Theory

CH6 - ELECTROCHEMISTRY

Bismuth is an element in Group 15 of the Periodic Table.(a) Bismuth has metallic bonding.Draw a labelled diagram to show the metallic bonding in bismu...

2024 Spring

4

Theory

CH6 - ELECTROCHEMISTRY

(a) A and B react together to give product AB.A + B → ABWhen the concentrations of A and B are both 0.0100 mol dm−3, the rate of formation of AB i...

2024 Winter

3

Theory

CH6 - ELECTROCHEMISTRY

(a) Explain why transition elements form complex ions. .................................................................................................

2024 Winter

3

Theory

CH6 - ELECTROCHEMISTRY

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

CH6 - ELECTROCHEMISTRY

(a) (i) Lithium nitrate, LiNO₃, decomposes on heating in a similar way to Group 2 nitrates to give the metal oxide, a brown gas and oxygen.Write an ...

2024 Summer

3

Theory

CH6 - ELECTROCHEMISTRY

(a) (i) Define transition element........................................................................................................................

2024 Summer

5

Theory

CH6 - ELECTROCHEMISTRY

(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

CH6 - ELECTROCHEMISTRY

(a) When a sample of hydrated lithium ethanedioate, $\text{Li}_2\text{C}_2\text{O}_4 \cdot \text{H}_2\text{O}$, is gently heated, two gaseous products...

2024 Summer

2

Theory

CH6 - ELECTROCHEMISTRY

(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

CH6 - ELECTROCHEMISTRY

(a) The equation for reaction 1 is shown.reaction 1\qquad X \rightarrow 2YReaction 1 is first order with respect to the concentration of X. The half-l...

2024 Winter

2

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

1

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

4

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

3

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

2

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

1

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

2

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

3

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

2

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

2

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

2