The Chemicals in Your Life
Chem 3070 Sample questions for Exam I
You will have 90 minutes to complete the exam. You may use the blue periodic with
anything you want written on it. You must turn in your blue periodic chart with your exam
(it will be returned). Write the color of your exam on the top of your scantron.
1.Which science is primarily concerned with the study of matter and the changes it undergoes?
a. chemistry b. biology c. geology d. physics e. none of these
2.One way of rating complexity in scientific disciplines is with respect to the number of variables in the experiments. (Generally, the more variables the bigger the error bars.) Which of the following scientific disciplines would have experiments that are the most complex with regard to the number of variables.
a. chemistry b. Human clinical drug trials c. biology d. math e. none of these
3.Both mass and weight provide a measure of the amount of matter. Mass is
a. measured only with the metric system c. dependent on location e. none of these
b. easier to measure d. independent of location
4.On Mars, gravity is 1/3 of that on Earth. What would the person's weight on Mars be if the person weighed 180 lbs on Earth?
a. 540 lbs b. 360 lbs c. 120 lbs d. 60 lbs e. none of these
5.Which of the following is an example of a physical change?
a. water evaporating from a sidewalk d. dissolving sugar in a cup of coffee
b. ice melting e. all of these
c. cutting hair
6.Which of the following is an example of a chemical change?
a. charcoal being put in a stocking c. bread being sliced e. none of these
b. water boiling d. plants getting cut with the weed wacker
7.The label on a jar of peanut butter lists: peanuts, sugar, salt and maltodextrin. From this information, peanut butter is a(an)
a. pure substance b. element c. mixture d. compound e. none of these
8.Which of the following represents a compound?
a. Cu b. Ca c. CO d. Co e. none of these
9.How many centimeters are in 0.15 meters?
a. 15 b. 150 c. 15 d. 0.0015 e. none of these
10.After a particularly grueling day studying for your chemistry exam, you reach for the Motrin bottle to get some relief for your headache. Each tablet contains 200 mg of ibuprofen (the active stuff). How many grams of ibuprofen are in each tablet?
a. 200 b. 250 c. 2.00 d. 0.200 e. none of these
11.Which of the following symbols represents the compound, fructose
a. F b. Sc c. Fr d. C6H12O6 e. none of these
12.The element that Marie Curie discovered and named after her native land was:
a. Pb b. Po c. Pm d. Cu e. none of these
13.The boiling point of water on the Celcius scale is:
a. 100 b. 32 c. 212 d. 0 e. none of these
14. How many centimeters are in 1.5 meters?
a. 15 b. 150 c. 15 d. 0.0015 e. none of these
15. How many inches are in 15 cm?
a. 5.9 b. 38.1 c. 1.5 d. 150 e. none of these
16. Arrange the following prefixes in the order of decreasing size:
a. micro, centi, kilo, milli, mega c. micro, milli, centi, kilo, mega e. kilo, micro, centi, milli
