Chemistry 9701/42 — May/June 2015

Cambridge A-Level · A Level Structured Questions · worked solutions for every part, with the mark scheme

questions

100

marks

120

minutes

Topics Nitrogen Compounds · Group 2 · Equilibria · Electrochemistry · Hydrocarbons · Introduction to A Level Organic Chemistry · +6 more

Q1Transition ElementsFree sample

(a)

Complete the electronic configurations of the following atoms.

fluorine: $1\text{s}^2$ ..........................................

sulfur: $1\text{s}^2$ ..........................................

(b)

(i)

Write an equation to show the thermal decomposition of $\text{HCl}$ .

(ii)

Using all relevant bond energy values from the Data Booklet, explain why the thermal stability of $\text{HF}$ is much more than that of $\text{HCl}$ .

(c)

Explain what is meant by the term electronegativity, and how it relates to the concept of bond polarity.

(d)

Sulfur and fluorine react together to give the covalent compound $\text{SF}_4$ .

(i)

Draw a ‘dot-and-cross’ diagram to show the bonding in $\text{SF}_4$ . Include all outer shell electrons in your diagram.

(ii)

State whether a molecule of $\text{SF}_4$ has a dipole moment. Explain your answer.

(e)

Suggest a reason why sulfur can form both $\text{SF}_4$ and $\text{SF}_6$ whereas oxygen can only form $\text{OF}_2$ .

(f)

(i)

State a major source of atmospheric sulfur dioxide.

(ii)

State one environmental consequence of atmospheric sulfur dioxide.

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8 more questions

Q2Group 28M
Q3Group 2 · Equilibria · Electrochemistry12M
Q4Equilibria · Electrochemistry12M
Q5Hydrocarbons · Introduction to A Level Organic Chemistry · Nitrogen Compounds · Hydroxy Compounds14M
Q6Carboxylic Acids and Derivatives · Nitrogen Compounds · Hydroxy Compounds · Organic Synthesis · Introduction to A Level Organic Chemistry13M
Q7Nitrogen Compounds8M
Q8Analytical Techniques · Hydrocarbons12M
Q9Polymerisation10M

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