Midterm Exam
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Which statement about subatomic particles is true?
a.
Protons, neutrons, and electrons all have about the same mass.
b.
Neutrons have no mass and no charge.
c.
An electron has far less mass than either a proton or neutron.
d.
Protons, neutrons, and electrons
Which statement about subatomic particles is not true?
a.
Protons and neutrons have almost the same mass.
b.
Protons and electrons have opposite charges.
c.
Unlike protons and electrons, neutrons have no charge.
d.
Protons and neutrons have the same charge.
The number of protons in one atom of an element is that element’s
a.
Mass number.
b. balanced charge.
c. atomic number.
d. isotope.
Which subatomic particle has a negative charge?
a.
Electron
b. Rinella particle
c. Neutron
d. Proton
The charge of an electron is
a. -2
b. -1
c. 0
d. +1
Atoms have no electric charge because they
a.
have an equal number of charged and uncharged particles.
b.
have neutrons in their nuclei.
c.
have an equal number of electrons and protons.
d.
have an equal number of neutrons and protons.
In an atomic model that includes the nucleus, positive charge is
a.
concentrated in the center of the atom.
b.
spread evenly throughout the atom.
c.
concentrated at multiple sites within the atom.
d.
located in the space outside the nucleus.
Which statement is true about oxygen-17 and oxygen -18?
a.
They do not have the same number of protons.
b.
Their atoms have identical mass.
c.
They are isotopes of oxygen.
d.
They have the same mass number.
Ionization refers to the process of
a.
changing from one period to another. c. turning lithium into fluorine.
b.
losing or gaining protons.
d. losing or gaining electrons.
Isotopes of an element have the same atomic _____________________
a. Number
11.
b. mass
c. density
d. nucleus
In Figure 1.2, assuming all the particles in the nucleus are visible, what are the atomic mass and
atomic number of the atom shown? (2 pts.)
a. Atomic mass=8, atomic #=17
b. atomic mass= 17, atomic #=8
_____12. Suppose scientists discovered four new elements (W, X, Y, Z) while studying
rock and soil samples brought back from a Mars mission. Which Lewis dot
structure represents an element that should be placed in column VIIA (17) of
the periodic table?
___ 13. Would you normally expect neon (Ne) to form compounds?
A. Yes, but neon is a rare gas and difficult to obtain.
B. No, neon needs six electrons to fill its outermost level.
C. Yes, neon needs six electrons to fill its outermost level.
D. No, neon has eight electrons in its outermost level and is stable.
Below is a phase change diagram for water. Lester started with a chunk of ice in a beaker with a thermometer in the
chunk; heated the ice until it all turned to water, then continued to heat the liquid water until it turned to a gas.
Temperature vs. Time (Phase Change for Water)
Temperature
(oC)
100
E
D
C
50
B
0
A
0
14.
15.
16.
17.
18.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Time (minutes)
Which letter represents liquid water?
Which letter represents a phase change from a liquid to a gas?
Which letter shows both a solid and a liquid at the same time?
Where on the graph would the molecules be moving the fastest?
Where on the graph would the energy be the lowest?
19. About how long is an ink pen in centimeters?
a. 143.5 cm
b. 14.35 cm
c. 1.435 cm
d. 0.1435 cm
20. What is the length of the paper clip above if the ruler is marked in centimeters?
a. 5 cm
b. 5.5 cm
c. 5.55 cm
d. 6 cm
21. What is the uncertainty of the above measurement?
a. oneth
b. tenth
c. hundreth
d. ten
22. Convert 5.25 meters into millimeters.
a. 52.5 mm
b. 5,250 mm
c. 0.00525 mm
d. 0.0525 mm
23. A tall center in basketball is 218cm (7ft. 2 in.) tall. What is his height in meters?
a. 2.18 m
b. 2180 m
c. 0.00218m
d. 21.8 m
24. The SI unit for measuring temperature is the
a. degree.
b. Kelvin.
c. mole
d. ampere
25. Which SI prefix means one-hundredth (1/100)?
a. nano-
b. micro-
c. milli-
d. centi-
26. The speed of light is approximately 3 x 108 m/s. How would this be written in conventional notation?
a. 300,000 m/s
b. 3,000,000 m/s
c. 30,000,000 m/s
d. 300,000,000 m/s
27. A precise measurement is one that
a. contains the correct number of significant figures for repeatability.
b. contains at least three significant figures.
c. is close to the true value.
d. is as exact as possible.
28. A measurement that is accurate is one that
a. is close to the true value.
b. contains at least four significant figures.
c. contains five decimal places.
d. none of the above.
29. In scientific notation, the number 46,500,000 would be written ____.
a. 46.5 x 106
b. 465 x 105
c. 0.0465 x 109
d. 4.56 x 107
30..Technology can best be defined as
a. science that uses computers.
c. applied science.
b. new inventions.
d. the use of lenses and microscopes.
