Trends in period 3

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What is the trend in melting points of period 3 oxides? *
MgO>Al2O3>SiO2>Na2O>P4O10>SO3>SO2
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What is the pH of NaOH compared to Mg(OH)2?
NaOH = 14, Mg(OH)2 = 9 (magnesium oxide is sparingly soluble).
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Why is NaOH(aq) strongly alkaline?
It contains the oxide ion (O2-) which is a very strong base and so readily accepts H+ from water to produce hydroxide ions.
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Why is Al2O3 insoluble? *
Its bonding has covalent character, so is too strong for the ions to be separated.
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Why is SiO2 insoluble?
It has a macromolecular structure, with strong covalent bonds between all atoms.
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What is produced when a period 3 oxide reacts with an acid/base?
A salt + water
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Other cards in this set

Card 2

Front

What is the pH of NaOH compared to Mg(OH)2?

Back

NaOH = 14, Mg(OH)2 = 9 (magnesium oxide is sparingly soluble).

Card 3

Front

Why is NaOH(aq) strongly alkaline?

Back

Preview of the front of card 3

Card 4

Front

Why is Al2O3 insoluble? *

Back

Preview of the front of card 4

Card 5

Front

Why is SiO2 insoluble?

Back

Preview of the front of card 5
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