BAHRIA COLLEGE ISLAMABAD GENERAL SCIENCE new lower secondary
BAHRIA COLLEGE ISLAMABAD GENERAL SCIENCE (new lower secondary science II) CLASS VIII MISS IQRA AKRAM
FIRST TERM SYLLABUS Unit No. 1 ATOM AND MOLECULES PG NO 03 Unit No. 2 CHANGES IN MATTER PG NO 06 Unit No. 5 CRYSTALS PG NO 09 Unit No. 10 TRANSPORT IN LIVING ORGANISM PG NO 12 Unit No. 13 LIGHT PG NO 15
MATTER? Any thing that occupy space and has weight is called matter. • All matters are made up of atom. • Atom is fundamental particle of matter. • Atom is abuilding block from which every thing around is made.
Ø QNO 1: what do you know about elements? ELEMENTS: GREEK PHILOSPHER BELIEVED 1. all matter on earth consist of four elements. 2. Scientist have identified 90 naturally occurring elements, and created about 28 others. Pg#2
What is an atom? Greek word atomos The atom is basic unit of matter that consist of dense central nucleus surrounded by cloud of negatively charge electron.
Write down basic characteristics of an atom.
Explain Structure of an Atom.
Write difference between atomic number and mass number.
Explain Representation of an Atoms of an element can be represent by symbol.
Com COMMON ELEMENTS AND SYMBOL : SHORT NAMES GIVEN TO AN ELEMENT. ymbol: short names given to an element.
Define Molecule
For Example
Chemical formula pg#5 A chemical formula is an expression that states the number and type of atoms present in a molecule of a substance. E. g H 2 H= chemical symbol of hydrogen. 2= two atoms present in one molecule.
Pg#6
Review questions pg#7
QNO 4
QNO 5 How does a molecule of an element differ from a molecule of a compound? Molecule of element and compound are two different categories of molecules. The difference between molecule of element and molecule of compound is that the molecule of element contains only one type of atoms whereas the molecule of compound contains two or more types of atom
Qno 6: State the number and types of atoms present in carbon tetrachloride? ccl 4 Ccl 4 In carbon tetrachloride molecule, one atom of caron and four atoms of chlorine are present.
Any question?
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