Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Copper and titanium are each used with aluminium to make alloys which are light, strong and resistant to corrosion. Aluminium, $Al$, is in the third p...

2009 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

(a) Complete the electronic configuration of aluminium and of titanium, proton number 22.\[\begin{array}{|c|c|} \hline \text{Al} & 1s^2 \\ \hline \tex...

2009 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

You are provided with the following.FA 1 is 0.15 mol dm$^{-3}$ sodium thiosulfate, Na$_2$S$_2$O$_3$.FA 2 is aqueous copper(II) sulfate.You are also pr...

2009 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

You are to investigate how the rate of formation of sulfur varies with the concentration of sodium thiosulfate, Na₂S₂O₃, in the reaction below.N...

2009 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

(a) Carry out the following tests. Record your observations in the spaces provided in the table.[Table_1]To 1 cm depth of solution in a test-tube add ...

2009 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

You are provided with the following.FB 1 is 0.023 mol dm−3 potassium manganate(VII), KMnO4.FB 2 is aqueous ethanedioic acid, H2C2O4, made by dissolv...

2009 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

(a) Reaction of FB 4, Na2CO3, with an excess of 3.0 mol dm^-3 hydrochloric acidRead through the following instructions carefully before starting the e...

2009 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

FB 6 and FB 7 each contain one of the following sodium halides, NaCl, NaBr, NaI. (a) Place half of the solid FB 6 provided in a test-tube. Half fill t...

2009 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Metals play a vital part in biochemical systems. In this question you need to consider why some metals are essential to life, whilst others are toxic....

2009 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

(a) Spider silk is a natural polymer which has an exceptional strength for its weight. *Kevlar* is a man-made polymer designed to have similar propert...

2009 Summer

Theory

CH2 - ATOMIC STRUCTURE

Fig. 1.1 shows how first ionisation energies vary across Period 2.(a) Construct an equation to represent the first ionisation energy of oxygen. Includ...

2022 Spring

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Some oxides of elements in Period 3 are shown.$\text{Na}_2\text{O}$\hspace{1cm}$\text{Al}_2\text{O}_3$\hspace{1cm}$\text{P}_4\text{O}_6$\hspace{1cm}$\...

2022 Spring

Theory

CH11 - GROUP 17

The hydrogen halides HCl, HBr and HI are all colourless gases at room temperature.(a) The hydrogen halides can be formed by reacting the halogens with...

2022 Spring

Theory

CH18 - CARBONYL COMPOUNDS

Compounds J and K are found in plant oils.[Image_1: Illustration of compounds J and K]Fig. 4.1(a) (i) Complete Table 4.1 to state what you would obser...

2022 Spring

Theory

CH7 - EQUILIBRIA

Iodine is found naturally in compounds in many different oxidation states.(a) Iodide ions, $\text{I}^-$, react with acidified $\text{H}_2\text{O}_2$(a...

2022 Spring

Theory

CH5 - CHEMICAL ENERGETICS

Silicon is the second most abundant element by mass in the Earth's crust.(a) In industry, silicon is extracted from SiO$_2$ by reaction with carbon at...

2022 Spring

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

Titanium is a transition element in Period 4. It is commonly found as TiO2 in minerals.(a) (i) Define transition element.................................

2022 Spring

Theory

CH14 - AN INTRODUCTION TO ORGANIC CHEMISTRY

Compounds F and J are shown in Fig. 4.1.Fig. 4.1(a) F and J both contain the arene functional group.(i) Identify...

2022 Spring

Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

2-Chloropropanoic acid, CH₃CHClCOOH, is used in many chemical syntheses.(a) (i) An equilibrium is set up when CH₃CHClCOOH is added to water. Write...

2022 Spring

Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Lidocaine is used as an anaesthetic. A synthesis of lidocaine is shown in Fig. 6.1.(a) W can be formed by reacting HOCH$_2$COOH with an excess of SOCl...

2022 Spring