Theory

CH5 - CHEMICAL ENERGETICS

Separate samples of $Na_2CO_3$ and $NaHCO_3$ react with $HCl(aq)$ to produce the same products, as shown in Table 2.1.[Table_1](a) Complete the reacti...

2024 Summer

2

Theory

CH5 - CHEMICAL ENERGETICS

(a) Write an equation to show the reaction for the standard enthalpy change of formation of $\text{H}_2\text{O}$. Include state symbols..................

2024 Summer

3

Theory

CH5 - CHEMICAL ENERGETICS

(a) Nitrogen is found in inorganic compounds such as nitrogen oxides (NO\(_x\)), nitrates and nitric acid.(i) Identify one natural and one man-made oc...

2024 Winter

3

Theory

CH5 - CHEMICAL ENERGETICS

(a) Define enthalpy change of formation..................................................................................................................

2024 Summer

4

Theory

CH5 - CHEMICAL ENERGETICS

(a) Predict and explain the variation in enthalpy change of hydration for the ions F^−, Cl^−, Br^− and I^−. .....................................

2024 Winter

2

Theory

CH5 - CHEMICAL ENERGETICS

Potassium iodide, KI, is used as a reagent in both inorganic and organic chemistry.(a) KI forms an ionic lattice that is soluble in water.(i) Define e...

2024 Spring

4

Theory

CH5 - CHEMICAL ENERGETICS

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

2024 Summer

3

Theory

CH5 - CHEMICAL ENERGETICS

(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

CH5 - CHEMICAL ENERGETICS

(a) Carbon disulfide, $\text{CS}_2$, is flammable and reacts readily with oxygen, as shown in reaction 1.reaction 1 $\text{CS}_2(g) + 3\text{O}_2(g) \...

2024 Summer

2

Theory

CH5 - CHEMICAL ENERGETICS

(a) Define standard electrode potential, $E^\text{o}$, including a description of standard conditions.(b) (i) An electrochemical cell is set up to mea...

2024 Summer

3

MCQ

CH4 - STATES OF MATTER

The temperature of a sample of an inert gas is increased.What effect does this have on the number of molecules with the most probable energy and on th...

2019 Summer

2

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

A sample of element X is analysed using mass spectrometry. The mass spectrum obtained is shown.What is the relative atomic mass of this sample of elem...

2019 Summer

1

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

A washing powder contains sodium hydrogencarbonate, NaHCO_3, as one of the ingredients.In a titration, a solution containing 1.00 g of this washing po...

2019 Summer

2

MCQ

CH2 - ATOMIC STRUCTURE

The outermost electron in an atom of neon occupies a particular orbital.Which row shows the relative energy and shape of this orbital?[Table_1: Energy...

2019 Summer

1

MCQ

CH3 - CHEMICAL BONDING

In which species is there a lone pair of electrons?

2019 Summer

2

MCQ

CH4 - STATES OF MATTER

When an evacuated tube of volume 400 cm$^3$ is filled with gas at 300 K and 101 kPa, the mass of the tube increases by 0.65 g.Assume the gas behaves a...

2019 Summer

1

MCQ

CH4 - STATES OF MATTER

Under which conditions will nitrogen behave most like an ideal gas?[Table with conditions]

2019 Summer

2

MCQ

CH5 - CHEMICAL ENERGETICS

Two reactions and their enthalpy changes are shown.2C(s) + 2H$_2$(g) \rightarrow C$_2$H$_4$(g) \hspace{1em} \Delta H^\circ = +52.2 \text{ kJ mol}^{-1}...

2019 Summer

3

MCQ

CH6 - ELECTROCHEMISTRY

Ethandioic acid, HO$_2$CCO$_2$H, can be oxidised by KMnO$_4$ in dilute sulfuric acid. The products of this reaction are carbon dioxide, water, potassi...

2019 Summer

2

MCQ

CH7 - EQUILIBRIA

Hydrogen iodide gas decomposes reversibly producing iodine vapour and hydrogen.$$2HI(g) \rightleftharpoons I_2(g) + H_2(g) \quad \Delta H = +12 \text{...

2019 Summer

1