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Thermodynamics AQA A Level

Authored by Gareth Hart

Chemistry

12th Grade

Used 34+ times

Thermodynamics AQA A Level
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10 questions

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1.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which equation represents the process that occurs when the standard enthalpy of atomisation of iodine is measured?

1/2 I2(s) → I(g)

I2(s) → 2I(g)

1/2 I2(g) → I(g)

I2(g) → 2I(g)

2.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Lattice enthalpy values can be obtained from Born–Haber cycles and by calculations based on a perfect ionic model.


Which compound shows the greatest percentage difference between these two values?

CsF

CsI

LiF

LiI

3.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which one of the following has the most covalent character?

MgF2

MgBr2

AlF3

AlBr3

4.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

In which one of the following reactions is there a decrease in entropy?

[Fe(H2O)6]3+(aq) + 3C2O42- (aq) → [Fe(C2O4)3]3−(aq) + 6H2O(l)

[Cu(H2O)6]2+(aq) + EDTA4−(aq) → [Cu(EDTA)]2−(aq) + 6H2O(l)

[CoCl4]2−(aq) + 6H2O(l) → [Co(H2O)6]2+(aq) + 4Cl (aq)

Na2CO3(s) + 2H+(aq) → 2Na+(aq) + CO2(g) + H2O(l)

5.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Media Image

This question relates to the equilibrium gas-phase synthesis of sulphur trioxide:

2SO2(g) + O2(g) = 2SO3(g) (the = shows double arrows)

Thermodynamic data for the components of this equilibrium are shown in the image. This equilibrium, at a temperature of 585 K and a total pressure of 540 kPa, occurs in a vessel of volume 1.80 dm3. At equilibrium, the vessel contains 0.0500 mol of SO2(g), 0.0800 mol of O2(g) and 0.0700 mol of SO3(g). The standard entropy change for this reaction is

−222 J K−1 mol−1

−195 J K−1 mol−1

−186 J K−1 mol−1

+198 J K−1 mol−1

6.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Media Image

he following information concerns the equilibrium gas-phase synthesis of methanol. CO(g) + 2H2(g) = CH3OH(g)

At equilibrium, when the temperature is 68 °C, the total pressure is 1.70 MPa.

The number of moles of CO, H2 and CH3OH present are 0.160, 0.320 and 0.180, respectively.

Thermodynamic data are given. The standard entropy change for this reaction is?

−220 J K−1 mol−1

+220 J K−1 mol−1

−89 J K−1 mol−1

+89 J K−1 mol−1

7.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

A reaction is exothermic and has a negative entropy change. Which statement is correct?

The reaction is always feasible

The reaction is feasible above a certain temperature

The reaction is feasible below a certain temperature

The reaction is never feasible

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