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

Which of these are examples of heterogeneous equilibria?

(i) CaCO₃_(s) <=> CaO_(s) + CO₂_(g)

(ii) Fe²⁺_(aq) + Ag⁺_(aq) <=> Fe³⁺_(aq) + Ag_(s)

(iii) 3Fe_(s) + 4H₂O_(g) <=> Fe₃O₂_(s) + 4H₂_(g)

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

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

Which of these reactions can be reversed by changing the conditions in a typical advanced chemistry laboratory?

(i) CuSO₄.5H₂O_(s) -> CuSO₄_(s) + 5H₂O(l)

(ii) 2Mg_(s) + O₂_(g) -> 2MgO_(s)

(iii) NH₃_(g) + HCl_(g) -> NH₄Cl_(s)

(iv) CH₄_(g) + 2O₂_(g) -> CO₂_(g) + 2H₂O_(l)

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

Using mean bond dissociation enthalpies, estimate the enthalpy of combustion Δ_cH of liquid ethanol

C₂H₅OH_(l) + 3O₂_(g) => 2CO₂_(g) + 3H₂O_(l)

1214 kJ mol^-1

-1274 kJ mol^-1

1725 kJ mol^-1

-1725 kJ mol^-1

4 / 10

Using enthalpies of combustion Δ_cH, calculate the enthalpy change for the hydrogenation of propene:

C₃H₆_(g) + H_2(g) => C₃H_8(g)

Select the data from theenthalpies of combustion Δ_cH.

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

-43.9 kJ mol^-1

63.5 kJ mol^-1

-346 kJ mol^-1

-125.1 kJ mol^-1

5 / 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

6 / 10

What are the standard conditions for measuring standard enthalpy changes?

0 K and 100 kPa

273 K and 100 kPa

298 K and 100 kPa

300 K and 100 kPa

7 / 10

The carbonates of group 2 metals (M):

(i) have the formula of the form MCO₃

(ii) are insoluble in water

(iii) become more difficult to decompose on heating down the group

(iv) decompose on heating to the metal and carbon dioxide

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

8 / 10

What is the oxidation number of CHLORINE in

ClO₂

9 / 10

What is the oxidation number of OSMIUM in

OsO₄

10 / 10

An element which consists of a giant structure of atoms held together by covalent bonding is:

iodine

magnesium

silicon

nitrogen

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