St. Croix Educational Complex High School
Honors Chemistry Midterm Examination
1st Semester SY 2018-19
Student’s Name:
Period: 4th
Date:
Teacher: Mrs. Nurse
Score: __________/ 100 x 100% = __________%
Section
I.
Multiple Choice
II.
Completion
III.
Matching
IV.
Calculations
V.
Short Answer
No. of test items
42
31
5
19
3
Total Points
Total points
42
31
5
19
3
100
Earned points
_______
_______
_______
_______
_______
100
_______
Comments:
__________________________
_________________
Chairperson’s signature
Date
__________________________
_________________
Principal’s signature
Date
[ ]approved
[ ]disapproved
[ ]approved
[ ]disapproved
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1
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42._________________________________
46. _________________________________
43._________________________________
47. _________________________________
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48. _________________________________
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50._________________________________
59. _________________________________
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53. _________________________________
62.
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67.
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68 a._____________________________________b.__________________________________
69 a._____________________________________b.__________________________________
70._____________________________
71 a._____________________________________b.__________________________________
72._________________________________
76. _________________________________
73._________________________________
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78. _________________________________
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79. _________________________________
80. _________________________________
81._______________________________________________________________________________________
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82._______________________________________________________________________________________
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83._______________________________________________________________________________________
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84. Complete the table below by filling in the spaces with correct names or symbols.
Name of element
Aluminum
Symbol of element
Ca
Mn
Nickel
Potassium
Cobalt
Ag
H
85. Show Work Here:
86. Show Work Here:
a.
b.__________________________
c.
87._________________________________
94. _________________________________
88._________________________________
95. _________________________________
89. _________________________________
96. _________________________________
90._________________________________
97. _________________________________
91. _________________________________
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92._________________________________
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100. _________________________________
Honors’ Chemistry Midterm 2018
In the space provided, choose the letter of the term or phrase that best completes each statement or
best answers each question.
_____ 1. A scientist is working in the lab, with compounds containing carbon. She is most likely working
in the field of
a. inorganic chemistry.
b. theoretical chemistry.
c. organic chemistry.
d. None of the above
_____ 2. The branch of chemistry called analytical chemistry most likely would be used in determining
the
a. economic effects of a new substance.
b. chemical composition of a new substance.
c. effect of a chemical compound on living things.
d. uses of a particular metal.
_____ 3. A scientist is working with mathematical and computer models to learn about the principles at
work in a chemical reaction. He is working in the field of
a. theoretical chemistry.
b. physical chemistry.
c. biochemistry.
d. analytical chemistry.
_____ 4. Research that is carried out for the sake of increasing knowledge, such as research into the
properties of a substance, is considered to be
a. applied research.
b. basic research.
c. technological development.
d. None of the above
_____ 5. A scientist is working to improve a product that uses fiber optics. This is an example of
a. applied research.
b. basic research.
c. technological development.
d. Both (a) and (c)
_____ 6. To find a safer chemical for industrial purposes, a scientist is working with chemicals that do not
cause depletion of ozone in the atmosphere. This is an example of
a. applied research.
b. basic research.
c. technological development.
d. None of the above
_____ 7. The smallest unit of matter that retains the properties of that matter is
a. a molecule.
b. a compound.
c. a mixture.
d. an atom.
_____ 8. Which statement best describes an element?
a. any combination of two or more atoms of different types
b. a pure substance made up of only one kind of atom
c. a substance containing only carbon atoms
d. any kind of crystal
_____ 9. Which of the following is an extensive property of matter?
a. boiling point
b. density
c. volume
d. melting point
_____ 10. Which of the following is an intensive property of matter?
a. energy content
b. density
c. volume
d. mass
_____ 11. Which of the following changes is a physical change of matter?
a. water evaporating
b. paper burning
c. a nail rusting
d. a silver spoon tarnishing
_____ 12. Which state of matter is composed of atoms that have lost many of their electrons?
a. solid
b. liquid
c. gas
d. plasma
_____ 13. Technological development of a chemical product often.
(a) lags behind basic research on the same substance.
(b) does not involve chance discoveries.
(c) is driven by curiosity.
(d) is done for the sake of learning something new.
. _____ 14. The primary motivation behind basic research is to
(a) develop new products.
(b) make money.
(c) understand an environmental problem.
(d) gain knowledge.
_____15. Applied research is designed to
(a) solve a particular problem.
(b) satisfy curiosity.
(c) gain knowledge.
(d) learn for the sake of learning.
_____ 16. Chemistry is usually classified as
(a) a biological science.
(b) a physical science.
(c) a social science.
(d) a computer science
_____ 17. In an experiment, onion plants of different ages were exposed to various amounts of caffeine to
determine the effect of caffeine on cell growth. Temperature, amount of water, and light were
kept constant. Which of these statements about the experiment is definitely true?
a. The results may not be valid because there were two variables.
b. The amount of caffeine used was a control.
c. Temperature, water, and light were the only variables.
d. Onion plants can be used to model the effects of caffeine on living things.
