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

For which of these equilibria does a change in pressure have no effect on the yield of substances on the right-hand side of the equation?

(i) CH₄_(g) + H₂O_(g) <=> 3H₂_(g) + CO_(g)

(ii) 2HI_(g) <=> H₂_(g) + I₂_(g)

(iii) 2SO₂_(g) + O₂_(g) <=> 2SO₃_(g)

(iv) H₂O_(g) + CO_(g) <=> H₂_(g) + CO₂_(g)

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 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

3 / 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

4 / 10

Which of these systems is NOT in a state of dynamic equilibrium?

A blue Bunsen flame

Ice and water at 273 K

Nitrogen dioxide and dinitrogen tetroxide in a sealed tube

Mercury and mercury vapour in a barometer tube

5 / 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

6 / 10

The oxidising agent used to extract bromine from sea water in a displacement reaction is:

chlorine

iodine

oxygen

sulfur dioxide

7 / 10

In which of these molecules do the intermolecular forces arise largely from attractions between temporary dipoles?

I₂

HCl

HF

ICl

8 / 10

Which of these ions has the greatest polarising power?

Ba²⁺

Sr²⁺

Ca²⁺

Mg²⁺

9 / 10

What is the oxidation number of CARBON in methanal

CH₂O

10 / 10

Which of these true statements help to explain why the values of the first ionisation enthalpies (energies) of the group 1 metals fall down the group from lithium to caesium?

(i) Down the group, the outer electron gets further from the nucleus

(ii) The charge on the nucleus increases down the group

(iii) Greater shielding means that the attraction between the nucleus and the outer electron reduces down the group

(iv) In all the atoms the outer electron is an s-electron

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

Your score is

0%

Recent Posts

Categories