Name: _____KEY______________
CHEM&139 - EXAM I – CHAPTERS 1-4 – Spring 2009 – 100 POINTS
SHOW YOUR WORK!!!
Important equations on the last page
1. Which one of the following is a compound? (4 points)
a. Gold
b. Mercury
c. Titanium
d. Salt water
e. Salt
2. Another name for a homogeneous mixture is: (4 points)
a. Pure substance
b. Compound
c. Substance
d. Element
e. None of the above
3. All the below are examples of extensive properties EXCEPT: (4 points)
a. Mass
b. Volume
c. Melting point
4. All the below are examples of physical properties EXCEPT: (4 points)
a. Radon’s radioactivity
b. Radon’s inertness
c. Radon’s electron configuration
d. Radon’s density
5. You have 20.0 moles of each of the following elements: Te, Ti, Tc, Tb, and Tm.
Which sample has the largest number of moles? (4 points)
a. Te
b. Ti
c. Tc
d. Tb
e. Tm
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6. According to the Periodic Table of the Elements, the largest collection of
naturally occurring metals is found in the (4 points)
a. Alkali group
b. Alkaline earth metal group
c. Transition metals
d. Lanthanides
e. Halogens
7. What element is in the fifth period in Group IB? (4 points)
a. Ag
b. Cd
c. Pd
d. Cu
e. Au
8. Elements that border the step-ladder on the Periodic Table are known as the
______________. (4 points)
a. Transition
b. Actinide
c. Alkali
d. Metalloids
9. Am-243 and Am-241 are known as ____________. (4 points)
a. Isotopes
b. Molecules
c. Compounds
d. Allotropes
10. You ran a few experiments and you obtained the following data (in cm): 18.2,
18.3, 18.1, and 18.3. You then checked in your textbook and found that the actual
value is 29.6. Your data have: (4 points)
a. “Good” precision/”good” accuracy
b. “Good” precision/”bad” accuracy
c. “Bad” precision/”bad” accuracy
d. “Bad” precision/”good” accuracy
11. All the following are diatomic EXCEPT for: (4 points)
a. Hydrogen
b. Iodine
c. Xenon
d. Fluorine
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12. Classify the following as a compound, element, homogeneous mixture, or
heterogeneous mixture (2 points each - 4 points total)
a. Margarine in oil
Homogeneous mixture
b. Vinegar in water
homogeneous mixture
13. Classify the following as either a chemical change, physical change, physical
property, or chemical property: (2 points each - 8 points total)
a. The production of flatulence in mammals 
Chemical change
b. Nail polish remover evaporating when the top is left open
Physical change
c. Platinum’s resistibility to corrosion in air
Chemical property
d. The stench of an egg
Physical property
14. Give the symbol for the following isotope: (2 points total)
a. Np-237
237
93
Np
Convert to scientific notation/normal notation: (2 points each – total of 4 points)
15. 0.000050
5.0 x 10-5
16. 8.0 x 104
80,000
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State the number of significant figures for the following: (2 points each – total of 6
points)
17. 0.050
2
18. 20
ambiguous
19. 
infinite
Round off the following numbers to their respective significant figures (in parentheses):
(2 points each – total of 4 points)
20. (0.0990) (to 2 significant figure)
0.099
21. (9,989.7) (to 1 significant figure)
1 x 104
Solve the following, rounding at the end: (3 points each – total of 9 points)
22.
75. 0 6
(62.4+12.66)
___

 3.66  4
2
2
[(4.110 )  (5 10 )]
2 0.5
___
23. (2.0 x 10-1) + (8.1 x 102) = 0.20 + 810 = 810.020=810 = 8.1 x 102
24.
2
(78  900) 82 ___

 30  30.
(7.4  20.) 2 7 .4
___
25. The mean surface temperature on Venus is 735K. What is this in F? (5 points)
735=C + 273.15
C = 461.85
F = 1.80 x 461.85 + 32
F = 863.33 = 863
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26. A patient is suffering from a bacterial malady. He requires 15 grams of an
antibiotic that comes in 250.0 mg tablets. He is supposed to take one tablet every
four hours. How many days will he need in order to finish this regimen? (8 points)
15 g 
1000mg 1tablet
4hr
1day



 10. days
1g
250.0mg 1tablet 24hr
27. Convert 32.7 ft3/week to dL/second? (2.54 cm = 1 in; 1 ft = 12 in.) (6 points)
32.7 ft 3 1wk 1day
1hr
1min 12in 3 2.54cm 3 1mL
1L
10dL 0.0153dL




(
) (
) 



3
wk
7days 24hr 60 min 60s
1 ft
1in
1cm 1000mL 1L
s
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o
C + 273.15 = K
°F = 1.80 x °C + 32
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