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Question 1 of 11
7.0 Points

When I was recently living in Germany, the cost of gasoline was about 1.60 euro per liter. The most I could pump to fill up the empty tank on my VW Golf was 50.00 euro worth of gas at a time, after which amount the gas pump would shut off. This 50.00 euro worth of gas would last for about 190 km. (A) Given that the currency exchange rate was $1.00 = 1.12 euro, what was the cost of gasoline in dollars per gallon? (B) What was my gas mileage (fuel efficiency) in miles per gallon? All work must be shown , labeled , and explained in detail to receive credit. Note that where applicable, superscripts (X 2 ) can be written as X^2 and subscripts (X 2 ) can be written as X_2 if it saves you time.

Question 2 of 11
7.0 Points

My dog weighs 58.0 lbs. I put him into a bathtub containing 47.0 gallons of water when filled to the very top. After I put him in, I collected all the water that ran over the side of the tub, and found it to be equal to 1.923 gallons. (A) What is the density of my dog in grams per cubic centimeter? (B) What if next time I do this he gains 4.0 lbs. and grows big enough to displace 2.10 gallons. Will he still have the same density? Explain and prove your answer. All work must be shown , labeled , and explained in detail to receive credit. Note that where applicable, superscripts (X 2 ) can be written as X^2 and subscripts (X 2 ) can be written as X_2 if it saves you time.

Question 3 of 11
7.0 Points

Theoretically speaking, how many moles of lithium bromide can be produced if we react 9.1 moles of CaBr 2 and 5.7 moles of LiCl? Reaction: CaBr 2 + 2LiCl → 2LiBr + CaCl 2 . You must show all work clearly and in detail to receive credit. All numbers seen immediately following the elemental symbols are intended to be subscripts.

Question 4 of 11
7.0 Points

Describe the “anatomy” of an atom. Be sure to discuss all subatomic particles, any associated charges, their locations, how they interact with one another, and explain which of these particles actually identify the atom on the periodic table. Do not forget to mention which of these particles may change in number in the case of isotopes.

Question 5 of 11
7.0 Points

I cook my pasta by putting a little salt in the boiling water. If my pasta water is a 2.90% NaCl solution by mass with a density of 1.21 g/mL, how many mL of my pasta water contains 2.00 g of sodium? You must show all work clearly and in detail to receive credit. All numbers seen immediately following the elemental symbols are intended to be subscripts.

Question 6 of 11
7.0 Points

IN YOUR OWN WORDS, who was John Dalton, and why is he so important to chemistry? What did he “discover” that is so central to our study of chemistry? Explain why it is important.

Question 7 of 11
7.0 Points

You get up in the morning one day and realize that your water is not running. So not just a cold shower, but no shower! Use the scientific method to develop a strategy by which you would determine what caused your water to not work. Include in your answer what you would do in the major steps of your experiment from beginning to the end.

Question 8 of 11
7.0 Points

Describe the difference between accuracy and precision. Provide one example from your everyday life when accuracy or precision has been very important, and be sure to identify which was more important in your example. Answer in complete sentences and be thorough to earn full credit.

Question 9 of 11
7.0 Points

Assume you take a sample of 13.4 g Al and oxidize it (in an excess stream of O 2 ) to produce 2.10 g of Al 2 O 3 . Calculate the percent yield of Al 2 O 3 . Reaction: 4 Al + 3 O 2 → 2 Al 2 O 3 . You must show all work to receive credit. All numbers immediately following elemental symbols are subscripts.

Question 10 of 11
7.0 Points

Give the A) Element Symbol, B) Atomic Number, C) Number of Protons, D) Number of Neutrons, (E) Mass Number, and (F) total Number of Electrons for: Cesium–135 and Francium-228

Question 11 of 11
15.0 Points

When I am driving around my Volkswagon I burn (C8H18), or octane in my engine, the yield of products (carbon dioxide and water) is 93%. (Hint: oxygen is required)

1) Write out a balanced chemical equation showing the combustion of octane.

2) If 31.0 g of octane is burned with 31.0 g of oxygen what is limiting, if anything?

3) What is the mass of carbon dioxide produced (don’t forget about the yield) in this engine given 31.0 g of octane is burned with 31.0 g oxygen?

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