Hangzhou International School
Chemistry
Unit 4: Ions and their Reactions
Quiz 4.3: Solubility and the Copper Reaction Cycle
Name:_______________________________
Fill in each blank with the correct formula from the “compound bank.”
A formula may be used once, more than once, or not at all.
Cu
Cu(NO3)2
Cu(OH)2
H2O
NaNO3
NO2
HNO3
NaOH
CuO
1. _______________was added to Cu(NO3)2 solution to produce a blue precipitate.
2. _______________ is a black precipitate.
3.________________ is called nitric acid.
4.________________ is a base.
5.________________ causes a brown gas to form when it is poured onto copper.
6.________________ quickly turns into copper (II) oxide when heated.
7.________________ is called copper (II) nitrate.
8.________________ is a blue solid that does not dissolve in water.
9.________________ reacts with nitric acid to release NO2 gas.
10._______________is present in the solution that separated from the CuO by decanting.
(hint: we are going to collect some of this compound as a solid in a
petri dish by letting the water from the solution evaporate.)
Created by Thomas Robinson
Hangzhou International School
Chemistry
Unit 4: Ions and their Reactions
11. Circle the elements that, when combined with sulfate, will form a precipitate.
Ni
Pb
K
Ba
12. Circle the formulas of the compounds which are not able to dissolve in water.
LiOH
CaS
AgNO3
13. Circle the formulas of the soluble compounds.
Fe2(CO3)3
Na3PO4
Pb(SO4)2
14. You are given a sample called “Solution X” and told that is has the Ca2+ ion in it. You are
asked to precipitate the Ca2+ ion. Two other solutions, listed below, are available to you. Which
one will you mix with Solution X in order to precipitate the Ca2+ ion? Give reasons for your
answer.
NaOH
Na2SO4
Created by Thomas Robinson