Chemistry Assignment

contains four sections, SECTION A to SECTION D.
Instructions:


Answer all questions in SECTION A - SECTION D. Make sure that the section heading is included and your answers are correctly numbered.



The assignment must have a completed cover sheet. It must be placed in the drop-box on or before the deadline.



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SECTION A
ELECTRONIC STRUCTURE & IONIZATION ENERGY
1.

2.

Write the electronic structure in s,p,d notation of the following:
O, Na, Na+, Al, Cl- and Co

(Total 6 Marks)

Write the electronic configuration in box notation of the following: N, Si and Ni
(Total 3 Marks)

3.

Write the electronic configuration in box notation of chromium and copper. Suggest reasons for the apparently anomalous arrangement of electrons in their atoms.
(Total 4 Marks)

4.

The following table shows the first three ionization energies (in kJ mol-1) of elements in the SAME group of the Periodic Table.
Element
A
B
C
D
E
(a)
(b)

Hi1
383
409
425
502
527

Hi2
2437
2667
3065
4568
7314

Hi3
3376
3881
4438
6929
11820

In which group of the Periodic Table should the elements be placed?
Give a reason for your answer.
Which of the elements has the largest atomic number?
Give a reason for your answer.

Turn to Page 2 for SECTION A - Question 5.
1

(2 Marks)
(2 Marks)
(Total 4 Marks)

5.

The following table shows the first four ionization energies of the elements A to E in kJ mol-1.
Element
A
B
C
D
E
(a)
(b)

Hi1
800
740
900
418
577

Hi2
2400
1500
1757
3069
1816

Hi3
3700
7700
14850
4439
2745

Hi4
25000
10500
21000
5876
11575

In which group of the Periodic Table should each element be placed?
(5 Marks)
How much energy is needed to convert one mole of gaseous atoms of element
(2 Marks)
C into 1 mole of dipositive ions?
(Total 7 Marks)

MOLARITY CALCULATIONS
6.

Calculate number of moles of:
(a) HCl in 25 cm3 of 0.10 mol dm-3 solution