Theory

CH8 - REACTION KINETICS

(a) The reaction between iodide ions and persulfate ions, $S_2O_8^{2-}$, is slow.$$2I^- + S_2O_8^{2-} \longrightarrow I_2 + 2SO_4^{2-} \quad 1$$The re...

2009 Summer

MCQ

CH8 - REACTION KINETICS

Four reactions of the type shown are studied at the same temperature.$X(g) + Y(g) \rightarrow Z(g)$Which is the correct reaction pathway diagram for t...

2009 Winter

Theory

CH8 - REACTION KINETICS

(a) Explain, using diagrams where appropriate, the types of interaction responsible for the primary, secondary and tertiary structure of a protein.pri...

2009 Winter

MCQ

CH8 - REACTION KINETICS

Na_2S_2O_3 reacts with dilute HCl to give a pale yellow precipitate. If 1 cm^3 of 0.1 mol dm^{-3} HCl is added to 10 cm^3 of 0.02 mol dm^{-3} Na_2S_2O...

2010 Summer

MCQ

CH8 - REACTION KINETICS

Na₂S₂O₃ reacts with dilute HCl to give a pale yellow precipitate. If 1 cm³ of 0.1 mol dm⁻³ HCl is added to 10 cm³ of 0.02 mol dm⁻³ Na₂...

2010 Summer

Theory

CH8 - REACTION KINETICS

The diagram below shows, for a given temperature T, a Boltzmann distribution of the kinetic energy of the molecules of a mixture of two gases that wil...

2010 Summer

Theory

CH8 - REACTION KINETICS

Phenacyl chloride has been used as a component of some tear gases. Its lachrymatory and irritant properties are due to it reacting with water inside b...

2010 Summer

Theory

CH8 - REACTION KINETICS

Phenacyl chloride has been used as a component of some tear gases. Its lachrymatory and irritant properties are due to it reacting with water inside b...

2010 Summer

MCQ

CH8 - REACTION KINETICS

The diagram represents the Boltzmann distribution of molecular energies at a given temperature. Which of the factors that affect the rate of a reactio...

2010 Winter

MCQ

CH8 - REACTION KINETICS

The diagram represents the Boltzmann distribution of molecular energies at a given temperature. Which of the factors that affect the rate of a reac...

2010 Winter

Theory

CH4 - STATES OF MATTER

The rate of chemical reactions is affected by changes in temperature and pressure.(a) (i) Draw a curve on the axes to show the Boltzmann distribution ...

2021 Spring

Theory

CH11 - GROUP 17

Chlorine, $Cl_2$, is a reactive yellow-green gas. It is a strong oxidising agent.(a) State how $Cl_2$ is used in water purification......................

2021 Spring

Theory

CH5 - CHEMICAL ENERGETICS

Compounds P, Q and R have all been found in the atmosphere of one of Saturn’s moons. P: N≡C—C≡C—C≡C—N Q: H—C≡C—C≡N R: ![Cyclopr...

2021 Spring

Theory

CH3 - CHEMICAL BONDING

Hydroxyethanal, HOCH$_2$CHO, has been observed in dust clouds near the centre of our galaxy.hydroxyethanal(a) Predict the bond angles labelled x and y...

2021 Spring

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

(a) The most common oxidation states of cobalt are +2 and +3.Complete the electronic configurations of the following free ions.• Co2+ [Ar] .........

2021 Spring

Theory

CH6 - ELECTROCHEMISTRY

(a) Iron(II) compounds are generally only stable in neutral, non-oxidising conditions.It is difficult to determine the lattice energy of FeO experimen...

2021 Spring

Theory

CH3 - CHEMICAL BONDING

Iodates are compounds that contain the $\text{IO}_3^{-}$ anion.(a) The $\text{IO}_3^{-}$ anion is shown.Explain, with reference to the qualitative mod...

2021 Spring

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

The transition elements are able to form stable complexes with a wide range of molecules and ions.(a) State the meaning of transition element............

2021 Spring

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

(a) Carboplatin and satraplatin are used as anticancer drugs instead of cisplatin. (i) Describe the action of cisplatin as an anticancer drug. ........

2021 Spring

Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Fumaric acid is a naturally occurring dicarboxylic acid.\\[ \text{fumuric acid} \] \[ \text{HO}_2\text{C}=\text{CH}-\text{CH}=\text{CO}_2\text{H} \](a...

2021 Spring