CHEM 1305
Exam # 1 (Chap. 1- 4)
Name:_____________________
Score:
PART I – Multiple choice : (3 points each)
-------1. Perform the following calculations and round off the answers to proper significant
Figures:
9.82 ml + 10.0 ml + 9.980 ml =
A) 29
B) 29.8
C) 29.80
D) 29.800
-------2. Three nanometers are equal to how many centimeters (cm)?
A) 3.00 x 10–7cm
B) 3.00 x 10–9cm
–11
C) 3.00 x 10 cm
D) 3.00 x 109cm
-------3. Convert 12.5 ft to cm (1in = 2.54 cm, 1ft = 12in).
A) 45 cm
B) 2.9 x 102 cm
C) 381 cm
D) 289.56 cm
-------4. The melting point of antimony is 630 oC. What is it on the Fahrenheit scale?
A) 1166 oF
B) 621 oF
C) 2032 oF
D) 3504 oF
-------5. A 247.5 g sample of an organic compound is found to occupy a volume of 250 ml.
What is its density?
A) 0.8
B) 0.99
C) 0.788
D) 1.00
------6. What is the term for the methodical exploration of nature and the logical explanation of
the observations?
A) Alchemy
B) Chemistry
C) Experiment
D) Science
-------7. Which of the following is the basic step in the scientific method?
A) Perform an experiment and collect data.
B) Analyze experimental data and propose a hypothesis
C) Test a hypothesis and state a theory or law.
D) All of the above.
-------8. What subject is said to be at the crossroads of Biology, Physics and Geology?
A) Biochemistry
B) Chemistry
C) Environmental Chemistry
D) Geochemistry
-------9. Which of the following is a branch of chemistry?
A) Analytical Chemistry
B) Environmental Chemistry
C) Physical Chemistry
D) All of the above
-------10. Which of the following statements is a scientific theory?
A) Atoms contain protons, neutrons, and electrons.
B) Equal volumes of gases contain the same number of molecules.
C) The energy of two gas molecules is the same before and after a collision.
D) All of the above.
-------11. Which of the following is an example of chemical property?
A) Density
B) ductile
C) electrical conductivity
-------12. According to the Metric system, 1s = 1x 109 --------?
A) Gs
B) ds
C) ns
D) Flammability
D) ks
-------13. If the density of methyl alcohol is 0.813g/mL, which of the following is a related unit
Factor?
A) 1g/1mL
B) 1g/1mL
C) 0.813g/1mL
D) 0.813g/0.813mL
-------14. A piece of tin foil has a volume of 0.645 mm3. If the sheet measures 10.0 mm by
12.5mm, what is the thickness of the foil?
A) 0.000516 mm
B) 0.00516 mm
C) 0.0516 mm
D) 80.6 mm
-------15. What is the term for the property of a metal to be hammered into a foil?
A) Alloy
B) Ductile
C) Malleable
D) Tensile
-------16. What is the term for an element that is generally dull, has a low density, and is a poor
Conductor of heat and electricity?
A) Metal
B) Non-metal
C) Semimetal
D) All of the above
-------17. Which of the following is a form of energy?
A) Chemical B) Electrical
C) Mechanical
D) All of the above
-------18. What happens to the kinetic energy of a particle when a gas is heated?
A) Kinetic energy decreases
B) Kinetic energy increases
C) Kinetic energy remains constant
D) Depends on the gas.
-------19. How many kilocalories of heat are required to raise 250.0 g of water from 20.00 C to
750C?
A) 0.220 kcal B) 4.55 kcal
C) 5.00 kcal
D) 13.8 kcal
-------20. Which of the following exists as charged particles at high temperatures?
A) Gas
B) Liquid
C) Solid
D) Plasma
PART II – Show your work.
21. Perform the following metric-metric conversions.
a) 0.388 Mm to m
b) 10.6 ng to g
c) 125mL to L
d) 100 ns to s
22. If the sun is 93,000,000 miles from Earth, how long does it take for sunlight to reach the
earth? (Given: The velocity of light is 186,000 miles per second.)
Unit Equation:
Two Unit Factors:
Unit Analysis Solution:
23. Add, subtract or multiply the following and round off the answer:
4 cm+ 16.3 cm+ 0.95 cm =?
24.90 g- 0.550 g =?
5.15 cm x 2.55cm x 1.1cm =?
9.95 cm / 0.15 cm =?
24. Ordinary table salt, sodium chloride, is composed of 39.3% sodium and 60.7% chlorine.
Calculate the mass of sodium in 0.375g of salt.
25. Calculate the volume in milliliters for each of the following solids:
a)1.00 kg of iron ( d = 7.87g/cm3)
b) 1.00 kg of titanium (d = 4.51 g/cm3
BONUS QUESTION – Show all your work. (10 points)
26. A plastic bottle contains 5.00 gallons of distilled water. How many liters of distilled water
are in the bottle?