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CHEMISTRY > PERIOD 3 > Flashcards

PERIOD 3 Flashcards

1
Q

Why does SO3 have a higher melting point than SO2

A

•bigger molecule
•stinger van der waals between molecules

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2
Q

SO2 reacts with water to form ions
What are the ions?

A

H+
HSO3-

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3
Q

Why does SO2 form a weakly acidic solution?

A

Reaction is in equilibrium

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4
Q

Why is SiO2 described as acidic even though it is soluble in water

A

Reacts with bases

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5
Q

Why is white phorosphorus kept under water

A

To prevent it from reacting with oxygen

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6
Q

Why is P4O10 not presented as P2O5

A

P4O10 is it’s molecular formula

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7
Q

Why can magnesium oxide be used in excess when used for a neutralisation of phosphoric acid

A

Insoluble

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8
Q

Why can an excess of NaOH be dangerous

A

Can turn water alkaline

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9
Q

Two products of Cl and H2O

A

HClO
HCl

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10
Q

Flame colour for Na and oxygen

A

Orange

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11
Q

Flame colour for Mg and oxygen

A

White flame

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12
Q

Flame colour for aluminium and oxygen

A

White flame

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13
Q

Flame colour for Si and oxygen

A

Orange flame

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14
Q

Flame colour for white phosphorus and oxygen

A

White flame

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15
Q

Reaction of Al and O2

A

4Al + 3O2 —> 2Al2O3

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16
Q

Flame colour for sulphur and oxygen

A

Pale blue flame

17
Q

Which oxides form a white ppt

A

Na2O
Na2O2
Al2O3
SiO2

18
Q

What is the trend in bonding across period 3

A

Ionic on left
Covalent on right

19
Q

Why does Al2O3 have more covalent character than MgO

A

Al3+ is smaller
Al3+ is more polarising
Distorts electron cloud around O2-

20
Q

Why do aluminium oxide and silicon dioxide not react in water

A

They are insoluble

21
Q

What is covalent character?

A

The tendency of an atom to attract a pair of electrons towards itself in an ionic bond

22
Q

Give two examples of how Al2O3 is amphoteric

A

as a base
Al2O3+6HCl –> 2AlCl3 + 3H2O

As an acid
Al2O3+ 2NaOH + 3H2O –> 2NaAl(OH)4

CHEMISTRY (12 decks)

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