Practise

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2730 questions · page 107 of 137 · choose a topic above to narrow them down

SA-AC-KP-0031 markL2 StandardCalculatorKp

Increasing total pressure on an equilibrium mixture

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SA-AC-KP-0041 markL2 StandardCalculatorKsp

The Ksp expression for PbI₂ is

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SA-AC-MC-0023 marksL2 StandardCalculatorTitrations

25.0\ \text{cm}^3

\mathrm{Na_2CO_3}

needs

23.50\ \text{cm}^3

0.150\ \text{mol dm}^{-3}

HCl.

\mathrm{Na_2CO_3+2HCl\rightarrow2NaCl+H_2O+CO_2}

. Calculate

c(\mathrm{Na_2CO_3})

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SA-AC-MC-0033 marksL2 StandardCalculatorReacting masses

5.00

g of

\mathrm{CaCO_3}

(

M_r=100

) reacts with excess HCl. What volume of CO₂ forms at r.t.p., in cm³?

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SA-AC-MC-0041 markL2 StandardCalculatorReacting masses

0.10

mol

\mathrm{N_2}

and

0.24

mol

\mathrm{H_2}

react:

\mathrm{N_2+3H_2\rightarrow2NH_3}

. The limiting reagent is

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SA-AC-MC-0052 marksL2 StandardCalculatorReacting masses

Using

0.24

mol

\mathrm{H_2}

(limiting) in

\mathrm{N_2+3H_2\rightarrow2NH_3}

, what is the maximum moles of

\mathrm{NH_3}

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SA-AC-MO-0023 marksL2 StandardCalculatorFormulae

A compound contains 40.0% C, 6.7% H and 53.3% O. Its

M_r

is 180. How many carbon atoms are in one molecule?

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SA-AC-MO-0043 marksL2 StandardCalculatorEquations

4.92

g of

\mathrm{MgSO_4\cdot xH_2O}

is heated to give

2.40

g of anhydrous

\mathrm{MgSO_4}

(

M_r=120.4

). Find

x

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SA-AC-MO-0052 marksL2 StandardCalculatorEquations

Calculate the percentage atom economy for making ethanol by fermentation:

\mathrm{C_6H_{12}O_6\rightarrow2C_2H_5OH+2CO_2}

(

M_r

: ethanol 46, CO₂ 44).

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SA-AC-NM-0021 markL2 StandardCalculator¹³C NMR

How many peaks are in the ¹³C NMR spectrum of butan-2-ol,

\mathrm{CH_3CH(OH)CH_2CH_3}

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SA-AC-NM-0031 markL2 StandardCalculator¹H NMR

A CH₃ group next to a CH₂ group appears as a

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SA-AC-NM-0041 markL2 StandardCalculator¹H NMR

TMS is used in NMR because it

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SA-AC-NM-0051 markL2 StandardCalculator¹H NMR

CDCl₃ is used as the solvent because

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SA-AC-NS-0021 markL2 StandardCalculatorNitrogen compounds

The shape of the ammonium ion, NH₄⁺, is

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SA-AC-NS-0031 markL2 StandardCalculatorNitrogen compounds

Ammonia acts as a base because

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SA-AC-NS-0041 markL2 StandardCalculatorNitrogen compounds

Warming ammonium chloride with sodium hydroxide produces

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SA-AC-NS-0051 markL2 StandardCalculatorPollution

Nitrogen monoxide forms in car engines because

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SA-AC-OB-0031 markL2 StandardCalculatorMechanisms

Homolytic fission of a covalent bond produces

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SA-AC-OB-0041 markL2 StandardCalculatorIsomerism

Which compound shows E/Z isomerism?

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SA-AC-OB-0051 markL2 StandardCalculatorIsomerism

Butan-1-ol and butan-2-ol are

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