Name: ___________________
CHEM&139_Late Start - EXAM I – CHAPTERS 1-4 – Fall 2008 – 100 POINTS
SHOW YOUR WORK!!!
Important equations on the last page
1. Calculate the moles of Na in a 4.15 mg sample. (4 points)
a. 1.81 x 10-4
b. 9.54 x 10-2
c. 1.05 x 10-2
d. 5.54 x 103
2. What alkaline earth metal is located in the fourth period? (4 points)
a. K
b. Ca
c. Ga
d. Ge
3. What is the mass of 5.8 x 1018 atoms of Ne? (4 points)
a. 9.6 x 10-6g
b. 1.9 x 10-4g
c. 4.8 x 10-7g
d. 5.1x103g
4. All the below are examples of physical properties of a chemical substance
EXCEPT: (4 points)
a. Density
b. Reactivity in air
c. Smell of chemical
d. Taste of chemical
5. What is the identity of an atom that has 28 neutrons and mass number of 52? (4
points)
a. Cr
b. Te
c. Ni
d. Hg
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6. According to the Periodic Table of the Elements, the largest collection of metals
is found in the (4 points)
a. Alkali group
b. Alkaline group
c. Transition group
d. Lanthanide group
e. Halogen group
7. What element is in the seventh period in Group 6B? (4 points)
a. Ta
b. Bh
c. W
d. Sg
e. Mt
8. Which term best describes carbon dioxide, CO2? (4 points)
a. Homogeneous mixture
b. Heterogeneous mixture
c. element
d. chemical compound
9. The density of liquid mercury is 13.5 g/mL. What mass of mercury will fill a
0.500 L. (4 points)
a. 3.70 x 10-2g
b. 6.75g
c. 27.0g
d. 37.0g
e. 6.75 x 103g
10. A cube of iron has a mass of 29.31 g. If each side of the cube has dimensions of
1.55 cm, what is the density of iron? (4 points)
a. 0.127 g/cm3
b. 5.92 g/cm3
c. 7.87 g/cm3
d. 12.2 g/cm3
11. All the following are diatomic EXCEPT for: (4 points)
a. fluorine
b. hydrogen
c. iodine
d. oxygen
e. none of the above
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12. Classify the following as a compound, element, homogeneous mixture, or
heterogeneous mixture (2 points each - 4 points total)
a. Bronze (an alloy)
Homogeneous mixture
b. Lard
compound
13. Classify the following as either a chemical change, physical change, physical
property, or chemical property: (2 points each - 8 points total)
a. All metals save mercury are solids at room temperature
Physical property
b. Hemoblogin fails to react with nitrogen gas
Chemical property
c. Hydrogen cyanide gas bonds to hemoglobin thereby disallowing oxygen
from bonding and creating an unusable bio-organic compound
Chemical change
d. Condensation of water while exhaling on a cold day
Physical change
14. Give the symbol for the following isotope: (2 points total)
a. K-40
40
19 K
Convert to scientific notation/normal notation: (2 points each – total of 4 points)
15. 0.000590
5.90 x 10-4
16. 6.3 x 104
63,000
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State the number of significant figures for the following: (2 points each – total of 6
points)

17.
unlimited/infinite/one
2
18. 400
one
19. 0.000008
one
Round off the following numbers to their respective significant figures (in parentheses):
(2 points each – total of 4 points)
20. (975,000,000,000) (to 1 significant figure)
1 x 1012
21. (0.000099999) (to 2 significant figure)
1.0 x 10-4
Solve the following, rounding at the end: (3 points each – total of 9 points)
22.
4
(83.24+19.00) 102.2 __

 10, 224  10, 220  1.022 104
(45.08  4508) 0.0100 0
__
23. (1.5 x 10-8) - (1.0 x 10-7)= -9 x 10-8
24.
4 .24
(8.9 1.60) 1 __

 1.4
(3.08  6.9) 9. 9 8
__
25. Lithium metal has a melting point of 453.7 K. Convert this to degrees Fahrenheit.
(5 points)
453.7 = 273.15 + °C °C = 180.55 °F = 1.80 x °C + 32 = 1.80 x 180.55 + 32 = 356.99
 357.0
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26. How many seconds are in a year? Use one significant figure. SHOW WORK! (6
points)
1year 
365days 24hr 60 min 60s



 3 107 s
1year 1day
1hr
1min
27. You come down with a nasty cough. Granny tells you to take her medicine
composed of secret ingredients. She says take 1 drop per 10 lbs. of body weight
per day divided into 4 doses until the coughing is gone. You weigh 98 kg. How
many drops per dose must you take? (2.206 lbs. = 1 kg) (8 points)
98kg 
2.206lbs
1drop
1day
5.4drops



1kg
10lbs  day 4doses
dose
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o
C + 273.15 = K
°F = 1.80 x °C + 32
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