b. micro, milli, centi, mega, kilo d . mega, kilo, centi, milli, micro
17. Which of the following substances is homogeneous?
a. wood b. salt water c. a carrot d. beer e. more than one of these
18. Hydrogen peroxide decomposes into water and oxygen when exposed to heat or light or some chemicals. A tightly capped bottle of hydrogen peroxide is placed on a mass scale (a balance) and exposed to light for three weeks. The mass reading on the scale does not change. This is an example of:
a. the Law of Multiple Proportions c. the Law of Definite Proportions e. none of these
b. the Law of Constant Composition d. the Law of Conservation of Mass
19. When 20.00 g of lead and 3.12 g of sulfur react, 23.12g of lead sulfide is produced. Suppose 40.00 g of lead and 6.24 g of sulfur are allowed to react. Analysis of the reaction mixture would show:
a. 43.12 g of lead sulfide and 3.12 g of sulfide
b. 11.56 g of lead sulfide and 30.00 g of lead
c. 23.12 g of lead sulfide and 20 g of lead and 3.12 g of sulfide
d. 46.24 g of lead sulfide
e. none of these
20.Which of the following occurs during a chemical reaction:
a. matter is rearranged c. matter is conserved e. none of these
b. atoms react with other atoms d. a, b and c
21. The ability to recycle materials such as glass, aluminum or plastic is an illustration of:
a. the Law of Definite Proportions c. lots of media hype e. none of these
b. the Law of Conservation of Mass d. the ingenuity of chemists
22. The proton has a___________charge and a very ___________ mass relative to the mass of an electron
a. positive, large c. positive, small e. none of these
b. negative, large d. negative, small
23. The number of protons in an atom is called the
a. mass number c. atomic weight e. none of these
b. atomic number d. atomic mass
24. Based on the experiments done by Marsden and Geiger using particles and foil, Rutherford proposed:
a.atoms do not exist
b.atoms are like bowls of positive pudding with negative raisins scattered about
c.atoms have very small, very dense positively charged nuclei and the rest of the atom is mostly empty space
d. all of the above
e. none of the above
25.The neutron
a. has the same mass and charge as the electron
b. has a larger mass than the electron and no charge
c. has a larger mass and the same charge as the proton
d. has a smaller mass and the opposite charge as the electron
e. none of these
26. The electron has a___________charge and a very ___________ mass relative to the mass of an proton.
a. positive, large c. positive, small e. none of these
b. negative, large d. negative, small
27. The number of protons in an atom is called the
a. atomic weight c. atomic number e. none of these
b. atomic mass d. mass number
28.The number of protons in a potassium atom is
a. 1 b. 19 c. 39.098 d. 4s1 e. none of these
29.How many total electrons are there in a neutral carbon atom?
a. 7 b. 12 c. 4 d. 6 e. none of these
30.How many electrons are in the outer shell of Krypton?
a. 36 b. 18 c. 8 d. 6 e. none of these
31.How many total electrons are present in Bromine?
a. 35 b. 7 c. 9 d. 79.9 e. none of these
32.How many electrons are present in the outer shell of calcium?
a. 2 b. 3 c. 8 d. 1 e. none of these
33. Which element is a noble gas?
a. Ra b. Rb c. RV d. Rn e. none of these
34. The noble gases are a unique group of elements. They are recognized as unique due to the fact that they are
a. all gases at room temperature
b. the most reactive member of their period
c. extremely stable and unreactive
d. named after Nobel prize winners
e. none of these
35. From the periodic table, the number of valence electrons (electrons in the outer most shell) for most of the main group elements may be determined directly from the periodic table by looking at
a. the atomic number
b. the mass number which is located beneath each element
c. the period number
d. group number which is located at the top of each column
e. None of the above
36. The density of water is 1 g/ml. What is the mass of 1 liter of water?
a. 1 kg b. 1000g c. 2.2 lbs d. a, b, and c e. none of these
37. What is the mass of 50 ml of a solution that has a density of 0.79 g/ml?
a. 63.29 b. 39.5 c. 1.58 x 10-2 d. 0.158 e. none of these
38. Mr. Stone had problems with his back, so his chiropractor recommended that he refrain from
lifting anything over 10 lbs. Mr. Stone went into the Winn Dixie grocery store to get bread when he
found that Diet Pepsi (a favorite of Mrs. Stone) was on SALE for $0.99 per 2 liter bottle. Since he
went in to get just bread, Mr. Stone did not have a cart. How many 2 liter bottles of diet pepsi
could Mr. Stone carry to the check-out with out violating the chiropractor's recommendation and
risk further injury to his back? The density of Diet Pepsi is 1.0 g/ml. The bread weighs 1 pound.
a. 2.27 b. 4 c. 2 d. 4.54 e. none of these
39. What is the electron configuration of carbon?
a. 2s2 2p2. b. 1s2 2s2 2p2. c. 1s2 2s2 2p2.3s2 d. 1s2 2s2 3s2 e. none of these
40. What is the electron configuration for calcium?
a. 1s2 2s2 2p6 b. 4s2 c. 1s2 2s2 2p6 3s2 3d8 d. 1s2 2s2 2p6 3s23p64s2 e. none of these
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