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Chemistry > period 3 oxides > Flashcards

period 3 oxides Flashcards

1
Q

reaction of sodium with cold water

A

fizzes
2Na(s) +2H2O —> 2NaOH + H2

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2
Q

magnesium with steam equation

A

Mg(s) + H2O(g) —–> MgO (s) +H2

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3
Q

does magnesium react faster slower with hot water than cold water

A

faster

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4
Q

what colour flame does sodium burn with and what colour is its precipitate

A

yellow flame
white precipitate

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5
Q

equation of sodium burning in oxygen

A

4Na(s) +O2(g) —-> 2Na2O

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6
Q

what colour flame and precipitate does Mg produce when burned in O2

A

white flame
white ppt

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7
Q

what colour flame and precipitate is formed when Al is burned in O2

A

white flame and white ppt

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8
Q

what colour flame and precipitate is produced when silicon is burned in oxygen

A

white flame and white ppt

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9
Q

what colour flame and precipitate is formed when phosphorus is burned in oxygen

A

white flame and white ppt

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10
Q

equation for mg being burned in o2

A

2Mg(s) + O2(g) –> 2MgO(s)

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11
Q

equation for al being burned in o2

A

4Al(s) + 3O2 —-> 2Al2O3

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12
Q

equation for si being burned in oxygen

A

Si(s) + O2 —> SiO2(s)

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13
Q

reaction of phosphorus being burned in oxygen

A

4P(s) + 5O2 —> P4O10

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14
Q

how many lone pair does so2 have

A

1
then the two oxygens are both bonded by double bonds

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15
Q

what is the structure of sulphur trioxide

A

sulphur surrounded by 3 oxygens all with double bonds

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16
Q

what kind of structure do Na2O, MgO and Al2O3 have

A

ionic

17
Q

does Al2O3 display covalent character

A

yes

18
Q

why does Al2O3 display covalent character

A

ionic bonding is weakened by charged Al3+ and oxide ions.

19
Q

why might aluminium oxide react as it should

A

the high lattice strength of Al2O3 and its solubility in water make an impermeable layer to air and water

20
Q

what kind of structure do P4O10 AND SO2 have

A

simple covalent

21
Q

which has a higher Mpt P4O10 or SO2

A

SO2 - it is larger - therefore has more e and higher mpt

22
Q

equation between Na2O and H2o (l)

A

2Na+(aq) + 2OH- (aq)

this is a vigorous exothermic reaction

pH13

23
Q

reaction between MgO + h20

A

Mg(OH)2
pH 9

24
Q

what do ionic oxides act as

A

brownsted lowry bases

25
Q

which is better for treating acid in e.g. rivers or in the stomach NaOH or Mg(OH)2

A

Mg(OH)2

it is sparingly soluble and weakly alkaline - so using an excess would not make the water majorly alkaline

Chemistry (27 decks)

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