_____ 18. Which of these is the variable in an experiment designed to determine whether steel rusts more
quickly near a lake or in a desert in one year?
a. amount of rust
b. time of exposure
c. amount of water in the air
d. mass of the steel
_____ 19. Which of these recorded observations is qualitative, rather than quantitative?
a. A chemical reaction is complete in 2.3 s.
b. The solid has a mass of 23.4 g.
c. The compound melts at 87.5C.
d. Iron is denser than aluminum.
_____ 20. Which of these terms best describes the following statement? “A solution of the unknown
compound turned litmus paper blue.”
a. hypothesis
b. model
c. quantitative observation
d. qualitative observation
_____ 21. Which of these statements is true of the scientific method?
a. The steps may vary somewhat to suit the experiment.
b. Working scientists rarely use it.
c. Scientists must follow its steps exactly.
d. Scientists rarely publish results of experiments.
_____ 22. Theories are considered successful only if they
a. can be used to make accurate predictions.
b. can be stated in simple terms.
c. can be written in the form of an equation.
d. have been accepted by all scientists.
_____ 23. An experiment is designed to measure the effect of global temperature increase on ocean levels.
In this experiment, if the ocean level is compared to the average ocean level over the last 100
years, then the average ocean level over the last 100 years would be considered
a. a model.
b. a variable.
c. the hypothesis.
d. the control.
_____ 24. The unit cm3 is used to express
a. length.
b. mass.
c. volume.
d. time.
_____ 25. The SI base units for time and temperature are
a. hour and degree Celsius.
b. second and degree Celsius.
c. hour and kelvin.
d. second and kelvin.
_____ 26. Which of these shows SI unit prefixes arranged in order from smallest to largest?
a. centi, milli, kilo
b. milli, centi, kilo
c. kilo, milli, centi
d. kilo, centi, milli
_____ 27. The conversion factor
a.
b.
c.
d.
1 L would be used to change
10 3 mL
milliliters to liters.
liters to milliliters.
units of volume to units of length.
units of length to units of volume.
_____ 28. A sample of bismuth has a mass of 343 g and a volume of 35.0 cm3 . What is the density of
bismuth?
a. 0.102 g/cm3
b. 9.80 g/cm3
c. 378 g/cm3
d. 1.20  104 g/cm3
_____ 29.Which of these statements about density is true?
a. Density is proportional to the amount of a substance.
b. Density is expressed in units of mL/cm3 .
c. Density does not change with temperature.
d. Density may be used to help identify a material.
_____ 30. An object’s weight is a measure of
a. the force with which it is attracted by gravity.
b. the pressure exerted on a scale.
c. the amount of material per unit volume.
d. the force causing the object to move.
_____ 31. The SI base unit for mass is the
a. gram.
b. cubic centimeter.
c. meter.
d. kilogram.
_____ 32. Which of these is not an SI base unit?
a. meter
b. pound
c. kelvin
d. ampere
_____ 33. Precision is related to all of these except
a. reproducibility of measurements.
b. range of measurement values.
c. number of significant figures.
d. closeness of a measurement to the accepted value.
_____ 34. A student determined the density of aluminum by averaging the results of three density
calculations. Each value was different, but the average was equal to the accepted value for
aluminum’s density. The results of this investigation are best described as
a. accurate, but not precise.
b. precise, but not accurate.
c. both precise and accurate.
d. neither precise nor accurate.
_____ 35. The measurement 0.0265 g, rounded off to two significant figures, would be
a. 0.026 g.
b. 0.027 g.
c. 0.03 g.
d. 0.030 g.
_____ 36. .In division and multiplication, the answer should have the same number of significant figures as
the
a. number in the calculation with the fewest significant figures.
b. number in the calculation with the most significant figures.
c. average number of significant figures in the calculation.
d. total number of significant figures in the calculation.
_____ 37. The number of significant figures in the measurement 170.040 km is
a. three.
b. four.
c. five.
d. six.
_____ 38. The dimensions of rectangular solid are measured to be 1.27 cm,
1.3 cm, and 2.5 cm. The volume should be recorded as
a. 4.128 cm3 .
b. 4.12 cm3 .
c. 4.13 cm3 .
d. 4.1 cm3 .
_____ 39. Samples with masses of 0.12 g, 1.8 g, and 0.562 g are mixed together. The combined mass of the
three samples, expressed to the correct number of significant figures, should be recorded as
a. 2.4 g.
b. 2.48 g.
c. 2.482 g.
d. 2.5 g.
_____ 40. Expressed in scientific notation, 0.0930 m is
a. 93  10 3 m.
b. 9.3  10 3 m.
c. 9.30  10 2 m.
d. 9.30  10 4 m.
_____ 41. When 6.02  102 3 is multiplied by 9.1  10 3 1 , the product is
a. 5.5  10 8 .
b. 5.5  105 5 .
c. 5.5  10 7 .
d. 5.5  10 5 3 .
For each of the following types of chemical investigations, determine whether the investigation is
basic research, applied research, or technological development. More than one choice may apply.
__________________________ 42. A laboratory in a major university surveys all the reactions
involving bromine.
