Honors Chemistry Check Answers.
1.
2. The sugary soft drink provides more energy
3. A sports drink can be made using water, sugar, and salt. A few interested
students may say something like coconut water, which is true, or suggest adding
prepared electrolyte mixes.
Most processed food has plenty of salt. Fresh fruits have sugars and a variety of
electrolytes. It’s pretty open here, mainly to illustrate that electrolytes are in
much of what we eat.
4. Possible answers include:
sodium iodide (which the question leads to), NaI
Potassium chloride, KCl
potassium iodide, KI
potassium iodate, KIO3
(source: Wikipedia, “iodized salt”, en.wikipedia.org, retrieved 2012.02.13)
5. Sodium bicarbonate
6. HCH3COO, CH3COOH, CH3CO2H, or C2H3O2
7. NaHCO3(aq)+CH3COOH(aq)→NaCH3COOH(aq)+H2O(l)+CO2(g), [not readily
classifiable] or
(1) NaHCO3(aq)+CH3COOH(aq)→H2CO3(aq) + NaCH3COO(aq) [double
displacement]
(2) H2CO3(aq) →H2O(l)+CO2(g) [decomposition]
8. This one will likely cause students a head ache, as it is written; if they recognize
that it’s a two-step reaction, they will see that the first step, with carbonic acid
as a product (H2CO3), then they may classify the first step as double-
displacement, and the second as decomposition. Otherwise it is not neatly
classifiable. I leave it up to the teacher whether to grade this; if the teacher
desires to grade it, some additional info is likely needed.
9. There’s a 1:1 ratio in moles of sodium bicarbonate to moles of acetic acid in the
reaction, so
10. Sodium glutamate, or monosodium glutamate.
11. The question is leading, of course; the teacher can investigate for him or herself
whether there is convincing evidence that MSG is harmful. As for potassium
citrate, most Americans could use a little more potassium in their diet, and
citrate is common; it is a component of citric acid.