Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

(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

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

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

2024 Winter

3

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

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

2024 Summer

5

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

The shapes of four different complexes, P, Q, R and S, are shown in Table 5.1. The symbol J represents an atom or ion of a transition element. The sym...

2024 Winter

2

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

(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

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

(a) (i) Explain why transition elements have variable oxidation states...................................................................................

2024 Summer

3

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

Iron is a transition metal in Group 8 of the Periodic Table.(a) (i) Explain why iron has variable oxidation states.......................................

2024 Spring

3

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

(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

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

Ruthenium and osmium are transition metals below iron in Group 8 of the Periodic Table.(a) Two different complex ions, $X$ and $Y$, can form when anhy...

2024 Spring

2

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

(a) When NaOH(aq) is added to an aqueous solution containing [Co(H2O)6]2+ a precipitation reaction occurs accompanied by a colour change.In this react...

2024 Winter

4

Theory

CH2 - ATOMIC STRUCTURE

(a) Complete the table to show the composition and identity of some atoms and ions.[Table]name of element | nucleon number | atomic number | number of...

2016 Summer

1

Theory

CH4 - STATES OF MATTER

D, E, F, and G are four consecutive elements in the fourth period of the Periodic Table. (The letters are not the actual symbols of the elements.)D is...

2016 Summer

1

Theory

CH10 - GROUP 2

The elements in Group 2, and their compounds, show many similarities and trends in their properties.(a) Magnesium, calcium, strontium and barium all r...

2016 Summer

1

Theory

CH14 - AN INTRODUCTION TO ORGANIC CHEMISTRY

This question is about molecules with molecular formula $C_4H_8$.(a) Give the structures of a pair of **positional** isomers with the formula $C_4H_8$...

2016 Summer

1

Theory

CH22 - ANALYTICAL TECHNIQUES

(a) Complete the diagram to show the mechanism of reaction 1. Include all necessary charges, partial charges, lone pairs and curly arrows.H3C—C—Br...

2016 Summer

Theory

CH2 - ATOMIC STRUCTURE

(a) Complete the table to show the composition and identity of some atoms and ions.[Table_1]name of element | nucleon number | atomic number | number ...

2016 Summer

2

Theory

CH5 - CHEMICAL ENERGETICS

The elements in Group 17, the halogens, and their compounds, show many similarities and trends in their properties. Some data are given for the elemen...

2016 Summer

3

Theory

CH6 - ELECTROCHEMISTRY

Acidified potassium dichromate(VI) can oxidise ethanedioic acid, $H_2C_2O_4$. The relevant half-equations are shown. $$Cr_2O_7^{2-} + 14H^+ + 6e^- \r...

2016 Summer

2

Theory

CH22 - ANALYTICAL TECHNIQUES

This question is about molecules with molecular formula $C_4H_8O_2$.(a) Give the structural formulae of the pair of extbf{chain} isomers with the for...

2016 Summer

2

Theory

CH17 - HYDROXY COMPOUNDS

A reaction sequence based on propan-1-ol is shown. (a) Reactions 1 and 2 can both be carried out using the same reagents. (i) Identify suitable rea...

2016 Summer

2