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

Using enthalpies of formation Δ_fH, calculate the enthalpy of combustion Δ_cH of ethanol:

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

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.

-975 kJ mol^-1

-403 kJ mol^-1

-1369 kJ mol^-1

-797 kJ mol^-1

3 / 10

The standard enthalpy change of formation of N₂O_(g) is +82 kJ mol^-1. This shows that

N₂O_(g) is the most stable oxide of nitrogen

N₂O_(g) is more stable than the elements from which it forms

The decomposition of N₂O_(g) to its elements is exothermic

N₂O_(g) decomposes into its elements rapidly at room temperature

4 / 10

Hydrazine burns according to this equation: N₂H₄_(g) + O₂_(g) -> N₂_(g) + 2H₂O_(l)

Calculate the standard enthalpy change for the combustion of hydrazine given that the standard enthalpy of formation of hydrazine is +51 kJmol^-1 and of water is -286 kJ mol^-1

-235 kJ mol^-1

-337 kJ mol^-1

-521 kJ mol^-1

-623 kJ mol^-1

5 / 10

The total heat capacity of a calorimeter is 2000 J K^-1.

The standard enthalpy of combustion of propane is -2200 kJ mol^-1

Calculate the expected temperature rise on heating the calorimeter by burning 0.0500 mol of fuel from a propane burner assuming that all the energy heats the calorimeter.

Take care with units.

0.055 K

1.1 K

11 K

55 K

6 / 10

What is the oxidation number of CARBON in

CH₄

7 / 10

Which of these statements about atomic and ionic radii are true?

(i) Atomic radii increase down group 2

(ii) Ionic radii increase down group 7

(iii) Atomic radii decrease across period 3

(iv) In period 3 the ionic radii are smaller than the atomic radii

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

8 / 10

In the periodic table the elements are arranged in order of:

(i) atomic number

(ii) mass number

(iii) number of protons in the nucleus

(iv) number of protons and neutrons in the nucleus.

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

9 / 10

In the periodic table a periodic pattern is:

a trend across a period

a trend down a group

the difference between metals and non-metals

a repeating pattern from one period to the next

10 / 10

An example of a p-block element is:

aluminium

lithium

iron

zinc

Your score is

0%

Recent Posts

Categories