CHEM 131 Midterm Examination

CHEM 131 Midterm Examination

Author: Dannie Young


1. Who discovered the atomic theory?
2. Who discovered the law of conservation of mass?
3. A lead ball has a mass of 49.0 grams and a density of 11.3 g/cm3. What is the volume of the ball?
4. What is the volume in mL of a cube of water with dimensions 11.0 cm × 11.0 cm × 11.0 cm ?
5. When the value 98.54 is rounded to two significant figures, the number should be reported as
6. Given the sequence of temps below, which one represents the Fahrenheit boiling, room temp, and freezing points of water, in that order?
7. How should someone classify grape juice?
8. Gallium metal will melt in your hand. Which of the following is a true statement about this process? It represents a _______.
9. If a nickel atom formed an ion, what charge would it have?
10. The elements located in groups 3B through 2B are known as 
11. Which of these can be found in the nucleus?
12. What would be the proper way to write the ion formula for acetate?
13. When naming Na3PO4 , it cannot be trisodium phosphate. Why?
14. We discussed diatomic molecules in this lesson. Which of these would NOT be classified in that category?
15. I recently went to the dentist for a procedure that required me to have laughing gas (nitrous oxide, or N2O). I specified that I wanted EXACTLY 1.000 x 1025 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?
16. 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 1025 atoms of lead on my body. What would be the mass of this lead in kg?
17. I have some aliens in my basement who have developed a chemical weapon in an attempt to escape. I was able to survive the first attack and capture a sample of the dangerous gas. I analyzed it to find that it had a molar mass of 648.52 grams, and its empirical formula is C5H11N2O2P. What is its molecular formula?
18. In the image below, which reaction type is represented in equation 2?
19. If I ask you to write an equation representing a chemica reaction, you must first know
20. 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?
21. 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
22. Suppose you were tasked with producing some nitrogen monoxide (a.k.a. nitric oxide). I'm sure this is often requested of you. You can do it by combusting ammonia (be careful!). The equation would be as follows: 4NH3 + 5O 2→ 4NO + 6H2O. If you form 3.50 mol of water, how much NO forms?

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