1
Q
1.3 Determination of the formula for magnesium oxide
Why did you need to raise the crucible lid slightly when you first heated the magnesium?
A
To let oxygen enter so it could react with the magnesium
2
Q
The formula from this experiment often shows slightly less oxygen than is present in pure magnesium
oxide. Suggest why this should be so.
A
3
Q
What was the purpose of breaking up the magnesium oxide whilst heating the contents of the crucible
strongly for 5 minutes?
A
OCR A-LEVEL CHEM A
flashcards
Decks in class (43)
# Cards
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2.1 atomic structure13
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2.2 relative mass13
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2.3 formulae and equations19
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3.1 amount of substance and the mole7
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3.2 determination of formulae7
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3.3 moles and volumes21
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PAG 13
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3.4 reacting Quantities8
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4.1 acids bases and nutralisation17
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4.2 acid-base titrations12
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4.3 oxidation and redox13
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5.1 electron structure18
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5.2 Ionic bonding15
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5.3 covalent bonding8
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5. metallic bonding7
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6.1 shapes of molecules and ions10
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5. giant covalent and metallic5
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6.2 electronegativity and polarity11
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6.3 intermolecular forces9
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6.4 Hydrogen bonding7
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7.1 & 7.2 the periodic table and Ionisation energies21
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8.1 Group 211
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8.2 Halogens15
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8.3 Quantitative analysis5
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9.1 enthalpy19
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9.2 enthalpy changes14
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9.3 bond enthalpies5
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11. basic organic concepts57
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ch 12 alkanes17
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12 alkenes38
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15 haloalkanes25
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ch 14 alcohols33
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ch 16 organic synthesis15
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23. 1 Redox reactions13
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23.2 manganese (VII) redox titrations20
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23.3 iodine/thiosulfate redox titrations11
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27 Amines, amino acids , polymers0
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Ch 18 rates17
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ch 19 equilibrium constants8
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ch 20 acids and bases16
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ch 24 transition metals34
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inorganic- Definitions173
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organic definitions175
