Drawing curly arrows that do not originate exactly from a lone pair of electrons or a bond, but rather start from empty space or from an atom label.

Ensure the tail of the curly arrow begins precisely on the double bond or the lone pair of the nucleophile/electrophile and points directly to the atom receiving the electrons.

Failing to convert the volume of gas from cm3 to m3 (or dm3 to m3) when using the Ideal Gas Equation (PV = nRT).

Always multiply the volume in cm3 by 10^-6 to convert to m3 before substituting it into the equation.

Forgetting to convert the isotopic mass of an element from g/mol to kg/mol (by dividing by 1000) when calculating mass of an ion in TOF calculations.

Divide the atomic mass by Avogadro's constant and then multiply by 10^-3 to get the mass of a single ion in kilograms.

Using square brackets [ ] instead of round parentheses ( ) when writing expressions for the equilibrium constant Kp.

Use partial pressures denoted as p(reactant) within round brackets. Square brackets are strictly reserved for concentrations in Kc.

Omitting essential state symbols in Born-Haber cycles or when writing equations for first/second ionization energy.

Always write down state symbols, paying special attention to gaseous states (g) for atoms and ions when defining ionization energies or lattice enthalpies.

Describing recrystallisation procedures without mentioning that the minimum volume of solvent must be used, or using a Bunsen burner instead of a water bath for flammable mixtures.

Always state 'dissolve the solid in the minimum volume of hot solvent' and specify heating with a water bath when solvents are flammable.

Improperly drawing vertical bonds to functional groups (e.g. connecting a carbon-carbon vertical chain directly to the H of an OH group rather than the O atom).

Ensure vertical bonds explicitly touch the atom that forms the bridge (e.g., C-O-H, not C-H-O) in structural diagrams.

AQA IAL · เคล็ดลับการสอบ

Chemistry (9620) เคล็ดลับการสอบ

This guide provides expert exam tips, structural details, and a breakdown of common mistakes for Oxford AQA International A-level Chemistry (9620) to help students maximize their marks across all five units.

อ่าน 4 นาทีอัปเดตเมื่อ: 21 มิ.ย. 2569

ภาพรวมข้อสอบ

จำนวนฉบับ

คะแนนเต็ม

360

เวลาสอบ

7ชม. 25นาที

ประเภทคำถาม

ฉบับ	เวลา	คะแนน	จำนวนข้อ	น้ำหนักคะแนน	ประเภทคำถาม
Unit 1: Inorganic 1 and Physical 1	1ชม. 30นาที	70	7	20%	Short Answer / Structural Drawing, Mathematical Calculation, Mechanism / Curly Arrow Outline
Unit 2: Organic 1 and Physical 1	1ชม. 30นาที	70	7	20%	Short Answer / Structural Drawing, Mathematical Calculation, Mechanism / Curly Arrow Outline
Unit 3: Inorganic 2 and Physical 2	1ชม. 30นาที	80	11	20%	Short Answer / Structural Drawing, Mathematical Calculation
Unit 4: Organic 2 and Physical 2	1ชม. 30นาที	80	9	20%	Short Answer / Structural Drawing, Mathematical Calculation, Mechanism / Curly Arrow Outline
Unit 5: Practical and synoptic	1ชม. 25นาที	60	33	20%	Short Answer / Structural Drawing, Mathematical Calculation, Multiple Choice

เกณฑ์เกรด

A*ABCDEU

ข้อกำหนดเครื่องคิดเลข

A scientific or graphical calculator is permitted. Graphical calculators must be in exam mode with all stored programs and data cleared before the exam; the calculator must not be able to retrieve stored text or formulae.

AO1: AO1: Knowledge and understanding of scientific ideas, processes, techniques and procedures (35%)
AO2: AO2: Application of knowledge and understanding to unfamiliar situations, qualitative and quantitative contexts (40%)
AO3: AO3: Analysis and evaluation of scientific information, experimental design and practical procedures (25%)

จัดทำจากข้อสอบเก่าและเกณฑ์การให้คะแนนจริง (2023–2025)

โปรแกรมเครื่องคิดเลข

Graph: zeros, intersections & turning points

Graphical calculator / GDC (exam mode)

วัตถุประสงค์: Plot a function to read its roots (zeros), points of intersection, and maxima/minima.

