CCEA AS Life and Health Sciences: where the 225 marks across Body Systems, Physical Chemistry and Material Science go, the unit-conversion and definition slips that cost the most, and how to structure the QWC question in each paper.
อ่าน 4 นาทีอัปเดตเมื่อ: 3 ก.ย. 2569
ภาพรวมข้อสอบ
จำนวนฉบับ
3
คะแนนเต็ม
225
เวลาสอบ
4ชม. 30นาที
ประเภทคำถาม
12
ฉบับ
เวลา
คะแนน
จำนวนข้อ
น้ำหนักคะแนน
ประเภทคำถาม
AS 2: Human Body Systems
1ชม. 30นาที
75
7
33%
Short Answer & Anatomical Recall, Data Analysis & Evaluation, Graphical Construction & Interpretation, Quality of Written Communication (QWC), Biochemical Explanation
AS 3: Physical Chemistry in Industrial Processes
1ชม. 30นาที
75
5
33%
Industrial Recall & Process Definition, Stoichiometry & Molar Yield Calculations, Procedural Practical Description, Enthalpy & Calorimetry Calculations, Quality of Written Communication (QWC), Equilibrium & Rate Interpretation
AS 5: Material Science
1ชม. 30นาที
75
7
34%
Matching & Material Categorisation, Microscopic Structure & Recall, Material Property Data Interpretation, Quality of Written Communication (QWC), Mechanical Stress/Strain & Young Modulus Calculations
เกณฑ์เกรด
ABCDE
ข้อกำหนดเครื่องคิดเลข
No subject-specific calculator restriction is stated beyond the general CCEA and JCQ rules: calculators are permitted for the numeric calculations in all three papers (stoichiometry, enthalpy, stress and strain), but must not have any retrievable information stored in them and must not offer symbolic algebra manipulation, language translation, or communication with other machines or the internet.
AO1: AO1: demonstrate knowledge and understanding of scientific ideas, processes, techniques and procedures. (45%)
AO2: AO2: apply knowledge and understanding of scientific ideas, processes, techniques and procedures in a range of theoretical and practical contexts, and when handling qualitative and quantitative data, to solve scientific problems. (31%)
AO3: AO3: analyse, interpret and evaluate a range of scientific information, ideas and evidence to make judgements and reach conclusions, including in relation to issues, and to refine practical design and procedures. (24%)
วัตถุประสงค์: Hold an intermediate value, such as a converted diameter or a partial enthalpy sum, without retyping it later in the same question.
ใช้เมื่อใด: Hess cycle and stress/strain calculations where an early converted value or sub-total is needed again two or three steps later.
ขั้นตอน
Calculate the value, press the memory store key and a letter to save it, continue with the rest of the working, then recall it with the same letter when needed again.
ข้อควรระวังในการสอบ: Clear the memory at the start of the exam and only store values calculated live during the paper, this is not a saved program.
Stepwise arithmetic, not calculator-only working
Any CCEA-permitted scientific calculator
วัตถุประสงค์: Keep the shown method that earns credit visible on the page, even where the final number is wrong.
ใช้เมื่อใด: Stoichiometry, molar yield and titration questions in AS 3, and stress/strain calculations in AS 5.
ขั้นตอน
Write the formula and the substitution with units on paper first, then key the numbers into the calculator only for the arithmetic step, and copy the result back onto the page.
ข้อควรระวังในการสอบ: The calculator performs only the arithmetic here, live during the exam, it holds no stored formulae or notes.
Statistics mode for repeated readings
Casio fx-991EX ClassWiz (or equivalent)
วัตถุประสงค์: Find the mean of several repeat readings quickly and accurately.
ใช้เมื่อใด: Practical description or data questions involving repeated titre volumes or extension measurements.
ขั้นตอน
Open statistics mode, key in each repeat reading pressing equals after each, then read the mean from the variable menu and quote it with the correct number of significant figures.
ข้อควรระวังในการสอบ: This uses only the readings given or measured during the exam, entered live, nothing is stored from before the exam.
ข้อผิดพลาดที่พบบ่อย
1highคะแนนที่เกี่ยวข้อง: 2Practical calculations, units
Leaving a wire's diameter or a volume in millimetres or cm3 when substituting into a formula, instead of converting to metres or dm3 first.
วิธีหลีกเลี่ยง: Convert every measurement to the units the formula needs as a separate first line, before any substitution.
2highคะแนนที่เกี่ยวข้อง: 2Definitions, energetics and homeostasis
Giving an incomplete definition of standard enthalpy change or negative feedback, missing 'one mole' and 'standard conditions', or missing that the corrective mechanism switches off at the set point.
วิธีหลีกเลี่ยง: Learn definitions as complete sentences with every required clause, not as a single keyword, and write out the full sentence in the answer.
Confusing adsorption with absorption when describing a heterogeneous catalyst such as a car exhaust converter.
วิธีหลีกเลี่ยง: State explicitly that adsorption is the catalyst's surface binding gas molecules, distinct from absorption, which draws a substance into the bulk of a material.
4highคะแนนที่เกี่ยวข้อง: 3Energetics, Hess cycles
Forgetting to multiply standard enthalpy of formation or combustion values by the stoichiometric coefficient for each species in a Hess cycle, for example missing the factor of two for water in a combustion equation.
วิธีหลีกเลี่ยง: Write the balanced equation first and label each species with its coefficient before pulling any enthalpy value into the cycle.
5mediumคะแนนที่เกี่ยวข้อง: 2Material science, stress and strain
Calculating cross-sectional area for Young's modulus questions from the diameter instead of the radius, or leaving the measurement in millimetres.
วิธีหลีกเลี่ยง: Halve the diameter to get the radius and convert to metres before squaring in the area formula.
Drawing a lower-temperature Maxwell-Boltzmann curve with its peak shifted to the right, or starting a rate or stress-strain graph away from the origin.
วิธีหลีกเลี่ยง: Remember a lower temperature shifts the peak left and higher, and always start these curves cleanly through the origin.
7highคะแนนที่เกี่ยวข้อง: 4QWC, extended response
Writing a generic, unbalanced Quality of Written Communication answer that covers only one side of a two-sided prompt, such as only risks and not benefits.
วิธีหลีกเลี่ยง: List every bullet point in the question stem before writing, and structure the answer so each one gets its own paragraph with specialist vocabulary.
8mediumคะแนนที่เกี่ยวข้อง: 2Practical methods
Describing a practical method without naming the specific apparatus, such as a volumetric flask or micrometer screw gauge, or without stating that readings were repeated.
วิธีหลีกเลี่ยง: Name the exact piece of equipment for every step of the method, and state the number of repeat readings taken.