Free Printable AS chapter 6 energetics 2

1.

Which equation represents the change corresponding to the enthalpy change of atomization of iodine?

a)

$I_2(g)\rightarrow2I(g)$

b)

$I_2(l)\rightarrow2I(g)$

c)

$I_2(s)\rightarrow2I(g)$

d)

$\frac{1}{2}I_2(s)\rightarrow I(g)$

2.

For which of the following reactions does the value of ΔH^Θ represent both a standard enthalpy change of formation and a standard enthalpy change of combustion?

a)

$C(s)\ +O_2\left(g\right)\rightarrow CO_2(g)$

b)

$C(g)\ +\frac{1}{2}O_2\left(g\right)\rightarrow CO(g)$

c)

$2C(s)\ +O_2\left(g\right)\rightarrow2CO(g)$

d)

$CO(g)\ +\frac{1}{2}O_2\left(g\right)\rightarrow CO_2(g)$

3.

The enthalpy change for the neutralization reaction below is − 114 kJ mol ^-1.

2NaOH (aq) + H₂SO₄(aq) ----> Na₂SO₄(aq) + 2H₂O(l)

Use this information to suggest the most likely value for the enthalpy change for the following neutralization reaction.

Ba(OH)₂ (aq) + 2HCl(aq) ----> BaCl₂(aq) + 2H₂O(l)

a)

− 57 kJ mol ^-1

b)

− 76 kJ mol ^-1

c)

− 114 kJ mol ^-1

d)

− 228 kJ mol ^-1

4.

Which of the following processes is endothermic?

a)

the condensation of steam

b)

the freezing of water

c)

the decomposition of calcium carbonate into calcium oxide and carbon dioxide

d)

the reaction between hydrogen ions and hydroxide ions

5.

The enthalpy changes of formation of gaseous ethene and gaseous ethane are 52 kJ mol ^-1 and − 85 kJ mol ^-1 respectively at 298 K.

What is the enthalpy change of reaction at 298 K for the following process?

C₂H₄(g) + H₂(g) ---> C₂H₆(g)

a)

− 137 kJ mol ^-1

b)

− 33 kJ mol ^-1

c)

+ 33 kJ mol ^-1

d)

+ 137 kJ mol ^-1

6.

The value of the enthalpy change for the process represented by the equation

K(s) ---> K⁺(g) + e^-

is equal to

a)

the electron affinity(电子亲合/吸引）of potassium

b)

the enthalpy change of vaporization of potassium

c)

the sum of the enthalpy change of vaporization of potassium and the first ionization energy of potassium

d)

the sum of the enthalpy change of atomization and the electron affinity of sodium

7.

Which one of the following statements about an endothermic reaction is correct?

a)

The energy absorbed in bond breaking is greater than the energy released in bond forming

b)

The energy absorbed in bond breaking is less than the energy released in bond forming

c)

The energy released in bond breaking is greater than the energy absorbed in bond forming

d)

The energy released in bond breaking is less than the energy absorbed in bond forming

8.

Which statement about the enthalpy level diagram below is correct?

a)

The reaction is endothermic

b)

More bonds are formed than are broken

c)

$\Delta$ H represents the enthalpy change of combustion of ethanol

d)

$\Delta$ H represents the enthalpy change of formation of carbon dioxide

9.

Hydrogen reacts with chlorine to form hydrogen chloride: H₂(g) + Cl₂(g) → 2HCl(g)

Which one of the values below gives the correct value for the enthalpy change for this reaction? (Use the bond energies E(H-H) = 436 kJ mol⁻¹, E(Cl-Cl) = 243 kJ mol⁻¹, E(H-Cl) = 432 kJ mol⁻¹)

a)

+ 185 kJ mol⁻¹

b)

- 185 kJ mol⁻¹

c)

+ 92.5 kJ mol⁻¹

d)

- 92.5 kJ mol⁻¹

10.

An enthalpy cycle for finding the enthalpy change of reaction ∆Hr is shown below.

Which one of these equations relating to this enthalpy cycle is correct?

a)

$\Delta H_{r\ }=\Delta H_{1\ }+\Delta H_{2\ }$

b)

$\Delta H_{r\ }=-\Delta H_{2\ }-\Delta H_{1\ }$

c)

$\Delta H_{r\ \ }=\Delta H_{1\ }-\Delta H_{2\ }$

d)

$\Delta H_{r\ \ }=\Delta H_{2\ }-\Delta H_{1\ }$

AS chapter 6 energetics 2

Total questions: 10

Worksheet time: 10mins

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