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

SA-OC-AI-0011 markL1 FoundationCalculatorComposition of air

What percentage of clean dry air is nitrogen, approximately?

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SA-OC-AI-0021 markL1 FoundationCalculatorPollutants

Carbon monoxide is produced by

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SA-OC-AK-0011 markL1 FoundationCalculatorBromine water test

Bromine water added to an alkene turns

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SA-OC-AK-0021 markL1 FoundationCalculatorCracking

Cracking is used to

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SA-OC-AL-0011 markL1 FoundationCalculatorMaking ethanol

Fermentation of glucose produces ethanol and

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SA-OC-AT-0011 markL1 FoundationCalculatorSubatomic particles

How many neutrons are in an atom of

^{23}_{11}\mathrm{Na}

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SA-OC-AT-0021 markL1 FoundationCalculatorSubatomic particles

How many electrons are in an atom of

^{40}_{20}\mathrm{Ca}

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SA-OC-AT-0031 markL1 FoundationCalculatorSubatomic particles

The relative charge of a neutron is

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SA-OC-AT-0041 markL1 FoundationCalculatorElectron shells

The electronic configuration of magnesium (

Z=12

) is

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SA-OC-CB-0011 markL1 FoundationCalculatorCovalent bonds

A covalent bond is

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SA-OC-CB-0021 markL1 FoundationCalculatorCovalent bonds

How many covalent bonds does a carbon atom form in methane,

\mathrm{CH_4}

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SA-OC-CB-0041 markL1 FoundationCalculatorCovalent bonds

Which molecule contains a triple bond?

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SA-OC-CB-0051 markL1 FoundationCalculatorProperties

Simple molecular substances have low boiling points because

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SA-OC-CE-0011 markL1 FoundationCalculatorElectroplating

To electroplate a key with nickel, the key should be

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SA-OC-CE-0021 markL1 FoundationCalculatorElectroplating

A suitable electrolyte for copper plating is

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SA-OC-CH-0012 marksL1 FoundationCalculatorRf values

A spot moves

4.5

cm and the solvent front

9.0

cm. Calculate

R_f

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SA-OC-CH-0021 markL1 FoundationCalculatorMethod

The baseline in chromatography is drawn in pencil because

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SA-OC-CH-0041 markL1 FoundationCalculatorRf values

A pure substance produces

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SA-OC-CO-0011 markL1 FoundationCalculatorRusting

Rusting of iron needs

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SA-OC-CO-0021 markL1 FoundationCalculatorRusting

Rust is

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