Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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2730 questions · page 108 of 137 · choose a topic above to narrow them down

SA-AC-OP-0021 markL2 StandardCalculatorChiral centres

Which molecule has a chiral centre?

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SA-AC-OP-0031 markL2 StandardCalculatorPolarised light

Enantiomers differ in

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SA-AC-OP-0041 markL2 StandardCalculatorPolarised light

A racemic mixture is optically inactive because

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SA-AC-OP-0051 markL2 StandardCalculatorChiral centres

A molecule has 3 chiral centres. What is the maximum number of stereoisomers?

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SA-AC-PD-0021 markL2 StandardCalculatorAmino acids

In strongly acidic solution, glycine exists as

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SA-AC-PD-0032 marksL2 StandardCalculatorPeptides

Calculate

M_r

of the dipeptide formed from glycine (

M_r

75) and alanine (

M_r

89).

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SA-AC-PD-0041 markL2 StandardCalculatorPeptides

How many water molecules are released when 5 amino acids form a single polypeptide chain?

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SA-AC-PD-0051 markL2 StandardCalculatorPeptides

Proteins are hydrolysed in the lab by

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SA-AC-PE-0021 markL2 StandardCalculatorPhysical trends

The period 3 element with the highest melting point is

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SA-AC-PE-0031 markL2 StandardCalculatorPhysical trends

Sulfur has a higher melting point than phosphorus because

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SA-AC-PE-0041 markL2 StandardCalculatorOxides and chlorides

The pH of the solution formed when sodium oxide reacts with water is about

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SA-AC-PE-0051 markL2 StandardCalculatorOxides and chlorides

Which period 3 oxide is amphoteric?

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SA-AC-PH-0022 marksL2 StandardCalculatorStrong acids and bases

Calculate the pH of 0.0500 mol dm⁻³ NaOH at 298 K (

K_w=1.00\times10^{-14}

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SA-AC-PH-0051 markL2 StandardCalculatorBuffers and curves

A buffer could be made from

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SA-AC-PL-0021 markL2 StandardCalculatorPlanning

Investigating how concentration affects rate, a controlled variable is

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SA-AC-PL-0032 marksL2 StandardCalculatorEvaluation

Measured ΔH = −52.0 kJ mol⁻¹; accepted value −57.1 kJ mol⁻¹. Calculate the % error.

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SA-AC-PL-0041 markL2 StandardCalculatorEvaluation

Repeating an experiment and averaging reduces

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SA-AC-PL-0051 markL2 StandardCalculatorEvaluation

A thermometer that always reads 1 °C too high causes

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SA-AC-PN-0011 markL2 StandardCalculatorAcidity

Which reacts with sodium hydroxide but not with sodium carbonate?

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SA-AC-PN-0021 markL2 StandardCalculatorAcidity

Order of increasing acidity:

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