31.A scientific theory is an explanation that
a. has been published in a journal or book.
b. predicts what will happen.
c. has been tested by many observations.
d. a scientist has tested with an experiment.
32.A scientific model is a
a. representation of a real event or object.
b. small building used to conduct experiments.
c. mathematical statement of a theory.
d. new theory that takes the place of an incorrect one.
33.Scientific theories can be changed or replaced when
a. new technology is invented.
b. new discoveries are made.
c. scientists decide to work on different problems.
d. scientists make models of events or objects.
34.A series of logical steps that is followed in order to solve a problem is called the
a. experimental process.
c. scientific method.
b. scientific theory.
d. model method.
35.The first step in the scientific method is usually
a. making an observation.
c. collecting data.
b. forming a hypothesis.
d. testing a hypothesis.
36.What does it mean to say that “no experiment is a failure”?
a. All experiments are observations of real events.
b. All experiments yield the desired results.
c. All experiments give scientists work to do.
d. All experiments involve manipulating variables.
37. Maria is 123 centimeters tall. Her height in meters is
a. 0123 m.
c.
b. 0.123 m.
d.
38. A loaf of bread weighs 1362 g. The weight in kilograms is
a. 1.362 kg.
c.
b. 1362 kg.
d.
1.23 m.
12.3 m.
01362 kg.
001362 kg.
39. At which time of day was the temperature approximately 5°C?
a. 9:00 A.M.
c. 11:00 A.M.
b. 10:00 A.M.
d. 12:00 P.M.
40. At which two times of day was the temperature the same?
a. 7:00 A.M. and 7:00 P.M.
c. 10:00 A.M. and 7:00 P.M.
b. 7:00 A.M. and 10:00 P.M.
d. 10:00 A.M. and 10:00 P.M.
41. The sample contained the same number of pennies for which two years?
a. 1988 and 1992
c. 1994 and 1997
b. 1988 and 1991
d. 1994 and 1998
42. For which year was the smallest number of pennies found?
a. 1988
c. 1990
b. 1989
d. 1991
43. The decimal equivalent of 102 is
a. 100.
c.
b. 10.
d.
44. What is 78,900,000,000 expressed in scientific notation?
a. 789  109
c.
9
b. 7.89  10
d.
0.1.
0.01.
7.89  1010
7.89  1011
45. What is the area of a room that is 4  102 cm long and 2  103 cm wide?
a. 6  103 cm2
c. 8  105 cm2
3
2
b. 8  10 cm
d. 8  107 cm2
46. Matter is defined as anything that
a. can be seen and touched.
c. can be weighed.
b. has mass and takes up space.
d. contains kinetic or potential energy.
47. The science of what matter is made of and how it changes is called
a. chemistry.
c. kinetics.
b. physics.
d. engineering.
48. A substance that cannot be broken down into simpler substances is
a. a compound.
c. an element.
b. a mixture.
d. an atom.
49. The smallest unit of a substance that behaves like the substance is
a. an element.
c. a molecule.
b. an atom.
d. a compound.
50. A molecule of water (H2O) is made from _____ combining two hydrogen atoms and one oxygen atom.
a. physically
c. thermally
b. ionically
d. chemically
51. .You put 1 gram of salt into 1 liter of water and stir. The resulting liquid is an example of
a. a pure substance.
c. a homogeneous mixture.
b. a heterogeneous mixture.
d. an immiscible mixture.
52. The chemical symbol for sulfuric acid is H2SO4. How many atoms are contained in each molecule of sulfuric acid?
a. 3
c. 6
b. 5
d. 7
53. How many oxygen atoms are in one molecule of table sugar (C12H22O11)?
a. 2
c. 12
b. 11
d. 22
54. A material that can be represented by a chemical formula is
a. an element.
c. a homogeneous solution.
b. a mixture.
d. a pure substance.
55. The chemical formula for water, H2O, means that each water molecule contains
a. two hydrogen atoms and two oxygen atoms.
b. two hydrogen atoms and one oxygen atom.
c. two hydrogen atoms and zero oxygen atoms.
d. one hydrogen atom and two oxygen atoms.
56. Which of the following is an example of a gas-liquid mixture?
a. the air we breathe
c. a helium balloon
b. a carbonated drink
d. ice cubes
57. Knowing the chemical properties of a substance will tell you how the substance
a. looks.
c. can be broken down into atoms.
b. smells.
d. reacts with other substances.
58. Which state of matter will hold its shape without a container?
a. solid
c. gas
b. liquid
d. plasma
59. A liquid changes rapidly into a gas at the liquid’s
a. boiling point.
c. melting point.
b. freezing point.
d. condensation point.
