Quiz 1

Quiz 1
Answer all questions on the scantron by filling in the bubble
completely. Scantrons will not be regraded.
1. Scientific theories are tested and validated with experimentation.
A)True B) False
2. The statement “ Osmium has a density of 22.9 g/cm 3 “ is an example of
A) law B) hypothesis C) theory D) observation
3.What is the standard SI unit for length?
A) mile B) centimeter C) foot D) meter E) none of the above
4. How many significant figures are in 0.00500670?
A) 3 B) 5 C) 6 D) 8 E) 9
5. Convert 3.23 x 10 3 to decimal notation.
A) 3.23 B) 32.3 C) 323 D) 0.00323 E) 3230
6. Rounded correctly, the product of: 2.000 cm X 10.0 cm is
A) 20.00 cm 2 B) 20.0 cm 2 C) 20 cm 2 D) 20.000 cm 2
E)none of the above
7. Rounded correctly, the result of: (23.1000 g - 22.0000 g) / (25.10 mL - 25.00 mL) is:
A) 11.00 g/mL B) 11 g/mL C) 11.000 g/mL D) 11.0 g/mL
E) none of the above
8. Total U.S farmland occupies 954 million acres. How many sq miles is this?
[1 acre = 43,560 ft 2 , 1 mi = 5280 ft]
A) 1.16 X 10 21 mi 2 B)1.49X10 6 mi 2 C)6.11X10 11 mi 2 D)7.87X10 9 mi 2
E) none of the above
9. Which of the following is a frequently used unit for the density of liquids and solids?
A) g/L B) g/kg C) kg/L D) cm 3 /mL E) g/cm 3
10. Calculate the mass of lead cube, which has a density of 11.4 g/mL and displaces 20.1 mL of
water?
A) 230 g B) 229 g C)229.2 g D) 1.76 g E) none of the above

11. The length of a piece of glass tubing is 0.525 m. How many inches long is the tubing?
[2.54 cm = 1 inch]
A) 0.0133 inches B) 0.207 inches C)20.7 inches D) 52.5 inches E)none of the
above
12. What is the density of a sample of mineral oil if 250 mL has a mass of 0.23 kg?
A) 0.0092 g/mL B)0.92 g/mL C)5.8 g/mL D)10.9 g/mL
E) none of the above
Quiz 2
PART A: MULTIPLE CHOICE
1. Which state of matter has indefinite shape and is compressible?
A) liquid
B) solid
C) gas
D) plasma
E) none of the above
2. A salt (NaCl) solution is an example of a (an)
A) pure substance
B) element
C) compound
D) homogeneous mixture
E) heterogeneous mixture
3. Which of the following items is a chemical property?
A) the paint color on a new red car
B) the odor of spearmint gum
C) the melting and boiling point
D) the tarnishing of a copper statue
E) none of the above
4. Convert 95.0 kWh to (food) Calories. ( 1 cal = 4.184 J and 1 kWh = 3.60 x 10 6 J.)
A) 8.17 x 10 3 Cal
B).8.17 x 10 4 Cal
C) 8.17 x 10 7 Cal
d) 1.43 x 10 7 Cal
E) 1.43 x 10 9 Cal
5. Which of the following elements will have the most similar chemical properties as
potassium?

A) Ca
B)Ar
C)Fe
D)Na
E)C
A) Electron
B) Neutron
C) Proton
D) two of the above
E) all of the above
6. Which of the following subatomic particles has the least mass?
7. The names of the elements whose symbols are Si, P, Mg, S are respectively:
A) silicon, potassium, magnesium, and sulfur
B) silver, phosphorus, magnesium, and sulfur
C) silicon, phosphorus, manganese, and sulfur
D) silicon, phosphorus, magnesium, and sulfur
E) silicon, phosphorus, magnesium, and sodium
8. Which one of the following is a period 3, group 4A metalloid?
A) B
B) Si
C) Ge
D) P
E) none of the above
9. The nucleus of a 19 9F atom contains:
A)19 protons and 19 electrons
B)19 protons and 0 electrons
C) 9 protons and 10 electrons
D) 19 protons and 19 neutrons
E) 9 protons and 10 neutrons
10. What is the symbol of an ion that has 12 protons and 10 electrons?
A) Si 2+
B) Si
C) Mg 2+
D) Ne
E) Ne 2–
11. How many electrons are in the bromide ion, Br – ?
A) 35
B) 36
C) 46
D) 70
E) 8
PART B : SHOW ALL WORK IN THE SPACES PROVIDED. USE UNITS AND
SIGNIFICANT FIGURES IN YOUR CALCULATIONS. CIRCLE YOUR FINAL
ANSWER.

