Metals Reactions With Acids And Displacement

Question 1

What is the difference between HCL (aq) and HCL (g)?

Answer 1

HCL (g) is hydrochloric acid’s pure form (compound) and is HYDROGEN CHLORIDE, (aq) is HCL gas mixed with water and is a mixture

Question 2

Fe + H2SO4 (sulphuric acid) ——> FeSO4 (aq) + H2 observations

Answer 2

Metal dissolves, colourless gas bubbles and pale Green solution form
Also is FESO4 (Fe2) NOT Fe2(SO4)3 (Fe3)

Question 3

Ca reaction with H2SO4 (aq) equation + observations
Pb reaction with H2SO4 and HCL

Answer 3

Ca(s) + H2SO4(aq) ——> CaSO4 (S) + H2(g)
Pb(s) + 2HCL (aq) ——> PbCl2 (S) + H2
Pb(s) + H2SO4 (aq) ——> PbSO4 (S) +H2

Colourless gas bubbles are only evolved for a short time bc the insoluble solid layer of CaSO4 prevents Ca from further reaction with H2SO4 THUS this reaction isn’t used to prepare H2

Question 4

Zn (s) + CuSO4 (aq) ——> ZnSO4 + Cu observations

Answer 4

Zn dissolves
2. Brown solid (Cu) is formed
3. Blue solution (CuSO4) fades

Question 5

Cu (s) + 2AgNO3 (aq) ——> Cu(NO3)2 (aq) + 2Ag (s) observations

Answer 5

1. Cu dissolves
2. Silvery solid (Ag) forms
3. Colourless to Blue solution (Cu(NO3)2)

Question 6

In displacement, can metals be displaced in (l) state?

Answer 6

Yes, metals can be displaced in (aq) or molten (l) state bc if they’re in (s) bc particles can’t move freely

Question 7

X and Y are 2 different metals, when they’re put into copper(II) sulphate these 2 reactions happen
X: Brown solid formed + colourless gas evolved
Y: Brown solid
Which metal is more reactive?

Answer 7

X. Brown solid: copper, colourless gas: H2
X more reactive bc it reacts with H2O instead of just CuSO4 to form H2 too

Question 8

Why burn a flame at the end of the delivery tube?

Answer 8

Use up remaining H2 in a controlled way to prevent accumulation of H2 which may cause explosion

Question 9

Heating excess carbon in O2

Answer 9

2C + O2 —> 2CO

Question 10

Heating carbon in excess oxygen

Answer 10

C + O2 -> CO2

Question 11

Heating sodium metal in an atmosphere of chlorine gas

Answer 11

2Na + Cl 2——> 2NaCl

Question 12

Which compounds are all soluble in water?

Answer 12

Compounds of Grp I metals, ammonium (NH 4+), NO3- (nitrate), HCO3- (hydrogencarbonate)

Question 13

Solubility of Cl-, Br-, I-, SO4 2-

Answer 13

Most are soluble except for compounds with Ag and Br
SO4 2-: Most are soluble except for compounds with Ca, Ba, Pb