P3 elements+oxides(p1)

Question 1

explain magnesium and sodiums reaction with water?why?

Answer 1

sodium- reacts vigorously producing hydrogen gas
magnesium- reacts very slowly forming an alkaline solution
it is requires less energy to remove one electron rather then two like magnesium

Question 2

which is more reactive with water? magnesium or sodium

Answer 2

sodium

Question 2

why do Mg,Al,Na oxides all have high melting points?

Answer 2

this is because they form giant ionic lattices. strong forces of attarction=lot of heat energy to break bonds

Question 3

write these equations for P3 element+O2
- sodium
-magnesium
-aluminum
-silicon
-sulfur
-phosphorus

Question 4

why does magnesium oxide have the highest melting point out of all the oxides?

Answer 4

magnesium forms 2+ ions which attract O2- ions more strongly

Question 5

why does aluminium oxide have the lowest melting point?

Answer 5

because the electronegativity between Al and O isnt as large as Mg and O, therefore the O2- cant attract the electrons in the metal-oxygen as strongly making it partially covalent

Question 6

why does silicon dioxide have the highest melting point out of the non-metals oxides?

Answer 6

it has a giant macromolecular structure w/ strong covalent bonds=high heat energy to break

Question 7

what solutions do simple covalent oxides and ionic oxides produce?

Answer 7

covalent-acidic
ionic- basic

Question 8

give the formula of phosphoric acid

Answer 8

H3PO4

Question 9

give the formula of aluminum sulfate.

Answer 9

Al2(SO4)3

Question 10

what oxides are insoluble in water?

Answer 10

aluminium and silicon