1. Calculate the quantity of heat required to raise the temperature of a 250.0 mL cup of coffee by
75.1 o C. Density of coffee is 1.00 g/mL and specific heat of coffee is 4.184 J/g. o C.
2. Carbon has three naturally occurring isotopes: C-12 with mass 12.000 amu and a natural
abundance of 98.89%, C-13 with mass 13.004 amu and a natural abundance of 1.110%, and C-
14 which is negligibly small (assume 0% abundance). Calculate the atomic mass of carbon.
Quiz 3
Mark your choices on the scantron by filling in the bubbles clearly
using a pencil. Erase your changes completely. Scantrons cannot be
regraded. Write your name and section number on the scantron.
1. The limiting reactant is always the reactant with the least mass
A) True B) False
2. According to the following reaction, 2 moles of hydrogen gas react with one mole of oxygen
gas to produce 2 moles of water. 2H2 + O2 → 2H2O A) True B) False
3. Assuming that temperature and pressure are constant, the volume of a gas is inversely
proportional to the number of moles.
A) True B) False
4. At approximately room temperatures and pressures, real gases will follow the model of kinetic
molecular theory and behave as ideal gases.
A) True B) False
5. STP conditions are 273 K and 760 mm Hg.
A) True B) False
6. Determine the excess reactant for the reaction below, if you start with 10.0 g of Na and
10.0 g of Cl2?
2Na + Cl2 → 2NaCl
A) Na B) Cl2 C) NaCl D) both Na and Cl2 E) none of the above
7. Calculate the actual yield (in grams) of a reaction if 28.4 grams is the maximum amount
produced from a reaction that has 88.0% yield?
A) 25.0 B) 22.0 C) 3.52 D) 352 E) none of the above

8. All of the following statements are consistent with the kinetic molecular theory of gases
EXCEPT
A) The size of the gas molecules is negligible compared to the total volume of the gas.
B) Gases have a low density because there is so much empty space between the particles.
C) The gas molecules collide with each other and with the surfaces around them.
D) Strong attractive forces hold the gas molecules together.
E) Gases assume the shape and volume of their container because they are in constant, straightline
motion.
9. A 3.76 g sample of an inert gas is stored in a 2.00 L vessel at 874 torr and 25 °C. Calculate the
molar mass of the gas?
A) 4.00 B) 20.2 C) 40.0 D) 32.0 E) not enough
information
10. Oxygen gas reacts with powdered aluminum according to the following reaction.
4Al + 3O2 → 2Al2O3 Calculate how many liters of O2 gas, measured at 782 mm Hg and 25 o C, are required to
completely react with 64.8 g of Al?
A) 22.4 L B) 42.8 L C) 45.4 L D) 21.0 L E) not enough information
11. A sealed container contains 1.0 mol of hydrogen and 2.0 moles of nitrogen gas. If the total
pressure in the container is 1.5 atm, what is the amount of pressure exerted by each gas?

A) H2 = 1.0 atm and N2 = .50 atm B) H2 = 0.50 atm and N2 = 1.0 atm
C) H2 = 1.0 atm and N2 = 2.0 atm D) H2 = 2.0 atm and N2 = 1.0 atm
E) not enough information

Chem 25; W10_Lecture Quiz 1 Name______________________________________
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