CHEM 131 Lesson 3 Quiz

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1. I recently went to the dentist for a procedure that required me to have laughing gas
(nitrous oxide, or N​ 2​
O). I specified that I wanted EXACTLY 1.000 x 10​ 25​ molecules of this gas
delivered to me. If he was going to be my dentist, he had to prove to me he knew a little
chemistry. How many grams would he have to deliver?
2. When answering the question of what I would do for a Klondike bar, I said I would jump
into the Nile river with a crocodile while wearing 5.50 x 10​ 25​ atoms of lead on my body. What
would be the mass of ​ this lead in ​kg?
3. In the image below, which reaction type is represented in equation 2?
4. If I ask you to write an equation representing a chemica reaction, you must first know
5. Oxidation-reduction reactions are also known as redox reactions. We learned about their
unique characteristics in this lesson. Which of the following would be a FALSE statement
given what we learned about redox reactions?
6. There are many signs we can observe to tell us if a chemical reaction has taken place.
Which of these would NOT be one of those signs?
7. You have to be careful about pouring drano down your pipes since it is mainly
hydrochloric acid--you can't do it if they are made of aluminum because it will dissolve them!
You can't acid clean your aluminum auto parts for the same reasons: 2 Al + 6 HCl → 2 AlCl3
+ 3H2. If you were able to dissolve 10.0 mol of Al, how many many moles of hydrogen gas
could you make? NOTE: All numbers located immediately after elemental symbols should be
considered subscripts
8. You have to be careful about pouring drano down your pipes since it is mainly
hydrochloric acid--you can't do it if they are made of aluminum because it will dissolve them!

You can't acid clean your aluminum auto parts for the same reasons: 2 Al + 6 HCl → 2 AlCl3
+ 3H2. If you were able to dissolve 10.0 mol of Al, how many many moles of hydrogen gas
could you make? NOTE: All numbers located immediately after elemental symbols should be
considered subscripts
9. Sodium and chlorine are very dangerous by themselves. However, when we combine
them together in a chemical reaction, we eat it--it's table salt: 2Na + Cl2 → 2NaCl. If I want
to make 100.0 g of my own salt (because I can and that's how I roll), how much elemental
chlorine would I need? NOTE: All numbers located immediately after elemental symbols
should be considered subscripts
10. Sodium and chlorine are very dangerous by themselves. However, when we combine
them together in a chemical reaction, we eat it--it's table salt: 2Na + Cl2 → 2NaCl. If I want
to make 50.0 g of my own salt (because I can and that's how I roll), how much elemental
sodium would I need? NOTE: All numbers located immediately after elemental symbols
should be considered subscripts
11. Alkali metals are extremely reactive with water. Suppose I give you a 55.50 g chunk of
cesium and you throw it into a lake. When it reacts with water to form cesium hydroxide and
hydrogen gas, how much hydrogen in grams is theoretically produced? Write a balanced
equation for the reaction and show all work clearly and in detail to receive credit. All numbers
seen immediately following the elemental symbols are intended to be subscripts
12. Consider the solubility rules and identify all of the spectator ions when the following
chemicals react: A) lead (II) nitrate and ammonium chloride B) Barium bromide and
potassium carbonate. You must show all work (equations) clearly and in detail to receive
credit