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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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askollmeyer askollmeyer
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12 years ago
Which of the following represents a precipitation reaction?

2H2(g) + O2(g) ->> 2H2O(l)  
CaBr2(aq) + H2SO4(aq) ->>CaSO4(s) + 2HBr(g)  
2KNO3(s) ->>2KNO2(s) + O2(g)
2KBr(aq) + Cl2(g) ->>2KCl(aq) + Br2(l)
2Al(s) + 3H2SO4(aq) ->>Al2(SO4)3(aq) + 3H2(g)
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#1
12 years ago
A precipitation involves a solid coming out of a solution.  The first is two gases generating a liquid.  The third is a solid breaking down with generation of a gas.  The fourth involves a gas reacting with an aqueous solution with no solid produced.  The last has a reaction of a solid and an aq. solution with generation of a gas.  Only 2 has reaction in solution with a solid generated.
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