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Chemistry - inorganic > 2.4 period 3 > Flashcards

2.4 period 3 Flashcards

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1
Q

sodium

A

soft metal
giant metallic structure - positive metal ions attracted to a sea of delocalised electrons
forms Na+

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2
Q

magnesium

A

silver metal
giant metallic structure
stronger than sodium as it forms Mg 2+

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3
Q

aluminium

A

silver metal
giant metallic structure
stronger than sodium and magnesium as it forms Al3+

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4
Q

silicon

A

shiny solid
non - metal/ metaloid (conducts electricity)
giant covalent structure - strong covalent bonds
high melting point

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5
Q

phosphorus

A

P4
red or white solid - non metal
simple covalent structure - lower melting point

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6
Q

sulfur

A

S8
yellow solid - non metal
simple covalent structure
higher melting point than P4 as it is a larger molecule so has stronger van der waals

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7
Q

reaction of sodium with water

A

reacts vigorsouly and floats on the surface. fizzes producing hydrogen gas

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8
Q

reaction of magnesium with water

A

reacts very slowly to form magnesium hydroxide
reacts quicker with steam to form magnesium oxide

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9
Q

reactions of oxygen with oxygen

A

sodium - melts, yellow flame with a white solid
magnesium - white flame and white solid
aluminium - white flame and white solid
silicon - white flame and white solid
phosphorus - white flame and white solid + smoke
sulfur - blue flame + melting

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10
Q

ionic oxides

A

Na2O, MgO and Al2O3
ionic metal oxides to form giant ionic lattice structures
strong electronegativity creates strong ionic bonds
higher melting point

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11
Q

macromolecular oxides

A

SiO2
strong covalent bonds
high melting boiling and melting

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12
Q

simple molecular oxides

A

P4O10 and SO2
weak van der waals
lower melting points
P4O10 is a larger molecule that SO2 so has stronger van der waals

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13
Q

reaction of Na2O and MgO with water

A

both are basic and ionic
both dissolve
Na2O - pH 12-14
MgO - pH 10

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14
Q

reaction of Al2O3 and SiO2 with water

A

Al2O3 is amphoteric ( ionic with some covalent characteristics)
SiO2 is covalent
both will be insoluble
both pH 7

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15
Q

reaction of P4O10, SO2 and SO3 with water

A

all acidic and covalent
all react violently
P4O10 - pH 1/2
SO2 - pH 2/3
SO3 - pH 0/1

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16
Q

trend of acidity across period 3

A

acidity increases as you move right across the period
sodium and magnesium oxide are the only alkaline oxides

Chemistry - inorganic (4 decks)

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