Unit 4: The Chemists tools
Objectives
Students should..
  have an insight into the size of atomic systems.
  Understand the law of constant composition and how it relates to
chemical formulae
  Understand the law of conservation of matter and how it relates
to chemical equations
  understand the relationship between moles and mass
  be able to calculate reacting masses in equations by ratio and
by the use of moles.
  be able to calculate the formula of a simple binary substance through
experiment
  understand the experimental concepts of reliability, precision and
accuracy
Content
Preunit revision
 Atoms and molecules revision
to include relative molecular mass
 Formulae and valency revision  the
law of constant composition
 Law of conservation of mass
 Chemical equations.
 Construction and balancing equations
The mole concept
Introduction to moles and reacting
masses
Moles calculations
Cwk, Hwk calculations
on moles, RMM, and reacting masses
Expt 1: Determining the formula of magnesium oxide
Expt 2: Determining the equation
for the decomposition of magnesium carbonate
Expt 3: Reduction of copper(II) oxide
Planning: Determing the water of crystallisation in hydrated copper(II)
sulphate
Virtual experiment: The reduction
of metal oxides  data processing
Unit test: Formulae, equations, moles and mass
Resources
Formulation selftest
Formula recognition
Worksheets
Formulation 1
Formulation 2
Balancing equations 1
Valency table
