SBVC CHEM 101 Dr. Lemieux
.Name:______________________________________________
CHEMISTRY 101 Practice Exam #1 – 100 points
#1: Multiple Choice __________/ 60
#2: Free Response __________/ 40
TOTAL: __________/100
Instructions:
1. Cell phones must be put away and bags punt on the floor.
2. Once we begin the exam, you must ask Dr. Lemieux if you wish to leave and return. 3. Anyone caught cheating in any fashion will be disciplined, as indicated in the syllabus. 4. You will have 1 hr 15 min to complete this exam individually.
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Name________________________ Student ID #__________________________
Multiple Choice Section (3 points each, 20 questions)
1. When a substance undergoes a chemical change it is always true that A) it liquifies
B) a solid is formed
C) the substance is converted into a different substance D) the temperature of the substance increases
2. The description “two substances present, two phases present” is correct for A) heterogeneous mixtures.
B) homogeneous mixtures. C) elements.
D) compounds.
3. Which of the following statements is correct?
A) Elements, but not compounds, are pure substances. B) Compounds, but not elements, are pure substances. C) Both elements and compounds are pure substances. D) Neither elements nor compounds are pure substances.
4. In which of the following sequences of elements do each of the elements have a two-letter chemical symbol?
A) calcium, palladium, oxygen B) selenium, gold, barium C) tin, gold, phosphorus D) iodine, lithium, titantium
5. Consider the chemical formulas CoI2 and COI2. It is true that they
A) contain the same kinds of atoms B) identify the same compound
C) contain different kinds and numbers of atoms D) are the same heteroatomic compound
6. Which of the following best describes a theory in science?
A) a predictive explanation based on data from varied experiments
B) a tentative interpretation or explanation of observations from an experiment C) brief statement that synthesizes past observations
7. In which of the following cases is the given number correctly rounded to three significant figures?
A) 694,000 becomes 694 B) 0.09145 becomes 0.0914 C) 78.16 becomes 78.2 D) 57.200 becomes 57,200
8. The number 1492 expressed in scientific notation becomes
A) 3
0.1492 10
B) 2
1.492 10
C) 4
1.492 10
D) 3
1.492 10
9. The correct answer obtained from adding the measurements 7.7, 1.28 and 3.157 contains A) 2 significant figures
B) 3 significant figures C) 4 significant figures D) 5 significant figures
10. The correct answer obtained by dividing the measurement –3
5.33 10 by the
measurement 2
1.34 10 is
A) –5
0.40 10
B) –5
3.99 10
C) –6
3.99 10
D) –4
3.99 10
11. If object A weighs 4.0 grams and has a volume of 2.0 mL and object B weighs 6.0 grams and has a volume of 1.50 mL,
A) B is less dense than A
B) A and B have equal densities C) B is twice as dense as A D) B is four times as dense as A
12. All of the following compounds are soluble in water EXCEPT: A) NaCl.
B) CaCl2.
C) FeCl3.
13. The nucleus of an atom A) contains only neutrons
B) has no charge because of the presence of neutrons C) has no mass
D) does not account for a large amount of the total volume of an atom
14. Atoms are neutral because A) all atoms contain neutrons.
B) all subatomic particles lose their charges once they enter an atom. C) equal numbers of protons and electrons are present.
D) the number of subatomic particles in the nucleus is always an even number.
15. Isotopes of a given element
A) have the same mass number but different numbers of protons. B) have different mass numbers but identical numbers of protons. C) have the same atomic number but different chemical properties. D) have the same mass number but different chemical properties.
16. A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of:
A) iron(III) chloride. B) potassium chloride. C) magnesium chloride. D) barium chloride. E) none of the above
17. Which substance is oxidized in the following redox reaction? Sb2O3 + 3Fe ↔ 2Sb +3FeO
A) Sb2O3
18.
Which of the following statements is correct for 14 27Si?
A) atomic number = 27 and mass number = 14 B) contains 14 protons and 27 neutrons
C) contains an equal number of protons and electrons D) more than one correct response
E) no correct response
19. Which of the following statements correctly characterizes the subatomic particle called a neutron?
A) its mass is half that of a proton B) it has a negative charge
C) it is found in the nucleus
D) it does not contribute to the mass of an atom
20. Which of the following elements is a halogen? A) nitrogen
Free Answer Section (40 points)
21.Fill in the following table (4 points)
Ion
Symbol
Protons
Electrons
Neutrons
16
O
2-12
12
13
39
K
24
21
28
21.Name the following compounds (4 points)
a. CuSO4 _____________________________________
b. Fe3(PO4)2 ___________________________________
c. N2O5 ______________________________________
d. Ag2S ______________________________________
22.Write the chemical formula (4 points)
a. Copper (III) hydroxide _____________________________
b. ammonium nitrate ________________________________
c. strontium perchlorate ______________________________
d. boron trichloride __________________________________
23.A patient weighs 132.5 pounds. The dosage for a medicine is 3.40 mg medicine/ kg body
weight. The medicine is in a solution with 80.0 mg medicine per mL solution. How
24. A student weighs a graduated cylinder and finds the mass is 125.81 grams. The student puts 10.0 mL of an unknown liquid in the cylinder. The mass of the cylinder with the liquid is 164.13 grams. What is the density of the liquid? (8 points)
25.Balance the following equations (4 points)
a. ____ Mg + ____ SiO2 ____ MgO + ____ Si
b. ____ NO + ____ O2 ____ NO2
c. ____ Na + ____ ZnSO4 ____ Na2SO4 + ____ Zn
d. ____ C6H6 + ____ O2 ____ H2O + ____ CO2
26.Complete the following chemical reactions. Be sure to indicate phases (s, aq, etc.) and
balance the equation.(8 points)
a) Na3PO4 (aq) + CaCl2 (aq)