60. A physical property of gold is its
a. density.
c. non-flammability.
b. reactivity with powerful acids.
d. None of the above
61. Which of the following is not an example of a physical property?
a. freezing point
c. reactivity
b. boiling point
d. density
62. Lead has a density of 11.3 g/cm3 and a mass of 282.5 g. What is its volume?
a. 2.5 cm3
c. 250 cm3
b. 25 cm3
d. 2500 cm3
63. A substance has a mass of 360 g and a volume of 7.5 cm3. What is its density?
a. 2700 g/cm3
c. 480 g/cm3
3
b. 270 g/cm
d. 48 g/cm3
64. Which of the following is an example of a physical change?
a. dissolving salt in water
c. cooking an egg
b. burning wood into charcoal
d. rusting iron
65. Grinding quartz crystals down to produce sand is an example of a
a. change of state.
c. chemical reaction.
b. chemical change.
d. physical change.
66. .Digesting food by a hydrochloric acid reaction in the stomach is an example of
a. physical change.
c. chemical change.
b. change of state.
d. buoyancy.
67. Which of the following is an example of chemical change?
a. strumming a guitar
c. grilling a burger
b. converting matter into energy
d. melting of copper
68. Which of the following is not a potential sign of chemical change?
a. release of gas
c. change of color
b. evaporation of water
d. production of gas
69. Temperature is a measure of the average _____ energy of the particles in the object.
a. thermal
c. potential
b. kinetic
d. chemical
70. The process of a liquid becoming a gas is called
a. sublimation.
c. evaporation.
b. condensation.
d. freezing.
71. The process of a liquid becoming a solid is called
a. condensation.
c. evaporation.
b. freezing.
d. melting.
72. The only state of matter that is not a fluid is
a. water.
c. liquid.
b. gas.
d. solid.
73. Which state of matter has a definite volume, but not shape?
a. plasma
c. liquid
b. gas
d. solid
74. The heavier a particle, the _____ it moves.
a. slower
c. less
b. faster
d. more
75. What determines the speed of the atoms and molecules of a particular substance?
a. size of the atoms and molecules
c. Both (a) and (b)
b. temperature of the substance
d. None of the above
76. When ice melts to form water, energy
a. is created.
c. is released.
b. is destroyed.
d. is absorbed.
77. The kinetic theory states that the higher the temperature, the faster the
a. particles that make up a substance move.
b. bonds between atoms break down.
c. molecules of gas rush together.
d. lighter particles within a substance clump together.
78. Evaporation refers to the change of state from a
a. liquid to a gas.
c. solid to a liquid.
b. gas to a liquid.
d. liquid to a solid.
79. The law of conservation of mass states that mass cannot be
a. burned.
c. created or destroyed.
b. changed in form.
d. heated or cooled.
80. Ice floats in water because it is
a. more dense than water.
c. colder than water.
b. less dense than water.
d. warmer than water.
81. Which statement about the atomic nucleus is correct?
a. The nucleus is made of protons and neutrons and has a negative charge.
b. The nucleus is made of protons and neutrons and has a positive charge.
c. The nucleus is made of electrons and has a positive charge.
d. The nucleus is made of electrons and has a negative charge.
82. The order of elements in the periodic table is based on
a. the number of protons in the nucleus.
c. the number of neutrons in the nucleus.
b. the electric charge of the nucleus.
d. atomic mass.
83. Atoms of elements that are in the same group have the same number of
a. protons.
c. valence electrons.
b. neutrons.
d. protons and neutrons.
84. Valence electrons determine an atom’s
a. mass.
c. electric charge.
b. chemical properties.
d. period.
85. Oxygen’s atomic number is 8. This means that an oxygen atom has
a. eight neutrons in its nucleus.
c. eight protons in its nucleus.
b. a total of eight protons and neutrons.
d. a total of eight neutrons and electrons.
86. An atom’s mass number equals the number of
a. protons plus the number of electrons.
c. protons.
b. protons plus the number of neutrons.
d. neutrons.
