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 Lab Wear shoes and proper school uniform Don’t bring any food, drink and school bag in the lab.
Report Submit: 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
In this chapter, you will learn to: Analyse matter Synthesise the atomic structure Understanding isotopes and their uses Understanding the electronic structure of an atomAppreciate the orderliness and uniqueness of the atomic structure.
AssignmentDevelopment 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 SymbolHydrogen Lithium SodiumPotassiumBerylliumMagnesium Calcium BoronAluminium Carbon
2.2 Atomic StructureAn atom contains three types of subatomic particles: Particles Symbol Relative Relative mass charge Proton p +1 1 Neutron n 0 1 Electron e -1 1/1840The 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.
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
Exercises1. 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: Nucleon number a Proton numberExample: b Y Symbol 40 20 Ca This means that a calcium atom has 20 protons and (40 – 20 ) = 20 Neutrons.