Science - Teachers Sri Lanka

Competency
1.0( Investigates the Scientific findings about the
structure of matter and quantity.
Copyright © 2007 National Institute of Education - Sri Lanka. All rights reserved.
Competency level 1.4 Use mole to quantify elements and Compounds.
Activity 1.4 ( Let us quantify matter.
Time ( 120 minutes
Quality inputs ( ² An enlarged copy of data table given in annexe 1.4.1
² Two copies of instructions for exploration given in
annexe 1.4.2
² Demy papers and pastels
Teaching-learning process (
Step 1.4.1 ( ² Asks from the students that if the mass of a two rupee coin is
8g what is the easiest way to seperate ten thousand of those
coins.
² Exhibit the data table to the class.
² Direct students to get together in group of two and calcu
late the number of atoms in a relative mass of an atom,in
grammes,or the number of molecule in grammes.
² Lead a discussion highlighting the following facts.
² The number of atoms in a relative atomic mass of an
element in grammes has been calculated to be about
6.022x10 23
² The number of molecules in a relative molecular mass
of a compound in grammes has to be calculated to be
about 6.022x10 23
² The number of atoms in a relative atomic mass of an
element in grammes or the number of the molecules
in a relative molecular mass of a compound in grammes
is 6.022x10 23
² A mole of a substance is 6.022x10 23 fundamental enti
ties of that substance
6.022x10 23f fundamental units which make up matter,the
atom,molecule,ion,subatomic particles is called a mole
of that matter.
² Mole is an international unit which measure the quantity
of matters.