Practise

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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 109 of 137 · choose a topic above to narrow them down

SA-AC-PN-0031 markL2 StandardCalculatorAcidity

Phenol is more acidic than ethanol because

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SA-AC-PN-0041 markL2 StandardCalculatorRing reactions

Phenol reacts with bromine water to give

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SA-AC-PN-0052 marksL2 StandardCalculatorRing reactions

Calculate the mass (g) of 2,4,6-tribromophenol (

M_r

331) formed from 0.940 g of phenol (

M_r

94.0).

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SA-AC-PR-0012 marksL2 StandardCalculatorUncertainty

A burette has an uncertainty of ±0.05 cm³ per reading. Calculate the % uncertainty in a titre of 25.00 cm³.

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SA-AC-PR-0031 markL2 StandardCalculatorTitration

Before filling a burette, it should be rinsed with

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SA-AC-PR-0042 marksL2 StandardCalculatorCalorimetry and tests

Calculate q (J) when 50.0 g of solution warms by 6.5 °C (c = 4.18 J g⁻¹ K⁻¹).

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SA-AC-RD-0021 markL2 StandardCalculatorOxidation numbers

What is the oxidation number of S in

\mathrm{S_2O_3^{2-}}

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SA-AC-RD-0031 markL2 StandardCalculatorHalf-equations

How many electrons are in the half-equation

\mathrm{MnO_4^-+8H^++\_\,e^-\rightarrow Mn^{2+}+4H_2O}

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SA-AC-RD-0041 markL2 StandardCalculatorHalf-equations

How many H⁺ are needed in

\mathrm{Cr_2O_7^{2-}+\_\,H^++6e^-\rightarrow2Cr^{3+}+7H_2O}

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SA-AC-RD-0051 markL2 StandardCalculatorOxidation numbers

\mathrm{Cl_2+2OH^-\rightarrow Cl^-+ClO^-+H_2O}

, chlorine is

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SA-AC-RE-0021 markL2 StandardCalculatorOrders

Tripling [B] has no effect on the rate. The order with respect to B is

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SA-AC-RE-0042 marksL2 StandardCalculatork and half-life

A first-order reaction has k = 0.0231 s⁻¹. Calculate its half-life (s).

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SA-AC-RE-0051 markL2 StandardCalculatork and half-life

The units of k for a second-order reaction are

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SA-AC-S2-0011 markL2 StandardCalculatorAromatic routes

The first step to make phenylamine from benzene is

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SA-AC-S2-0021 markL2 StandardCalculatorAromatic routes

Methylbenzene can be converted to benzoic acid by

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SA-AC-S2-0031 markL2 StandardCalculatorAromatic routes

Benzene + CH₃COCl with AlCl₃ gives

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SA-AC-S2-0051 markL2 StandardCalculatorPlanning

The reaction type for benzene → nitrobenzene is

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SA-AC-SH-0031 markL2 StandardCalculatorVSEPR

What is the bond angle in

\mathrm{BF_3}

, in degrees?

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SA-AC-SH-0041 markL2 StandardCalculatorVSEPR

The shape of

\mathrm{SF_6}

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SA-AC-SH-0051 markL2 StandardCalculatorVSEPR

Water has a smaller bond angle than ammonia because

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