Organic chemistry marking scheme This is the marking scheme for quiz: C11 - Organic Chemistry Quiz Topic Guide: C11 - Organic Chemistry Total marks: 22 Accept equivalent displayed or structural formulae where bonds and atom connections are unambiguous. Section A: Multiple choice (5 marks) Q1 (1 mark) B — Alkenes have general formula $C_nH_{2n}$. [1] Q2 (1 mark) C — Volatility increases from the bottom to the top of the column. [1] ...
Reproduction Marking Scheme This is the marking scheme for quiz: B16 - Reproduction Quiz Topic Guide: B16 - Reproduction Total: 32 marks Q1 [1 mark] Answer: B. Two gamete nuclei fuse to form a diploid zygote. Q2 [1 mark] Answer: B. Transfer of pollen from anther to stigma. Q3 [1 mark] Answer: A. Water, oxygen, and a suitable temperature. Q4 [1 mark] Answer: B. LH. Q5 [1 mark] Answer: C. HIV is an STI-causing virus that may lead to AIDS. ...
Curved Graphs Quiz: Marking Scheme This is the marking scheme for quiz: M18 - Curved Graphs Quiz Topic Guide: M18 - Curved Graphs Total: 40 marks Accept equivalent notation and correct methods that produce a correct result. A — $y=(x-2)^2-3$ B — reciprocal graph with two branches B — $x=3$ C — tangent has the same gradient as the curve at the point of contact For $y=x^2-6x+5$: 1 mark: Finds the axis of symmetry as $x=3$, using $x=-b/(2a)$ or an equivalent method. 2 marks: Finds the turning point as $(3,-4)$. 1 mark for substituting $x=3$ correctly. 1 mark for obtaining $y=-4$ and stating the coordinates. 1 mark: Identifies the turning point as a minimum because the coefficient of $x^2$ is positive. For $y=-3/x$: ...
Magnetism and Electromagnetism - Marking Scheme This is the marking scheme for quiz: P7 - Magnetism and Electromagnetism Quiz Topic guide: P7 - Magnetism and Electromagnetism Multiple Choice uestions (3 × 3 marks = 9 marks) Forces and poles repel Correct answer: A (Both magnets have the same pole facing each other) Reason: Like poles (N-N or S-S) repel. Opposite poles (N-S) attract. Transformer turns ratio Correct answer: A (Ns > Np) Reason: Step-up transformer: V_s > V_p when N_s > N_p. Electromagnet with switch ...
Marking Scheme: Excretion This is the marking scheme for quiz: Excretion Quiz Study guide: Excretion Short Answer Questions 1. State the name of the gas excreted through the lungs and write the balanced chemical equation for its production during cellular respiration. Marks: 2 Gas name: carbon dioxide, CO₂ (1 mark) Balanced chemical equation: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O (1 mark) 2. What are the two main regions of the kidney? Describe their functions. ...