CHEM 1405 Practice Comprehensive Final Exam and Answer Keys.
Corwin’s Introductory Chemistry
PART I – Multiple choice (3 points each).
Do NOT mark on the test. Write your name and answers in Scantron.
1. Round off the following measurement to the four significant digits: 107.300 g
A) 107 g B) 107.0 g C) 107.3 g D) 107.5 g
2. Add 7.7 g to 51.65 g and round off the sum to the proper significant digits
A) 59.0 g B) 59.4 g C) 59.43 g D) 59.44 g
3. Express 0.000000000010 as an exponential number.
A) 1.0 X 10–10 B) 1.0 X 10–12 C) 1.0 X 10–11 D) 1.0 X 1012
4. Which of the following unit factors is derived from: 1 foot = 12 inches?
A) 12 feet/ 12 inches B) 12 inches/ 12 feet C) 1 foot/ 12 inches D) 1760 yard/ 1 mile
5. The radius of a tin atom is 1.41 X 10–8 cm. What is the radius in meters? Given 1m = 102 cm
A) 1.41 X 10–16m B) 1.41 X 10–10m C) 1.41 X 10–4m D) 1.41 X 10–1m
6. A glass cylinder contains four separate liquid layers: chloroform (d = 1.49 g/mL), acetic acid (d
= 1.05 g/mL), ether (d = 0.708 g/mL). If a stone (d = 1.30 g/mL) is added to the cylinder, where
does it come to rest?
A) On bottom of the chloroform layer B) On top of chloroform layer
C) On top of acetic acid layer D) On the top of ether layer
7. How much energy is released when a 50.0 g sample of solid aluminum was cooled from
100.0°C to 60.0°C. The specific heat of the metal is 0.210 cal/(g°C).
A) 168.0 calories B) 210.0 calories C) 840.0 calories D) 420.0 calories
8. What is the equivalent temperature, in Kelvin, for –103°C?
A) –367 K B) –179 K C) –94 K D) 170 K
9. Which of the following elements is an example of a semimetal?
A) He B) Ca C) Cr D) Si
10. Use the periodic table and predict which of the following elements a liquid at 25°C.
A) Bi B) S C) Hg D) Ar
11. How many neutrons are in the nucleus of one atom of sulfur–31?
A) 15 B) 16 C) 18 D) 31
12. What is the maximum number of electrons that can occupy a 3p sublevel?
