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

SA-OC-EX-0031 markL2 StandardCalculatorBlast furnace

The main reducing agent in the blast furnace is

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SA-OC-EX-0041 markL2 StandardCalculatorBlast furnace

Limestone is added to the blast furnace to

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SA-OC-EX-0051 markL2 StandardCalculatorAluminium

Cryolite is used in the extraction of aluminium to

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SA-OC-FA-0031 markL2 StandardCalculatorCrude oil

Compared with petrol, fuel oil molecules are

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SA-OC-FA-0051 markL2 StandardCalculatorCombustion

Incomplete combustion of methane produces

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SA-OC-FE-0031 markL2 StandardCalculatorBalancing

Balance:

\mathrm{N_2+\_\,H_2\rightarrow 2NH_3}

. What number goes in front of

\mathrm{H_2}

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SA-OC-FZ-0031 markL2 StandardCalculatorNPK

Ammonium sulfate is made from ammonia and

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SA-OC-FZ-0042 marksL2 StandardCalculatorNitrogen %

Calculate the percentage by mass of nitrogen in ammonium nitrate,

\mathrm{NH_4NO_3}

(

M_r=80

; N 14).

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SA-OC-FZ-0052 marksL2 StandardCalculatorNitrogen %

Calculate the percentage by mass of nitrogen in urea,

\mathrm{CO(NH_2)_2}

(

M_r=60

; N 14).

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SA-OC-GR-0041 markL2 StandardCalculatorGroup VII

Which reaction happens?

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SA-OC-GR-0051 markL2 StandardCalculatorGroup I

Potassium reacting with water is seen to

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SA-OC-GS-0041 markL2 StandardCalculatorGiant covalent

Diamond does not conduct electricity because

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SA-OC-MC-0012 marksL2 StandardCalculatorReacting masses

\mathrm{CaCO_3\rightarrow CaO+CO_2}

. What mass of

\mathrm{CaO}

(

M_r=56

) forms from

25

g of

\mathrm{CaCO_3}

(

M_r=100

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SA-OC-MC-0031 markL2 StandardCalculatorGas volumes

How many moles of gas are in

480\ \mathrm{cm^3}

at r.t.p.?

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SA-OC-MC-0042 marksL2 StandardCalculatorConcentration

0.10

mol of NaOH is dissolved to make

250\ \mathrm{cm^3}

of solution. Calculate the concentration in

\mathrm{mol/dm^3}

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SA-OC-MC-0052 marksL2 StandardCalculatorConcentration

How many moles of HCl are in

20.0\ \mathrm{cm^3}

0.50\ \mathrm{mol/dm^3}

hydrochloric acid?

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SA-OC-MO-0042 marksL2 StandardCalculatorThe mole

Calculate the mass of

0.25

mol of

\mathrm{CaCO_3}

. (

M_r=100

)

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SA-OC-MO-0052 marksL2 StandardCalculatorRelative mass

Calculate the percentage by mass of nitrogen in ammonium nitrate,

\mathrm{NH_4NO_3}

(

M_r=80

; N = 14).

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SA-OC-MP-0031 markL2 StandardCalculatorAlloys

Alloys are harder than pure metals because

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SA-OC-MP-0051 markL2 StandardCalculatorMetal properties

Aluminium is used to make aircraft because it

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