Period Table & Energy Random Retrieval

This quiz contains all the questions in the Period Table & Energy section. The website will pick 10 questions at random.

1 / 10

The reaction of nitrogen with hydrogen to form ammonia is exothermic. Which of these changes increases the proportion of ammonia in an equilibrium mixture of nitrogen, hydrogen and ammonia.

(i) raising the pressure at constant temperature

(ii) raising the temperature at constant pressure

(iii) decreasing the volume at constant temperature

(iv) adding a catalyst

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

The enthalpy of combustion Δ_cH of butan-1-ol = -2670 kJ mol^-1

Using this figure and data from the 'Selection of Enthalpies of Formation and Combustion' shown above, calculate the enthalpy of formation Δ_fH of liquid butan-1-ol

A Hess Cycle should be drawn to help you calculate this.

If this question was generated from Random Retrieval, this data can also be found in TOOLS>Data Sheets.

-336 kJ mol^-1

808 kJ mol^-1

846 kJ mol^-1

-569 kJ mol^-1

3 / 10

Using enthalpies of combustion Δ_cH, calculate the enthalpy change for the cracking of butane:

C₄H₁₀_(g) => C₂H₆_(g) + C₂H₄_(g)

Select the data from the 'Selection of Enthalpies of Formation and Combustion' shown above.

If this question was generated from Random Retrieval, this data can also be found in TOOLS>Data Sheets.

46.9 kJ mol^-1

93.8 kJ mol^-1

84.5 kJ mol^-1

188 kJ mol^-1

4 / 10

Using enthalpies of formation Δ_fH, calculate the enthalpy change for the following reaction.

CaCO₃_(s) => CaO_(s) + CO₂_(g)

Select the data from the 'Selection of Enthalpies of Formation and Combustion'.

If this question was generated from Random Retrieval, this data can also be found in TOOLS>Data Sheets.

-777 kJ mol^-1

81.5 kJ mol^-1

178 kJ mol^-1

-178 kJ mol^-1

5 / 10

The standard enthalpy of combustion of methane is -890 kJ mol^-1. Calculate the energy given out on burning 3.2 g methane.

178 kJ

208 kJ

2492 kJ

4450 kJ

6 / 10

An example of an endothermic change is the:

reaction of methane with oxygen

melting of ice

condensation of steam

neutralisation of ammonia with hydrochloric acid

7 / 10

Which of these comparative statements are true?

(i) a calcium atom is larger than a calcium ion

(ii) a calcium atom has a larger radius than a magnesium atom

(iii) calcium has a smaller first ionisation energy than magnesium

(iv) a calcium ion is smaller than a magnesium ion

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

8 / 10

What is the oxidation number of MANGANESE in

MnO₄^-

9 / 10

What is the oxidation number of SULFUR in

SO₄²^-

10 / 10

What is the oxidation number of OSMIUM in

OsO₄

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