CHEM 131 Midterm Examination
CHEM 131 Midterm Examination
CHEM 131 Midterm Examination
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1. Who discovered the atomic theory?<br />
2. Who discovered the law of conservation of mass?<br />
3. A lead ball has a mass of 49.0 grams and a density of 11.3 g/cm 3 . What is the volume of the<br />
ball?<br />
4. What is the volume in mL of a cube of water with dimensions 11.0 cm × 11.0 cm × 11.0 cm ?<br />
5. When the value 98.54 is rounded to two significant figures, the number should be reported as<br />
6. Given the sequence of temps below, which one represents the Fahrenheit boiling, room temp,<br />
and freezing points of water, in that order?<br />
7. How should someone classify grape juice?<br />
8. Gallium metal will melt in your hand. Which of the following is a true statement about this<br />
process? It represents a _______.<br />
9. If a nickel atom formed an ion, what charge would it have?<br />
10. The elements located in groups 3B through 2B are known as<br />
11. Which of these can be found in the nucleus?<br />
12. What would be the proper way to write the ion formula for acetate?<br />
13. When naming Na 3 PO 4 , it cannot be trisodium phosphate. Why?<br />
14. We discussed diatomic molecules in this lesson. Which of these would NOT be classified in<br />
that category?
15. I recently went to the dentist for a procedure that required me to have laughing gas (nitrous<br />
oxide, or N 2 O). I specified that I wanted EXACTLY 1.000 x 10 25 molecules of this gas delivered to<br />
me. If he was going to be my dentist, he had to prove to me he knew a little chemistry. How<br />
many grams would he have to deliver?<br />
16. When answering the question of what I would do for a Klondike bar, I said I would jump into<br />
the Nile river with a crocodile while wearing 5.50 x 10 25 atoms of lead on my body. What would<br />
be the mass of this lead in kg?<br />
17. I have some aliens in my basement who have developed a chemical weapon in an attempt to<br />
escape. I was able to survive the first attack and capture a sample of the dangerous gas. I<br />
analyzed it to find that it had a molar mass of 648.52 grams, and its empirical formula is<br />
C 5 H 11 N 2 O 2 P. What is its molecular formula?<br />
18. In the image below, which reaction type is represented in equation 2?<br />
19. If I ask you to write an equation representing a chemica reaction, you must first know<br />
20. Oxidation-reduction reactions are also known as redox reactions. We learned about their<br />
unique characteristics in this lesson. Which of the following would be a FALSE statement given<br />
what we learned about redox reactions?<br />
21. You have to be careful about pouring drano down your pipes since it is mainly hydrochloric<br />
acid--you can't do it if they are made of aluminum because it will dissolve them! You can't acid<br />
clean your aluminum auto parts for the same reasons: 2 Al + 6 HCl → 2 AlCl3 + 3H2. If you were<br />
able to dissolve 10.0 mol of Al, how many many moles of hydrogen gas could you make? NOTE:<br />
All numbers located immediately after elemental symbols should be considered subscripts<br />
22. Suppose you were tasked with producing some nitrogen monoxide (a.k.a. nitric oxide). I'm<br />
sure this is often requested of you. You can do it by combusting ammonia (be careful!). The<br />
equation would be as follows: 4NH 3 + 5O 2 → 4NO + 6H 2 O. If you form 3.50 mol of water, how<br />
much NO forms?
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