Enthalpy and entropy multiple choice questions

Enthalpy and Entropy

Total marks:0 / 15

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The bond enthalpy for the Cl-Cl bond is +243.0 kJ mol^-1.

What is the enthalpy change of atomisation of chlorine in kJ mol^-1?

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2 of 15

The energy cycle for the dissolving of magnesium chloride in water is

Energy cycle diagram for the dissolving of magnesium chloride in water showing enthalpy changes.

The enthalpy of hydration of the magnesium ion is -1,920 kJ mol^-1.

What is the enthalpy of hydration, in kJ mol^-1, of the chloride ion?

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3 of 15

Which of these changes has the largest increasein the entropy of the system?

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4 of 15

Energy is given out when one mole of gaseous magnesium ions is hydrated.

Mg²⁺_(g) + aq ➔ Mg²⁺_(aq)

This is more exothermic than the corresponding value for barium ions, Ba²⁺, because the

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5 of 15

Which change would have a negative ΔH value?

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Which pair of enthalpy changes will alwaysshare the same sign (i.e. both are always exothermic orboth are always endothermic)?

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7 of 15

Which of the following quantities, used in the calculation of the lattice enthalpy of lithium oxide, Li₂O, has a negative value?

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8 of 15

Which of the equations below represents the first electron affinity for oxygen?

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9 of 15

The ionic radii in nm of some ions are given below.

Table showing ionic radii in nanometres of some ions including Li+, Ca2+, F-, Cl-, O2-, and S2-.

Which of the following compounds has the most exothermic lattice energy? They all have the same crystal structure.

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10 of 15

Four changes W, X, Y and Z have the following signs for their ∆H and ∆S values.

Table showing the signs for enthalpy change and entropy change for W, X, Y, and Z.

Which of the following is a correct statement?

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11 of 15

The lattice enthalpy of calcium chloride can be calculated using three of the enthalpy changes below.

Which enthalpy change is notrequired?

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12 of 15

The table below shows standard entropies, S^ө.

Table showing standard entropies S in J K-1 mol-1 for CO gas, H2 gas, and CH3OH liquid.

What is the entropy change, ∆S^ө, in J mol^-1 K^-1, for the following reaction?

CO_(g) + 2H_2(g) ➔ CH₃OH_(l)

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13 of 15

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

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14 of 15

A reaction is exothermic and has a negative entropy change.

Which statement is correct?

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15 of 15

What occurs as group 2 is descended?

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