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

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Some intercontinental jet airliners use kerosene as fuel. The formula of kerosene may be taken as $C_{14}H_{30}$.(a) To which homologous series of com...

2011 Summer

6

Theory

CH15 - HYDROCARBONS

(a) (i) What is meant by the term `cracking` and why is it carried out?..................................................................................

2011 Summer

4

Theory

CH10 - GROUP 2

(a) State the formula of each of the calcium compounds U to Y.   U V W X Y (b) Compound Y may be converted into compound V. Out...

2011 Summer

2

Theory

CH18 - CARBONYL COMPOUNDS

Ketones are widely used as solvents and as intermediates in the chemical industry.Ketones contain the reactive keto group, $\text{C=O}$.(a) Propanone,...

2011 Summer

3

Theory

CH5 - CHEMICAL ENERGETICS

(a) When calcium carbide is reacted with water, ethyne and calcium hydroxide are formed. Construct a balanced equation for this reaction. (b) (i) Wh...

2011 Summer

2

Theory

CH7 - EQUILIBRIA

Ethanoic acid can be reacted with alcohols to form esters, an equilibrium mixture being formed.$$\text{CH}_3\text{CO}_2\text{H} + \text{ROH} \rightlef...

2011 Summer

3

Theory

CH16 - HALOGEN DERIVATIVES

(a) Use relevant bond energies from the Data Booklet, and the equation below to calculate a value for the bond energy of the C–F bond.CH$_2$ = CH$_2...

2011 Summer

3

Theory

CH10 - GROUP 2

(a) State the formula of each of the barium compounds R to W.R .................................... S ....................................T .............

2011 Summer

1

Theory

CH6 - ELECTROCHEMISTRY

(a) (i) Describe, with the aid of a fully labelled diagram, the industrial electrolysis of brine in a diaphragm cell. State what each electrode is mad...

2011 Summer

4

Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Although there are many different types of food eaten around the world, animal fats and/or vegetable oils are commonly used in cooking.Animal fats and...

2011 Summer

2