Theory

CH7 - EQUILIBRIA

(a) Complete Table 1.1 using relevant information from the Periodic Table.Table 1.1| | nucleon number | proton number | number of elec...

2024 Summer

2

Theory

CH7 - EQUILIBRIA

(a) Describe and explain the change, if any, to the percentage yield of NH$_3$(g) produced in B compared to A............................................

2024 Summer

4

Theory

CH7 - EQUILIBRIA

(a) Describe what is meant by dynamic equilibrium. .....................................................................................................

2024 Summer

2

Theory

CH7 - EQUILIBRIA

Nitrogen, $N_2$, is generally an unreactive molecule but it does react under certain conditions. (a) Give two reasons to explain the lack of reactivi...

2024 Spring

4

Theory

CH7 - EQUILIBRIA

(a) Define Le Chatelier’s principle....................................................................................................................

2024 Summer

2

Theory

CH7 - EQUILIBRIA

(a) Disodium phosphate, $(\text{Na}^+)_{2}(\text{HPO}_4^{2-})$, reacts with an acid to form monosodium phosphate, $\text{Na}^+(\text{H}_2\text{PO}_4^-...

2024 Winter

2

Theory

CH7 - EQUILIBRIA

(a) (i) Describe the trend in the solubility of the hydroxides of magnesium, calcium and strontium.Explain your answer...................................

2024 Summer

2

Theory

CH7 - EQUILIBRIA

(a) Equation 1 shows water acting as a Brønsted–Lowry acid. equation 1 \[ \text{H}_2\text{O} + \text{NO}_2^- \rightleftharpoons \text{HNO}_2 + \tex...

2024 Spring

2

Theory

CH7 - EQUILIBRIA

Iron is a transition metal in Group 8 of the Periodic Table.(a) (i) Explain why iron has variable oxidation states.......................................

2024 Spring

3

Theory

CH7 - EQUILIBRIA

(a) Nitrosyl chloride, NOCl, can be formed by the reaction between nitrogen monoxide and chlorine, as shown.$2NO + Cl_{2} \rightarrow 2NOCl$The initia...

2024 Summer

2

Theory

CH2 - ATOMIC STRUCTURE

(a) Complete the table to show the composition and identity of some atoms and ions.[Table]name of element | nucleon number | atomic number | number of...

2016 Summer

1

Theory

CH4 - STATES OF MATTER

D, E, F, and G are four consecutive elements in the fourth period of the Periodic Table. (The letters are not the actual symbols of the elements.)D is...

2016 Summer

1

Theory

CH10 - GROUP 2

The elements in Group 2, and their compounds, show many similarities and trends in their properties.(a) Magnesium, calcium, strontium and barium all r...

2016 Summer

1

Theory

CH14 - AN INTRODUCTION TO ORGANIC CHEMISTRY

This question is about molecules with molecular formula $C_4H_8$.(a) Give the structures of a pair of **positional** isomers with the formula $C_4H_8$...

2016 Summer

1

Theory

CH22 - ANALYTICAL TECHNIQUES

(a) Complete the diagram to show the mechanism of reaction 1. Include all necessary charges, partial charges, lone pairs and curly arrows.H3C—C—Br...

2016 Summer

Theory

CH2 - ATOMIC STRUCTURE

(a) Complete the table to show the composition and identity of some atoms and ions.[Table_1]name of element | nucleon number | atomic number | number ...

2016 Summer

2

Theory

CH5 - CHEMICAL ENERGETICS

The elements in Group 17, the halogens, and their compounds, show many similarities and trends in their properties. Some data are given for the elemen...

2016 Summer

3

Theory

CH6 - ELECTROCHEMISTRY

Acidified potassium dichromate(VI) can oxidise ethanedioic acid, $H_2C_2O_4$. The relevant half-equations are shown. $$Cr_2O_7^{2-} + 14H^+ + 6e^- \r...

2016 Summer

2

Theory

CH22 - ANALYTICAL TECHNIQUES

This question is about molecules with molecular formula $C_4H_8O_2$.(a) Give the structural formulae of the pair of extbf{chain} isomers with the for...

2016 Summer

2

Theory

CH17 - HYDROXY COMPOUNDS

A reaction sequence based on propan-1-ol is shown. (a) Reactions 1 and 2 can both be carried out using the same reagents. (i) Identify suitable rea...

2016 Summer

2