Question

Complete the missing components/variables given as '?' in the following reactions:

1) Pb(NO3 )2 (aq) + 2KI (aq) ⇨ PbI2 (?) + 2KNO3 (?)

2) Cu (s) + 2AgNO3 (aq) ⇨ Cu(NO3 )2 + ? (?)

3) Zn (s) + H2SO4 (aq) ⇨ ZnSO4 (?) + H2 (?)

4) CaCO3 + ? ⇨ CaO (s) + CO2 (g)

Answer 1

Answer:

1) Pb(NO3 )2 (aq) + 2KI (aq) ⇨ PbI2 (?) + 2KNO3 (?)

Answer: Pb(NO3 )2 (aq) + 2KI (aq) ⇨ PbI2 (s) + 2KNO3 (a)

2) Cu (s) + 2AgNO3 (aq) ⇨ Cu(NO3 )2 + ? (?)

Answer: Cu (s) + 2AgNO3 (aq) ⇨ Cu(NO3 )2 + Ag (s)

3) Zn (s) + H2SO4 (aq) ⇨ ZnSO4 (?) + H2 (?)

Answer: Zn (s) + H2SO4 (aq) ⇨ ZnSO4 (aq) + H2 (g)

4) CaCO3 + ? ⇨ CaO (s) + CO2 (g)

Answer: CaCO3 + Heat ⇨ CaO (s) + CO2 (g)

Answer 2

Explanation:

1) 2Kcl

2) Ag

3) so4 ² and h²0

4) it is correct

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