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

Theory

CH3 - CHEMICAL BONDING

The Pauling electronegativity values of elements can be used to predict the chemical properties of compounds.Use the information in Table 1.1 to answe...

2023 Spring

2

Theory

CH10 - GROUP 2

The Group 2 elements Mg to Ba are all silvery-white reactive metals.(a) (i) Draw a labelled diagram to show the bonding and structure of the Group 2 m...

2023 Spring

2

Theory

CH15 - HYDROCARBONS

(a) (i) Define addition reaction.........................................................................................................................

2023 Spring

2

Theory

CH16 - HALOGEN DERIVATIVES

(a) (i) State the reagent and conditions used to form E in reaction 1....................................................................................

2023 Spring

2

Theory

CH2 - ATOMIC STRUCTURE

(a) The most common zinc mineral contains zinc(II) sulfide, ZnS.(i) Complete the electrons in boxes diagram in Fig. 1.1 to show the electronic configu...

2023 Spring

3

Theory

CH6 - ELECTROCHEMISTRY

Hypophosphorous acid is an inorganic acid.The conjugate base of hypophosphorous acid is $\text{H}_2\text{PO}_2^-$.(a) Give the formula of hypophosphor...

2023 Spring

1

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

Vanadium is a transition element in Period 4 of the Periodic Table.(a) Define transition element.........................................................

2023 Spring

2

Theory

CH20 - NITROGEN COMPOUNDS

Ethylamine and phenylamine are primary amines.Fig. 4.1These two compounds are synthesised by different methods.(a) Several methods can be used to form...

2023 Spring

3

Theory

CH14 - AN INTRODUCTION TO ORGANIC CHEMISTRY

(a) Tulobuterol contains a benzene ring in its structure.Describe and explain the shape of benzene.In your answer, include:• the bond angle between ...

2023 Spring

2

Theory

CH22 - ANALYTICAL TECHNIQUES

(a) (i) Suggest a compound that could be used as the stationary phase in this experiment.................................................................

2023 Spring

1