period 3 oxides

Question 1

reaction of sodium with cold water

Answer 1

fizzes
2Na(s) +2H2O —> 2NaOH + H2

Question 2

magnesium with steam equation

Answer 2

Mg(s) + H2O(g) —–> MgO (s) +H2

Question 3

does magnesium react faster slower with hot water than cold water

Answer 3

faster

Question 4

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

Answer 4

yellow flame
white precipitate

Question 5

equation of sodium burning in oxygen

Answer 5

4Na(s) +O2(g) —-> 2Na2O

Question 6

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

Answer 6

white flame
white ppt

Question 7

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

Answer 7

white flame and white ppt

Question 8

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

Answer 8

white flame and white ppt

Question 9

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

Answer 9

white flame and white ppt

Question 10

equation for mg being burned in o2

Answer 10

2Mg(s) + O2(g) –> 2MgO(s)

Question 11

equation for al being burned in o2

Answer 11

4Al(s) + 3O2 —-> 2Al2O3

Question 12

equation for si being burned in oxygen

Answer 12

Si(s) + O2 —> SiO2(s)

Question 13

reaction of phosphorus being burned in oxygen

Answer 13

4P(s) + 5O2 —> P4O10

Question 14

how many lone pair does so2 have

Answer 14

1
then the two oxygens are both bonded by double bonds

Question 15

what is the structure of sulphur trioxide

Answer 15

sulphur surrounded by 3 oxygens all with double bonds

Question 16

what kind of structure do Na2O, MgO and Al2O3 have

Answer 16

ionic

Question 17

does Al2O3 display covalent character

Answer 17

yes

Question 18

why does Al2O3 display covalent character

Answer 18

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

Question 19

why might aluminium oxide react as it should

Answer 19

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

Question 20

what kind of structure do P4O10 AND SO2 have

Answer 20

simple covalent

Question 21

which has a higher Mpt P4O10 or SO2

Answer 21

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

Question 22

equation between Na2O and H2o (l)

Answer 22

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

this is a vigorous exothermic reaction

pH13

Question 23

reaction between MgO + h20

Answer 23

Mg(OH)2
pH 9

Question 24

what do ionic oxides act as

Answer 24

brownsted lowry bases

Question 25

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

Answer 25

Mg(OH)2 it is sparingly soluble and weakly alkaline - so using an excess would not make the water majorly alkaline

Question 26

is aluminum oxide insoluble in water

Answer 26

yes

Question 27

is silicon dioxide insoluble in water

Answer 27

yes

Question 28

an equation for the reaction between sodium oxide and sulfuric acid

Answer 28

Na2O(s) + H2SO4 (aq) ----->Na2SO4(aq) + H2O (l)

Question 29

what do sodium and magnesium oxides react to form

Answer 29

salt and water but this is ONLY mg and Na

Question 30

what is the equation between magnesium oxide and hydrochloric acid

Answer 30

MgO(s) +2HCl (aq) --->MgCl2(aq) +H2O(l)

Question 31

what type of oxide is aluminium oxide

Answer 31

and amphoteric oxide it reacts with both acids and bases

Question 32

what is the reaction of Al2O3 and HCl

Answer 32

Al2O3 +6HCl ---> 2AlCl3 (aq) +3H2O (l)

Question 33

what is the reaction equation between Al2O3(s) +2NaOH (aq) +3H2O

Answer 33

Al2O3 +2NaOH +3H2O -->2NaAl(OH)4

Question 34

what will happen to sillicon dioxide when reacted with hot conc sodium hydroxide

Answer 34

it will react as a weak acid with strong bases a colourless solution of sodium silicate will form

Question 35

what is the the equation between SiO2 and conc NaOH

Answer 35

SiO2 (s) + 2NaOH (aq) --- Na2SiO3 (aq) + H20(l)

Question 36

what is the overall equation of the reaction of H3PO4 and conc NaOH

Answer 36

3NaOH (aq) +H3PO4-----> Na3PO4(aq) +3H2O

Question 37

What happens when sulphur dioxide reacts with sodium hydroxide

Answer 37

first SO2(aq) + NaOH(aq) ---> NaHSO3 NaHSO3 +NaOH ----> Na2SO3 +H2O