ใช้เมื่อใด: Checking solutions, sketching, or solving where an analytic method is hard.

ขั้นตอน

Graph the function(s) and use the built-in zero, intersect and maximum/minimum tools.

ข้อควรระวังในการสอบ: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.

Numerical equation solver

Graphical calculator / GDC (exam mode)

วัตถุประสงค์: Solve an equation or find a variable numerically when an algebraic route is long or implicit.

ใช้เมื่อใด: Iterative or implicit equations, or to confirm an algebraic solution.

ขั้นตอน

Use the equation/zero solver, entering the equation and a sensible starting estimate.

Numerical integration & differentiation

Graphical calculator / GDC (exam mode)

วัตถุประสงค์: Evaluate a definite integral \(\int_a^b f(x)\,dx\) or a gradient \(f'(x)\) at a point.

ใช้เมื่อใด: Checking calculus answers, or where only a numerical value is needed.

ขั้นตอน

Use the GDC's numeric integral / derivative function with the limits or the point.

Statistics & probability distributions

Graphical calculator / GDC (exam mode)

วัตถุประสงค์: 1-var/2-var statistics, linear regression, and cumulative binomial / normal / Poisson probabilities without tables.

ใช้เมื่อใด: Statistics questions and hypothesis tests.

ขั้นตอน

Enter data in the statistics editor, or use the distribution menu (binomial cdf, normal cdf, …).

ข้อผิดพลาดที่พบบ่อย

1highคะแนนที่เกี่ยวข้อง: 2Introduction to organic chemistry (Organic chemistry)
Drawing curly arrows that do not originate exactly from a lone pair of electrons or a bond, but rather start from empty space or from an atom label.
วิธีหลีกเลี่ยง: Ensure the tail of the curly arrow begins precisely on the double bond or the lone pair of the nucleophile/electrophile and points directly to the atom receiving the electrons.
2highคะแนนที่เกี่ยวข้อง: 1Amount of substance (Physical chemistry)
Failing to convert the volume of gas from cm3 to m3 (or dm3 to m3) when using the Ideal Gas Equation (PV = nRT).
วิธีหลีกเลี่ยง: Always multiply the volume in cm3 by 10^-6 to convert to m3 before substituting it into the equation.
3mediumคะแนนที่เกี่ยวข้อง: 2Atomic structure (Physical chemistry)
Forgetting to convert the isotopic mass of an element from g/mol to kg/mol (by dividing by 1000) when calculating mass of an ion in TOF calculations.
วิธีหลีกเลี่ยง: Divide the atomic mass by Avogadro's constant and then multiply by 10^-3 to get the mass of a single ion in kilograms.
4highคะแนนที่เกี่ยวข้อง: 1Equilibrium constant Kp for homogeneous systems (Physical chemistry)
Using square brackets [ ] instead of round parentheses ( ) when writing expressions for the equilibrium constant Kp.
วิธีหลีกเลี่ยง: Use partial pressures denoted as p(reactant) within round brackets. Square brackets are strictly reserved for concentrations in Kc.
5mediumคะแนนที่เกี่ยวข้อง: 1Thermodynamics (Physical chemistry)
Omitting essential state symbols in Born-Haber cycles or when writing equations for first/second ionization energy.
วิธีหลีกเลี่ยง: Always write down state symbols, paying special attention to gaseous states (g) for atoms and ions when defining ionization energies or lattice enthalpies.
6mediumคะแนนที่เกี่ยวข้อง: 2Organic analysis (Organic chemistry)
Describing recrystallisation procedures without mentioning that the minimum volume of solvent must be used, or using a Bunsen burner instead of a water bath for flammable mixtures.
วิธีหลีกเลี่ยง: Always state 'dissolve the solid in the minimum volume of hot solvent' and specify heating with a water bath when solvents are flammable.
7mediumคะแนนที่เกี่ยวข้อง: 1Alcohols (Organic chemistry)
Improperly drawing vertical bonds to functional groups (e.g. connecting a carbon-carbon vertical chain directly to the H of an OH group rather than the O atom).
วิธีหลีกเลี่ยง: Ensure vertical bonds explicitly touch the atom that forms the bridge (e.g., C-O-H, not C-H-O) in structural diagrams.

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