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

This is the equilibrium in a solution of bromine in water:

Br₂_(aq) + H₂O(l) <=> HOBr_(aq) + H⁺_(aq) + Br^-_(aq)

The orange colour of bromine disappears on adding

(i) sodium bromide

(ii) water

(iii) dilute hydrochloric acid

(iv) sodium hydroxide solution

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

Each of these statements is true. From which statement is it possible to predict, by application of Le Chatelier's principle that the solubility of sodium hydroxide increases with temperature?

Sodium hydroxide dissolves more rapidly in hot than in cold water.

When sodium hydroxide dissolves in water the process is exothermic

When sodium hydroxide dissolves in its nearly saturated solution the change is endothermic

A saturated solution of sodium hydroxide is in equilibrium with excess solid

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

Calculate the enthalpy change for the formation of one mole of hydrogen chloride gas from its elements given these average bond enthalpies: H-H bond enthalpy = 435 kJ mol^-1, Cl-Cl bond enthalpy = 243 kJ mol^-1 and H-Cl bond enthalpy = 432 kJ mol^-1

-93 kJ kJ mol^-1

-186 kJ mol^-1

-246 kJ mol^-1

-555 kJ mol^-1

5 / 10

Bubbling carbon dioxide into an aqueous solution of calcium hydroxide produces a white precipitate of:

calcium oxide

calcium carbonate

calcium hydrogencarbonate

calcium carbide

6 / 10

What is the oxidation number of CARBON in methanol

CH₃OH

7 / 10

What is the oxidation number of CHROMIUM in

Cr₂O₇^2-

8 / 10

What is the oxidation number of SULFUR in

SO₄²^-

9 / 10

What is the oxidation number of BROMINE in

BrO^-

10 / 10

What is the oxidation number of CARBON in

C₂H₆

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