Aleksza Chemistry 2013-14
Ted-Ed-Acids & Bases
(http://ed.ted.com/lessons/the-strengths-and-weaknesses-of-acids-and-bases-george-zaidan-and-charles-morton)
Name:______MOD:______(32pts)
Multiple Choice: Select the best single answer and write it on the line provided. (2 pts each)
____1. What’s the difference between a proton and a positively charged hydrogen ion?
AProtons are neutral and hydrogen ions have a positive charge
BHydrogen ions have one electron and protons don’t have any
CProtons weigh more than hydrogen ions
DThey’re the same thing
____2. Which of the following statements is true:
AOur stomachs are about as acidic as our blood is basic
BOur stomachs are about as basic as our blood is acidic
COur stomachs are far more acidic than our blood is basic
DOur stomachs are far more basic than our blood is acidic
____3. Which acid is stronger, hydrochloric or acetic?
AHydrochloric
BAcetic
CThey’re the same strength
DNobody knows
____4. A proton deposit customer (an acid) is most similar to ______.
AA proton withdrawal customer
BAn electron withdrawal customer
CAn electron deposit customer
DNone of the above
_____5. If you were to mix a strong acid with a weak base, would they completely neutralize each other?
AYes, always
BNo, because a weak base cannot neutralize a strong acid
CNo, because only acids can neutralize acids
DThere’s no way to tell from the information given
Open Ended Questions: Respond appropriately regarding the questions asked. Use the space provided or you may attach additional paper. Point values differ between questions.
Two important characteristics of acids and bases are: (1) strength and (2) concentration. The video discussed strength, but not concentration.
6. What is the difference between a strong acid and a weak acid? (3 pts)
7. Vinegar is about 5% acetic acid. Is this a measure of its strength or concentration? (3 pts)
8. If you were given the choice between drinking a solution of 0.1% hydrochloric acid (a strong acid) to 70% acetic acid (a weak acid), which would you choose and why? Is there any additional information you’d need to answer this question? (Note: DON’T DRINK THINGS THAT AREN’T MEANT TO BE DRUNK. THIS IS PURELY A THOUGHT EXPERIMENT.) (5 pts)
9. Suppose you mix hydrochloric acid (a strong acid) with ammonia (a weak base). Would the final mixture be acidic, basic, or neutral? As you might have guessed, there’s not enough information given to answer the question. What other information would you need? (5 pts)
10. Why is donating a proton not very different from accepting an electron? At about 1:20 (time into video), the picture for hydrochloric acid was shown. Draw equivalent pictures for acetic acid and ammonia. (almost like Lewis dot structures.) In each case, show the donated (or accepted) proton (or electron). (6pts)