Q1. The electronic structure of the atoms of five elements are shown in the figure below.
The letters are not the symbols of the elements.
 
Choose the element to answer the question. Each element can be used once, more than once or not at all.
Use the periodic table to help you.
(a)     Which element is hydrogen?
Tick one box.
 
A		 	B		 	C		 	D		 	E		
(1)
(b)     Which element is a halogen?
Tick one box.
 
A		 	B		 	C		 	D		 	E		
(1)
(c)     Which element is a metal in the same group of the periodic table as element A?
Tick one box.
A		 	B		 	C		 	D		 	E		
(1)
(d)     Which element exists as single atoms?
Tick one box.
 
A		 	B		 	C		 	D		 	E		
(1)
(e)     There are two isotopes of element A. Information about the two isotopes is shown in the table below.
 
Mass number of the isotope	6	7   	
Percentage abundance	92.5	7.5	
Use the information in the table above above to calculate the relative atomic mass of element A.
Give your answer to 2 decimal places.
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Relative atomic mass = _______________________
(4)
Q2. This question is about the halogens (Group 7).
(a)     How do the boiling points of the halogens change down the group from fluorine to iodine?
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(1)
(b)     Sodium bromide is produced by reacting sodium with bromine.
Sodium bromide is an ionic compound.
(i)      Write down the symbols of the two ions in sodium bromide.
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(1)
(ii)     Chlorine reacts with sodium bromide solution to produce bromine and one other product.
Complete the word equation for the reaction.
chlorine   +   sodium bromide      bromine   +   ______________
(1)
(iii)    Why does chlorine displace bromine from sodium bromide?
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(1)
(iv)    Use the Chemistry Data Sheet to help you to answer this question.
Suggest which halogen could react with sodium chloride solution to produce chlorine.
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(1)
Q3. (a)     The symbols for seven different elements are shown in Figure 1.
 
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	He	
 	Be	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
Na	 	 	 	 	 	 	 	 	 	 	 	 	 	 	S	 	Ar	
 	Ca	 	 	 	 	 	Fe	 	 	 	 	 	 	 	 	 	 	

 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
Choose the correct symbol from Figure 1 to answer each question.
You may use each symbol once, more than once or not at all.
Write the symbol that represents:
(i)      a Group 1 element
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(1)
(ii)     a transition metal
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(1)
(iii)    an element with electrons in the same number of energy levels as an atom of argon (Ar)
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(1)

 (b)     A teacher put a cube of sodium metal into water containing universal indicator, as shown in Figure 2.
Figure 2
 
The equation for the reaction is:
 
2Na(s)	+	2H2O(l)		2NaOH (aq)	+	H2(g)	
sodium	+	water		sodium
hydroxide	+	hydrogen	
(i)      The sodium floated on the surface of the water. The universal indicator turned purple.
Give three other observations that would be seen during the reaction.
1. ____________________________________________________________
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2. ____________________________________________________________
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3. ____________________________________________________________
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(3)
(ii)     Name the ion that made the universal indicator turn purple.
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(1)

(c)     Figure 3 represents the electronic structure of a sodium atom.
Figure 3
 
In the space below, draw the electronic structure of a sodium ion. Include the charge on the ion.

 
 
(2)
(Total 11 marks)
Q4. This question is about Group 7 elements.
Chlorine is more reactive than iodine.
(a)  Name the products formed when chlorine solution reacts with potassium iodide solution.
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(1)
(b)  Explain why chlorine is more reactive than iodine.
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(3)
 (Total 26 marks)

Mark schemes
Q1.
(a)     B
1
(b)     D
1
(c)     E
1
(d)     C
1
(e)     92.5 × 6 and
7× 7.5
1
 
1
6.075
1
6.08
1
allow 6.08 with no working shown for 4 marks
[8]
Q2.
(a)     increase
1
(b)     (i)      Na+ and Br−
both required
1
(ii)     sodium chloride
allow NaCl
do not allow sodium chlorine
1
(iii)    chlorine is more reactive than bromine
allow converse argument
allow symbols Cl, Cl2, Br and Br2
allow chlorine / it is more reactive
do not allow chloride or bromide
1
(iv)    fluorine
allow F / F2.
do not allow fluoride.
1
[5]
Q3.
(a)     (i)      Na
allow sodium / phonetic spelling
if more than one answer is given apply list principle
1
(ii)     Fe
allow iron / phonetic spelling
if more than one answer is given apply list principle
1
(iii)    Na or S
allow sodium or sulfur / sulphur / phonetic spelling
if more than one answer is given apply list principle
1
 (b)     (i)      any three from:
•        effervescence / fizzing or bubbles or gas produced
do not allow incorrectly named gas
•        sodium melts or turns into a ball
•        sodium moves (on the surface)
•        steam / mist / vapour is produced
ignore heat / temperature / flame / spark
•        sodium gets smaller / disappears
allow dissolves
•        colour of indicator is darker / more intense near the sodium
Must be linked to near the sodium.
3
(ii)     hydroxide or OH–
allow OH without a charge
do not allow OH+
1
(c)     
 
diagram showing electron configuration of ion is 2,8
1
charge on ion is +
Bracket not necessary
[2,8]+ is worth 1 mark as there is no diagram
1
[11]
Q4.
(a)  potassium chloride and iodine
either order
allow KCl for potassium chloride and I2 for iodine
1
(b)  (chlorine’s) outer electrons / shell closer to the nucleus
allow chlorine has fewer shells
allow chlorine atom is smaller than iodine atom
ignore chlorine has fewer outer shells
1
(so) the chlorine nucleus has greater attraction for outer electrons / shell
allow chlorine has less shielding
do not accept incorrect types of attraction
1
(so) chlorine gains an electron more easily
1
max 2 marks can be awarded if the answer refers to chloride / iodide instead of chlorine / iodine
allow converse statements
allow energy levels for shells throughout