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1. Each element has a different symbol2. The formula for a compound shows the
elements in the compound 3. It also shows the ratio of the atoms of
different elements in the compound
Chemical FormulaChemical FormulaChemical FormulaChemical Formula
Chemical Formula
The Periodic TableThe Periodic TableThe Periodic TableThe Periodic Table
The Periodic Table
Chemical FormulaChemical FormulaChemical FormulaChemical Formula
Chemical Formula
Atomic StructureAtomic StructureAtomic StructureAtomic Structure
Atomic Structure
Electron shellsElectron shellsElectron shellsElectron shells
Electron shells
Electron shellsElectron shellsElectron shellsElectron shells
Electron shells
1. Word equations use the names of the reactants and products to describe a reaction
Word equationsWord equationsWord equationsWord equations
Word equations
Word equationsWord equationsWord equationsWord equations
Word equations
1. Chemical equations use the chemical formulae of the reactants and products to describe a reaction
2. The total mass of the product(s) of a chemical reaction must equal the total mass of the reactant(s)
3. Therefore chemical equations must be balanced
4. The total number of atoms of one element should be the same on both sides of the equation
Chemical equationsChemical equationsChemical equationsChemical equations
Chemical equations
Balancing equationsBalancing equationsBalancing equationsBalancing equations
Balancing equations
1. Atoms of different elements have different masses
2. The relative atomic mass (Ar) is the mass of the elements compared to the mass of a hydrogen atom
Relative atomic massesRelative atomic massesRelative atomic massesRelative atomic masses
Relative atomic masses
Relative atomic massRelative atomic massRelative atomic massRelative atomic mass
Relative atomic masses
1. The relative formula mass (Mr) is the relative mass of a molecule compared to the mass of a hydrogen atom
Relative Formula MassRelative Formula MassRelative Formula MassRelative Formula Mass
Relative formula mass
Relative formula massRelative formula massRelative formula massRelative formula mass
Relative formula mass
1. The unknown mass of a reactant or product can be worked out by using the known masses of the other reactants and products
Equation calculationsEquation calculationsEquation calculationsEquation calculations
Equation calculations
Calculations from EquationsCalculations from EquationsCalculations from EquationsCalculations from Equations
Calculations from equations
Calculations from EquationsCalculations from EquationsCalculations from EquationsCalculations from Equations
Calculations from equations