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, Exam Guidelines: Chemical ChangeCHEMICAL CHANGE is examined in Paper 2 (3 hr)
EXAM WEIGHTING
92 marks out of 150
• – i.e. 61% of the paper.
Revision of Grade 10 work (Chemical Change part 1)
• Representing chemical change – balancing chemical equation
conservation of atoms and mass
Quantitative Aspects (Chemical Change part 2)
• The mole, molar volume of gases, volume relationships in ga
reactions, concentration of solutions, more complex
stoichiometric calculations
Energy and Chemical Change (Chemical Change part 3)
• Energy changes in reactions, exothermic and
endothermic reactions, activation energy
Types of Reaction(Chemical Change part 4)
• Acid-base reactions, redox reactions, oxidation
numbers
, TOPIC OUTLINE: REPRESENTATION CHEMICAL CHANGE GR 10
Define a physical change and give examples.
Define a chemical change and give examples.
Write word equations from chemical equations and vice versa
Use (s), (aq), (l) and (g) to indicate phases.
Write balanced chemical equations
Conservation of atoms and mass
Law of constant composition.
Interpret balanced equations in terms of conservation of atoms
and mass.
5
, TOPIC OUTLINE :MOLE CONCEPT AND MOLE
RELATIONSHIPS
Describe the mole as the SI unit for amount of substance.
Define one mole as the amount of substance having the same number of
particles as there are atoms in 12 g carbon-12.
Describe Avogadro's number, NA, as the number of particles (atoms,
molecules, formula-units) present in one mole (NA = 6,023 x 1023 particles∙mo
Calculate number of moles using
:
𝑛=
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