Chemical equations - Ch6

Question 1

Law of conservation of mass

Answer 1

The total mass of the products of a chemical reaction is the same as the total mass of the reactants.

Question 2

Law of conservation of matter

Answer 2

In any chemical reaction, matter is neither created nor destroyed but merely changes from one form into another.

Question 2

Sulfate / sulfite anion test

Answer 2

BaCl2 in both, white ppt, HCl, sulfite dissolves, sulfate stays.

Question 2

Carbonate / Hydrogen carbonate anion test

Answer 2

HCl to both, fizzing, limewater = colourless –> milky white, MgSO4, carbonate white ppt, H.Carbonate no white ppt.

Question 2

Chloride anion test

Answer 2

Silver nitrate, whit ppt, ammonia, ppt dissolves.

Question 2

Nitrate ion (brown ring) anion test

Answer 2

Freshly prepared FeSO4, conc. H2SO4 slowly at angle, brown ring at junction of two layers.

Question 3

Phosphate ion anion test

Answer 3

Ammonium molybdate, conc. nitric acid, heat, yellow ppt (ammonium phosphomolybdate).