Examination Paper 1 (50 marks)

50 objective questions Paper 2 (100 marks)

Section A, structure – 6 Questions (60 Marks) Section B, essay – 2 Questions, Choose only 1 question (20 Marks) Section C, essay– 2 Questions, Choose only 1 question (20 Marks)

Paper 3 (50 Marks)- Experiment Question 1 – 33 marks (Structure) Question 2 – 17 marks (Report Experiment)

Experiment 1 To determine the Melting and Freezing point of

Naphthalene/Acetamide.

Draw the procedure for this experiment in your exercise book and bring it on:

Date: Friday (11/1/13)Time: 2.45p.m.

Venue: Chemistry LabWear shoes and proper school uniform

Don’t bring any food, drink and school bag in the lab.

ReportSubmit: Monday

Name Class Aim

Problem statement Hypothesis

Variables (manipulated, responding, fixed) Apparatus Materials Procedure

Result (In table & plot graph) Inference

Calculation if necessary Discussion (Questions will be given)

Conclusion

THE STRUCTURE OF THE ATOM

Chapter 2

In this chapter, you will learn to:

Analyse matter

Synthesise the atomic structureUnderstanding isotopes and their uses

Understanding the electronic structure of an atomAppreciate the orderliness and uniqueness of the atomic

structure.

Assignment

Development of Atomic Models

Group 1: John Dalton’s Model – 4 members

Group 2: J.J. Thomson’s Model - 3 members

Group 3: Ernest Rutherford’s Model– 4 members

Group 4: Neils Bohr’s Model - 4 members

Group 5: James Chadwick’s Model– 4 members

Symbol of ElementsElements Symbol Hydrogen

Lithium

Sodium

Potassium

Beryllium

Magnesium

Calcium

Boron

Aluminium

Carbon

Continue…Elements Symbol

SiliconNitrogen

PhosphorusOxygenSulphurFluorineChlorineHelium Neon Argon

2.2 Atomic StructureAn atom contains three types of subatomic particles:

The protons and neutrons are found in the nucleus, while the electrons move around the nucleus in fixed orbits.

The nucleus is positively charged because of the presence of protons, which are positively charged. The neutrons are neutral.

Particles Symbol Relative charge

Relative mass

Proton p +1 1

Neutron n 0 1

Electron e -1 1/1840

Continue…A neutral atom contains the same number of electrons as the

protons.Example:

An Aluminium atom contains 13 protons and 13 electrons.The number of protons in the nucleus of an atom is called its

proton number (atomic number).The total number of protons and neutrons in the nucleus is

the nucleon number (mass number).

Nucleon Number = Number of Proton + Number of Neutron

Exercises

1. An element P has a nucleon number of 31 and a proton number of 15. Find the number of protons, electrons and neutrons in the atom.

The atom of an element is written with its symbol, nucleon number and proton numbers as follows:

Example:

This means that a calcium atom has 20 protons and (40 – 20 ) = 20 Neutrons.

Yab

Symbol Proton number

Nucleon number

Ca4020