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WCU - CHEM 280 - Week 1 Quiz Study Guides

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Sandra Watson
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West Coast University  – CHEM 280 – Week 1 Quiz Study Guides

1. Which of the following is not a pure substance? (1 pt.)
a) nitrogen gas
b) air

c) iron

d) sodium chloride

2. An example of a chemical property of formaldehyde (CH2O) is (1 pt.)
a) It is a colorless gas.
b) It has a density of 0.815 g/ml.
c) It is corrosive.
d) It dissolves in alcohol.

3. Which of the following is a physical change? (1 pt.)
a) An iron nail rusts.
b) Mixing vinegar and solid baking soda produces bubbles.
c) Dry ice sublimes at room temperature.
d) Methane gas combusts in the presence of oxygen gas.

4. Which of the following terms is most appropriate when classifying a pepperoni pizza? (1 pt.)
a) pure substance c) heterogeneous mixture
b) compound

c) heterogeneous mixture

d) homogeneous mixture

5. Saltpeter is a mineral found in many parts of the world. A sample of saltpeter taken from anywhere
in the world has a composition 38.7% K, 13.9% N, and 47.4% O. Based on this, it can be concluded
that saltpeter is (1 pt.)
a) an element.           c) a heterogeneous mixture.
b) a compound.        d) a homogenous mixture

6. How many significant figures are in each of the following
numbers? (4 pts.)
a) 3.1400 ____ c) 0.0006042 ____
b) 45,300 ____ d) 0.04560700 ____

7. A flask contains 145.675 ml of saline solution. If 24.2 ml of the saline solution are withdrawn from
the flask, how should the volume of the saline solution that remains in the flask be reported (to the
proper number of significant figures)? (1 pt.)
a) 121.475 ml d) 121 ml
b) 121.48 ml e) 122 ml
c) 121.5 ml

8. Carry out the following calculation and report the answer using the proper number of significant
figures: (1 pt.)

a) 31.0185 ft/s               d) 31.0 ft/s
b) 31.01 ft/s                    e) 31 ft/s
c) 31.02 ft/s

9. A typical red blood cell has a diameter of 7.50 x 10-6 m. What is the diameter of a typical red blood cell in mm? (2 pts.)
10. How many liters are contained in a 67.6 ounce soft-drink bottle? (1.00 ounce = 29.6 ml) (3 pts.)
11. How many miles are covered in a 15 km race? (1 mile = 5280 feet, 12 inches = 1 foot, 1 inch = 2.54 cm) (5 pts.)

12. If a 185-lb patient is prescribed 145 mg of the cholesterol-lowering drug Tricor daily, what dosage is the patient receiving in mg/kg of body mass? (1 pound = 454 grams) (3 pts.)
13. 1.5 L of normal saline solution is required to be given over 4 hours. If the IV at the hospital delivers 10 drops per ml, calculate the drip rate-in drops per minute-that the patient needs to be given. (4 pts.)

14. Ray Bradbury chose Fahrenheit 451 as the title of his novel about book burning in the future because that’s the temperature at which paper ignites. What would his title been in degrees Celsius and in Kelvin? (2 pts.)

15. An irregularly shaped object has a mass of 66.12 grams. When it is placed in a graduated cylinder containing 12.5 ml of water, the water level rises to 22.7 ml. Calculate the density of this object. (3 pts.)
16. Record the volume of water in the graduated cylinder with the proper number of significant figures. (1 pt.)

Skip Next Questions

17. Which element is a nonmetal? (1 pt.)
a) K
b) Co
c) Ga
d) Br
e) Al

18. _____ is the symbol of the element Group 5A and period 3. (1 pt.)
19. Is Ge a metal, nonmetal, or metalloid?________________

20. Which element is chemically similar to lead? (1 pt.)

a) Bi
b) Zr
c) Tl
d) Sn
e) I

21. How many protons, neutrons and electrons are in the following
isotope? (3 pts.)

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