midterm
Answer Section
MULTIPLE CHOICE (starts at # 30)
1. ANS:
OBJ:
2. ANS:
OBJ:
3. ANS:
OBJ:
4. ANS:
OBJ:
5. ANS:
OBJ:
6. ANS:
OBJ:
7. ANS:
OBJ:
11. ANS:
OBJ:
12. ANS:
OBJ:
13. ANS:
OBJ:
14. ANS:
OBJ:
15. ANS:
OBJ:
16. ANS:
OBJ:
17. ANS:
OBJ:
18. ANS:
OBJ:
20. ANS:
OBJ:
C
2
C
3
A
4
B
3
C
1
A
2
A
2
C
5
A
5
B
1
D
1
C
1
D
1
D
2
C
2
C
2
PTS: 1
23. ANS:
OBJ:
24. ANS:
OBJ:
25. ANS:
OBJ:
26. ANS:
OBJ:
27. ANS:
OBJ:
B
1
A
1
C
2
C
3
D
3
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
DIF: 1
1
DIF: 1
SWK.5 | SWK.6 | SWK.7
1
DIF: 1
SI.3
1
DIF: 1
SWK.5 | SWK.6 | SWK.7
1
DIF: 1
SI.6
1
DIF: 1
REF: 1
REF: 1
REF: 1
REF: 1
REF: 2
REF: 2
PTS: 1
DIF: 2
REF: 2
PTS: 1
DIF: 2
REF: 2
PTS: 1
DIF: 2
REF: 2
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
DIF: 2
REF: 3
DIF: 2
REF: 3
DIF: 2
REF: 3
DIF: 2
REF: 3
DIF: 2
REF: 3
DIF: 2
REF: 3
DIF: 2
REF: 3
PTS: 1
DIF: 1
REF: 1
PTS: 1
DIF: 1
REF: 1
PTS:
STA:
PTS:
STA:
PTS:
STA:
DIF: 1
REF: 1
DIF: 1
REF: 1
DIF: 1
REF: 1
1
SI.5
1
SI.5
1
SI.5
1
SI.5
1
SI.4
1
SI.4
1
SI.4
1
PS.7
1
PS.7
1
PS.7
28. ANS:
OBJ:
29. ANS:
OBJ:
30. ANS:
OBJ:
31. ANS:
OBJ:
32. ANS:
OBJ:
33. ANS:
OBJ:
34. ANS:
OBJ:
35. ANS:
OBJ:
36. ANS:
OBJ:
37. ANS:
OBJ:
38. ANS:
OBJ:
39. ANS:
OBJ:
40. ANS:
OBJ:
41. ANS:
OBJ:
42. ANS:
OBJ:
43. ANS:
OBJ:
44. ANS:
OBJ:
45. ANS:
OBJ:
46. ANS:
OBJ:
47. ANS:
OBJ:
48. ANS:
OBJ:
49. ANS:
OBJ:
50. ANS:
OBJ:
51. ANS:
OBJ:
C
5
D
4
B
4
D
5
B
4
B
5
D
1
A
1
A
1
A
1
C
1
B
2
D
2
A
1
D
1
C
2
C
2
B
4
B
2
C
4
B
4
D
3
C
3
A
1
PTS: 1
STA: PS.9
PTS: 1
DIF: 1
REF: 1
DIF: 2
REF: 1
PTS: 1
DIF: 1
REF: 1
PTS: 1
STA: PS.9
PTS: 1
DIF: 1
REF: 1
DIF: 1
REF: 1
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
DIF: 1
REF: 1
DIF: 1
REF: 2
DIF: 1
REF: 2
DIF: 1
REF: 2
DIF: 1
REF: 2
DIF: 1
REF: 2
DIF: 2
REF: 2
DIF: 2
REF: 2
DIF: 1
REF: 3
PTS: 1
DIF: 1
REF: 3
PTS: 1
DIF: 1
REF: 3
PTS: 1
DIF: 2
REF: 3
PTS: 1
DIF: 2
REF: 3
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
DIF: 1
REF: 1
DIF: 1
REF: 1
DIF: 1
REF: 1
DIF: 1
REF: 1
PTS: 1
DIF: 1
REF: 1
PTS: 1
STA: PS.11
DIF: 1
REF: 1
1
PS.9
1
PS.9
1
PS.9
1
PS.9
1
PS.9
1
PS.9
1
PS.9
1
PS.9
1
1
PS.11
1
PS.11
1
PS.11
1
52. ANS:
OBJ:
53. ANS:
OBJ:
54. ANS:
OBJ:
55. ANS:
OBJ:
56. ANS:
OBJ:
57. ANS:
OBJ:
58. ANS:
OBJ:
61. ANS:
OBJ:
62. ANS:
OBJ:
63. ANS:
OBJ:
64. ANS:
OBJ:
65. ANS:
OBJ:
C
1
D
5
A
1
A
4
C
5
B
3
B
2
A
1
C
1
B
1
C
3
B
3
PTS: 1
STA: PS.11
PTS: 1
DIF: 1
REF: 1
DIF: 1
REF: 1
PTS:
STA:
PTS:
STA:
PTS:
DIF: 1
REF: 1
DIF: 1
REF: 1
DIF: 1
REF: 1
PTS: 1
DIF: 1
REF: 2
PTS: 1
DIF: 1
REF: 1
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
DIF: 1
REF: 2
DIF: 1
REF: 2
DIF: 1
REF: 2
DIF: 2
REF: 2
DIF: 1
REF: 2
1
PS.11
1
PS.11
1
1
PS.4
1
PS.4
1
PS.4
1
PS.1 | PS.2
1
PS.1 | PS.2