Chapter 3: # 70, 71, 76
Not collected, but these are great problems to challenge yourself. Really good subjects for study groups. Answers are written in the form of a comment (below) – no peeking!
Fully worked-out answers can be obtained upon email request to any of the study group coordinators, or me, or Nag. But we’ll only send you one answer. To get more than one answer, you’ll need to find other students (hopefully with different answers!) or a study group.
Kyle,
Thanks for the recommendation. I added this link as “Interactive Periodic Table” on the home page.
I found this periodic table online and I figured I would share it for everyone to see. It’s pretty interactive and has a lot of good features on it (i.e. like a search feature, color codes of metals/nonmetals/etc, properties, etc)
I find it to be a little more helpful than a regular periodic table, although I use both.
http://www.ptable.com/
Answers to Chapter 3:
#70: The first reaction is an oxidation-reduction reaction and a precipitation reaction. The second reaction is an acid-base reaction and a gas-forming reaction.
Acids: H2S Bases: NaHCO3
Oxidizing agents: Ag2S Reducing agents: Al
#71: One possibility:
MgCO3(s) + 2 HCl(aq) -> MgCl2(aq) + H2O(l) + CO2(g)
Use a gas-forming reaction to form magnesium chloride, water, and carbon dioxide (which escapes from solution as a gas). Heat the solution to evaporate the water, giving solid magnesium chloride.
#76: One possible answer:
BaCO3(s) + 2 HCl(aq) -> BaCl2(aq) + H2O(l) + CO2(g)