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A-level Chemistry Model Answers > Group 3 Model answers > Flashcards

Group 3 Model answers Flashcards

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1
Q

Sodium and water

A

Reacts vigorously
Resulting solution high pH value 13-14
sodium floats on surface of water
fizzing, gives off hydrogen gas

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2
Q

Magnesium and water

A

Reacts very slowly at room temperature
Gives off few bubbles of H2 gas
Resulting solution pH of around 10 because magnesium hydroxide only sparingly soluble
slight white precipitate

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3
Q

What is oxidation state of period 3 elements in their oxides?

A

+3

Apart from sulfur which forms two

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4
Q

phosphorus pentoxide

A

P4O10

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5
Q

What type of structure is SiO2?

A

Giant covalent lattice

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6
Q

Sulfur flame colour

A

Blue

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7
Q

Magnesium flame colour

A

White

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8
Q

Sodium flame colour

A

Yellow

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9
Q

What does sulfur react with oxygen to make?

A

SO2

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10
Q

How is SO3 made?

A

SO2 is oxidised

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11
Q

Alkaline solutions of period 3 oxides

A

MgO and Na2O forming hydroxides

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12
Q

Neutral solutions of period 3 oxides

A

Al2O3 (amphoteric) and SiO2 (doesn’t dissolve but reacts as acidic oxide)

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13
Q

Why does Al2O3 not dissolve?

A

covalent character

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14
Q

Acidic solutions of period 3 oxides?

A

SO2 SO3 and P4O10

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15
Q

pH of phosphoric acid

A

0-1

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16
Q

pH of sulphurous acid

A

3-4

17
Q

what forms sulphurous acid and what forms sulfuric acid?

A

SO2 -> sulfurous

SO3 -> sulfuric

18
Q

What does sulfurous acid dissociate to?

A

partially to H+ and HSO3-

19
Q

Acidic period 3 oxides

A

SiO2 P4O10 SO2 SO3

20
Q

Aluminium oxide reacting as acid

A

Al2O3 + NaOH + 3H2O -> NaAl(OH)4

21
Q

Silicon oxide reacting with NaOH

A

SiO2 + hot concentrated 2NaOH -> NaSiO3 +H2O

22
Q

Phosphorus pentoxide reacting with Na2O

A

P4O10 + 6Na2O -> 4Na3PO4

23
Q

SO2 reacting with NaOH step 1 step 2

A

NaOH + SO2 -> NaHSO3

NaHSO3 + NaOH -> Na2SO3 + H2O

24
Q

NaOH reacting with SO3 step 1 step 2

A

NaOH + SO3 -> NaHSO4

NaHSO4 + NaOH -> Na2SO4 + H2O

A-level Chemistry Model Answers (14 decks)

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