__________________________ 43. A pharmaceutical company explores a disease in order to
produce a better medicine.
__________________________ 44. A scientist investigates the cause of the ozone hole to find a way
to stop the loss of the ozone layer.
__________________________ 45. A pharmaceutical company discovers a more efficient method of
producing a drug.
__________________________ 46. A chemical company develops a new biodegradable plastic.
__________________________ 47. A laboratory explores the use of ozone to inactivate bacteria in a
drinking-water system.
Classify each of the following as a homogeneous or heterogeneous substance.
__________________ 48.
iron ore
__________________ 49.
quartz
__________________ 50.
granite
__________________ 51.
energy drink
__________________ 52.
oil-and-vinegar salad dressing
__________________ 53.
salt
__________________ 54.
rainwater
__________________ 55.
nitrogen
Classify each of the following as a physical or chemical change.
__________________ 56.
ice melting
__________________ 57.
paper burning
__________________ 58.
metal rusting
__________________ 59.
gas pressure increasing
__________________ 60.
liquid evaporating
__________________ 61.
food digesting
Match the description on the right to the most appropriate quantity on the left.
62.____ 2 m3
(a)
63.____ 0.5 g
(b) length of a small paper clip
64.____ 0.5 kg
(c)
65.____ 600 cm2
(d) volume of a refrigerator compartment
66.____ 20 mm
(e)
surface area of the cover of this workbook
(f)
mass of a jar of peanut butter
mass of a small paper clip
length of a stretch limousine
67. _____ A measured quantity is said to have good accuracy if
(a)
(b)
(c)
(d)
it agrees closely with the accepted value.
repeated measurements agree closely.
it has a small number of significant figures.
all digits in the value are significant.
68. A certain sample with a mass of 4.00 g is found to have a volume of 7.0 mL. To calculate the density of
the sample, a student entered 4.00  7.0 on a calculator. The calculator display shows the answer as
0.571429.
__________________ a. Is the setup for calculating density correct?
__________________ b. How many significant figures should the answer contain?
69. It was shown in the text that in a value such as 4000 g, the precision of the number is uncertain. The
zeros may or may not be significant.
__________________ a. Suppose that the mass was determined to be 4000 g.
How many significant figures are present in this measurement?
__________________ b. Suppose you are told that the mass lies somewhere between 3950 and 4050
g. Use scientific notation to report the value, showing an appropriate number
of significant figures.
70. If you divide a sample’s mass by its density, what are the resulting units?
71. Three students were asked to determine the volume of a liquid by a method of their choosing. Each
performed three trials. The table below shows the results. The actual volume of the liquid is 24.8 mL.
Student A
Student B
Student C
Trial 1
(mL)
34.8
34.2
34.6
Trial 2
(mL)
34.8
34.3
34.8
Trial 3
(mL)
34.4
34.3
35.0
__________________ a. Considering the average of all three trials, which student’s measurements
show the greatest accuracy?
__________________ b. Which student’s measurements show the greatest precision?
72.A horizontal row of elements in the periodic table is called a(n) _______________.
73. The symbol for the element in Period 2, Group 13, is _______________.
74. Elements that are good conductors of heat and electricity are _______________.
75. Elements that are poor conductors of heat and electricity are _______________.
76. A vertical column of elements in the periodic table is called a(n) _______________.
77. The ability of a substance to be hammered or rolled into thin sheets is called _______________.
78. Is an element that is soft and easy to cut cleanly with a knife likely to be a metal or a nonmetal?
_______________.
79. The elements in Group 18, which are generally unreactive, are called _______________.
80. At room temperature, most metals are _______________.
81. Name three characteristics of most nonmetals.
_______________________________________________________________
82. Name three characteristics of metals.
_______________________________________________________________
83. Name three characteristics of most metalloids.
_______________________________________________________________
84. Complete the table below by filling in the spaces with correct names or symbols.
Name of element
Aluminum
Symbol of element
Ca
Mn
Nickel
Potassium
Cobalt
Ag
H
PROBLEMS Write the answer on the line to the left. Show all your work in the space provided.
85. _________________
A single atom of platinum has a mass of 3.25  1022 g.
What is the mass of 6.0  102 3 platinum atoms?
86. A sample thought to be pure lead occupies a volume of 15.0 mL and has a mass of 160.0 g.
__________________ a. Determine its density.
__________________ b. Is the sample pure lead?
____________________ c. Determine the percentage error, based on the accepted value for the density
of lead.
Express the following quantities in scientific notation:
87..
8 800 000 000 m
88.
0.0015 kg
89.
0.000 000 000 06 kg/m3
90.
8 002 000 Hz
91.
0.009 003 amp
92.
70 000 000 000 000 000 km
93.
6028 L
94.
600 005 000 kJ/h
95.
1 cm
.Perform the following computations, and express the result in scientific notation with the correct
number of significant figures:
96.
1.54  101 L  2.36  104 s
97.
3.890  104 mm  4.71  102 mm2
98.
9.571  103 kg  3.82  101 m2
99.
8.33  103 km  1.97  102 s
100.
9.36  102 m  3.82  103 m  9.01  101 m