

CARD 1 OF 6 • THE CLASSROOM TIME TRAP (120s)

Why Students Bleed Time:

Compare room temperature (

T = +25\,^\circ\text{C}

) against each substance's melting point (

\text{mp}

) and boiling point (

\text{bp}

): (1) **Substance

\text{X}

:**

-10\,^\circ\text{C} < 25\,^\circ\text{C} < 60\,^\circ\text{C}

(

\text{mp} < T < \text{bp}

), so

\text{X}

is a liquid. (2) **Substance

\text{Y}

:**

25\,^\circ\text{C} > -85\,^\circ\text{C}

(

T > \text{bp}

), so

\text{Y}

is a gas. (3) **Substance

\text{Z}

:**

25\,^\circ\text{C} < +45\,^\circ\text{C}

(

T < \text{mp}

), so

\text{Z}

is a solid (~85s).

In 5 past UAT-UK questions (2.22% of Chemistry), candidates lose 90s by reversing inequality ordering for negative celsius temperatures on a number line. Instead, apply C15 with Maths 1 skill M4.14.

CARD 2 OF 6 • THE 2-LINE SUB-90 HEURISTIC (<30s)

**Line 1 (Number Line Check at

+25\,^\circ\text{C}

):** Between

\text{mp}

and

\text{bp} \implies

liquid (

\text{X}

); above

\text{bp} (-85\,^\circ\text{C}) \implies

gas (

\text{Y}

); below

\text{mp} (+45\,^\circ\text{C}) \implies

solid (

\text{Z}

Line 2 (Match Row): Liquid, Gas, Solid (15s).

Sanity & Limit Check: Verify units/signs against fence_post_or_domain_trap (Misidentifying the physical state at target temperature T on a negative Celsius scale (e.g. thinking -80 °C is hotter than -50 °C when comparing against MP = -95 °C, BP = -60 °C)) and multi_statement_linchpin_foil (Claiming average kinetic energy of particles increases during the flat horizontal melting or boiling plateau on a heating curve).

Examiner Distractor Blueprint for ARCH-C-14

FOIL #1fence_post_or_domain_trap

Misidentifying the physical state at target temperature T on a negative Celsius scale (e.g. thinking -80 °C is hotter than -50 °C when comparing against MP = -95 °C, BP = -60 °C)

Reversing inequality ordering for negative Celsius temperatures on a number line.

Open Fence-Post / Domain Trap Clinic

FOIL #2multi_statement_linchpin_foil

Claiming average kinetic energy of particles increases during the flat horizontal melting or boiling plateau on a heating curve

During a phase change plateau, temperature is constant so average kinetic energy is constant; heat energy increases potential energy by overcoming intermolecular forces.

Open Multi-Statement Linchpin Foil Clinic

FOIL #3sign_or_direction_flip

Saying heavier gas molecules (larger M_r) diffuse faster or form the white NH4Cl ring closer to the NH3 end than the HCl end of a diffusion tube

Lighter molecules (NH3, M_r = 17) diffuse faster than heavier molecules (HCl, M_r = 36.5), so the white NH4Cl ring forms closer to the HCl end.

Open Sign / Direction Flip Clinic

FOIL #4table_column_pruning_trap

Evaluating all 4 substances in a melting/boiling point table before drawing a vertical number line at T_target (Solid if T < MP; Liquid if MP < T < BP; Gas if T > BP)

Not checking the T_target inequality condition on the easiest row first.

Open Table Column Pruning Trap Clinic

Try 1 Live Sample Question Under the 90-Second Stopwatch

Press W to open the 2-line dry-wipe scratchpad, select A–E, and lock in to reveal the Dual-View solution.

Full 6-Card Lesson Launch All 15 Questions (ARCH-C-14)

ARCH-C-14: Kinetic Particle Theory, Heating/Cooling Phase Curves, Fractional Distillation & Gas Diffusion (Sample)Chemistry

00:00.0

SUB-90 ZONE (<30S)

0.0s30s Sub-9090s ESAT Budget150s Classroom

Question 1 of 1ARCH-C-14 (6-Card Lesson)Format: Standard 5-Option

Right-click any option to cross out • Keys A–E + Enter

Question 1 of 1 • 90s Target

Ready to Start Question 1?

The question stem, diagram, and answer options are hidden behind this pre-start gate. When you click below, the question will reveal and your 90-second split stopwatch will immediately begin ticking.

Chemistry•ARCH-C-14•Standard 5-Option

or press Enter to start