) With what observations can we understand that a reaction has taken place? 2) How is BaSO4 prepared in the laboratory? Which reagents do you prefer to use? 3) Classify the following reactions (write type): a) 2S + 3 O2 2SO3 __________ b) KC1O3 KC1 + 3/2 O2 __________ c) 2 Al + 6 HC1 2 AlCl3 + 3 H2 __________ d) 2 KOH + CaC12 Ca (OH) 2 + 2 KC1 __________
1) With what observations can we understand that a reaction has taken place?
2) How is BaSO4 prepared in the laboratory? Which reagents do you prefer to use?
3) Classify the following reactions (write type): a) 2S + 3 O2 2SO3 __________
b) KC1O3 KC1 + 3/2 O2 __________
c) 2 Al + 6 HC1 2 AlCl3 + 3 H2 __________
d) 2 KOH + CaC12 Ca (OH) 2 + 2 KC1 __________
4) Give a chemical formula for the following.
a) __________ dissolving KC1 but not AgCl
b) dissolving CuCO3 but not BaSO4 __________ c) __________ that dissolves FeS as well as Ag2O
d) dissolving MgO as well as Ba (OH) 2 __________
5) Give a chemical formula for the following.
a) __________ which precipitates with both KC1 and CuC12
b) __________ that precipitates with both NaCl and Na2CO3
c) Precipitating with AgNO3 but not with Cu (NO3) 2 __________
d) __________ which precipitates with CuC12 but not with KC1
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