Paper 3 H - SAMPLE SET 1 Q5
5) In 1869 there were 60 known elements.
Mendeleev arranged the elements in order of their atomic mass (atomic weight).
He realised that elements with similar properties occurred at regular intervals.
5.1) Suggest why one of the groups that is on today’s periodic table was not in Mendeleev’s periodic system. [1 mark]
5.2)Explain the arrangement of the first 20 elements in today’s periodic table.
You should answer in terms of atomic structure. [2 marks]
A student put some potassium bromide solution in a test tube.
She added a few drops of chlorine solution and observed the result.
She repeated the process using different potassium halide salts and different halogens.
Table 2 shows the student’s results.
Mendeleev arranged the elements in order of their atomic mass (atomic weight).
He realised that elements with similar properties occurred at regular intervals.
5.1) Suggest why one of the groups that is on today’s periodic table was not in Mendeleev’s periodic system. [1 mark]
5.2)Explain the arrangement of the first 20 elements in today’s periodic table.
You should answer in terms of atomic structure. [2 marks]
A student put some potassium bromide solution in a test tube.
She added a few drops of chlorine solution and observed the result.
She repeated the process using different potassium halide salts and different halogens.
Table 2 shows the student’s results.
5.3) Give the order of reactivity of the halogens from the results in Table 2.
Explain how you used the results to show this order of reactivity. [2 marks]
Order __________________________________________
Explanation ______________________________________
5.4) Write a balanced ionic equation for the reaction of chlorine with bromide ions in solution. [3 marks]
5.5) Explain the order of reactivity of Group 7 elements.
Include information about atomic structure. [2 marks]
(Total for Question 5 = 10 marks)
Explain how you used the results to show this order of reactivity. [2 marks]
Order __________________________________________
Explanation ______________________________________
5.4) Write a balanced ionic equation for the reaction of chlorine with bromide ions in solution. [3 marks]
5.5) Explain the order of reactivity of Group 7 elements.
Include information about atomic structure. [2 marks]
(Total for Question 5 = 10 marks)