Pre-AP Test One Retake Qualifying Assignment
Matching
Match each item with the best statement below.
a. organic chemistry
d. analytical chemistry
b. inorganic chemistry
e. physical chemistry
c. biochemistry
____
____
____
____
____
1. Most likely to study the rate at which hydrogen peroxide breaks down into oxygen gas and dihydrogen
monoxide.
2. Most likely to study how iron oxides might be used in industry.
3. This scientist might spend a lot of time trying to synthesize a new carbon-based compound.
4. This type of scientist worked out the metabolic pathway by which glucose is converted to carbon dioxide and
water.
5. This scientist might be found testing the amount sodium fluoride in a water sample just before the water is
released for public consumption.
Match each item with the correct statement below.
a. absolute zero
e.
b. Kelvin temperature scale
f.
c. Celsius temperature scale
g.
d. weight
h.
____
____
____
____
____
____
____
____
6.
7.
8.
9.
10.
11.
12.
13.
mass
significant figure
precision
accuracy
closeness to true value
narrowness of range of measurements
known or estimated in a measurement
the quantity of matter an object contains
the lowest point on the Kelvin scale
the SI scale for temperature
the force of gravity on an object
the non-SI scale for temperature
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____ 14. Which field of science studies the composition and structure of matter?
a. physics
c. chemistry
b. biology
d. geology
____ 15. Which of the following would a chemist be most likely to study?
a. a leaf floating on water
c. a leaf being blown by the wind
b. a leaf changing color in autumn
d. a leaf being eaten by insects
____ 16. Which of the following best describes an example of pure chemistry?
a. testing the effects of lower concentrations of a drug on humans
b. studying chemicals containing carbon
c. developing a cure for osteoporosis
d. finding an antidote for a new strain of virus
____ 17. A theory is a ____.
a. proposed explanation for an observation
b. well-tested explanation for a broad set of observations
c. summary of the results of many observations
d. procedure used to test a proposed explanation
____ 18. Which step in the scientific method requires you to use your senses to obtain information?
a. revising a hypothesis
c. making an observation
b. designing an experiment
d. stating a theory
____ 19. Collaboration and communication are important in science because ____.
a. most research problems are not very complex
b. most scientists have the knowledge to solve any scientific problem
c. they increase the likelihood of a successful outcome
d. they keep scientists from having to repeat experiments
____ 20. Below are steps of the scientific method:
1. Scientists develop scientific models and theories.
2. Scientist research prior publications to gather any previous information related to a phenomenon.
3. A phenomenon is observed and a question is asked regarding a phenomenon.
4. Scientists develop a hypothesis to explain a phenomenon.
5. Experiments are developed to test hypotheses.
What is the correct order to which the steps above are performed by scientist?
____ 21.
____ 22.
____ 23.
____ 24.
____ 25.
____ 26.
____ 27.
____ 28.
a. 4, 5, 3, 2, 1
d. 3, 2, 4, 5, 1
b. 2, 4, 5, 3, 1
e. 4, 5, 1, 2, 3
c. 3, 5, 4, 1, 2
The closeness of a measurement to its true value is a measure of its ____.
a. precision
c. reproducibility
b. accuracy
d. usefulness
When a test instrument is calibrated, does its accuracy, precision, or reliability improve?
a. precision
c. reliability
b. accuracy
d. all of the above
Which group of measurements is the most precise? (Each group of measurements is for a different object.)
a. 2 g, 3 g, 4 g
c. 2 g, 2.5 g, 3 g
b. 2.0 g, 3.0 g, 4.0 g
d. 1 g, 3 g, 5 g
Three different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading of
7.32 g for the mass of the standard. These results imply that the balance that was used is ____.
a. accurate
c. accurate and precise
b. precise
d. neither accurate nor precise
Which of the following measurements is expressed to three significant figures?
a. 0.007 m
c. 7.30 10 km
b. 7077 mg
d. 0.070 mm
How many significant figures are in the measurement 0.003 4 kg?
a. two
c. five
b. four
d. This cannot be determined.
How many significant figures are in the measurement 40,500 mg?
a. two
c. four
b. three
d. five
How many significant figures are in the measurement 811.40 grams?
____ 29.
____ 30.
____ 31.
____ 32.
____ 33.
____ 34.
____ 35.
____ 36.
____ 37.
____ 38.
____ 39.
____ 40.
____ 41.
____ 42.
a. two
c. four
b. three
d. five
Express the sum of 7.68 m and 5.0 m using the correct number of significant digits.
a. 12.68 m
c. 13 m
b. 12.7 m
d. 10 m
Express the product of 2.2 mm and 5.00 mm using the correct number of significant digits.
a. 10 mm2
c. 11.0 mm2
b. 11 mm2
d. 11.00 mm2
What is the measurement 111.009 mm rounded off to four significant digits?
a. 111 mm
c. 111.01 mm
b. 111.0 mm
d. 110 mm
What is the measurement 1042 L rounded off to two significant digits?
a. 1.0 103 L
c. 1050 L
b. 1040 L
d. 1.1 103 L
When multiplying and dividing measured quantities, the number of significant figures in the result should be
equal to the number of significant figures in ____.
a. all of the measurements
b. the least and most precise measurements
c. the most precise measurement
d. the least precise measurement
What is the volume of a salt crystal measuring 2.44 10-2 m by 1.4 10-3 m by 8.4 10-3 m?
a. 2.9 10-7 m3
c. 2.9 10-6 m3
b. 2.9 10-8 m3
d. 2.9 10-4 m3
Which of the following volumes is the smallest?
a. one microliter
c. one milliliter
b. one liter
d. one deciliter
What is the SI unit of mass?
a. liter
c. candela
b. joule
d. kilogram
What is the temperature of absolute zero measured in C?
a. –373 C
c. –173 C
b. –273 C
d. –73 C
Which temperature scale has no negative temperatures?
a. Celsius
c. Joule
b. Fahrenheit
d. Kelvin
What is the boiling point of water in kelvins?
a. 0 K
c. 273 K
b. 100 K
d. 373 K
What is the temperature –34 C expressed in kelvins?
a. 139 K
c. 239 K
b. 207 K
d. 339 K
If the temperature changes by 100 K, by how much does it change in C?
a. 0 C
c. 100 C
b. 37 C
d. 273 C
Chlorine boils at 239 K. What is the boiling point of chlorine expressed in degrees Celsius?
a. 93 C
c. –61 C
b. 34 C
d. –34 C
Short Answer
43. The following length measurements were taken by students using several different measuring devices. Find the
average of the measurements. Make sure that your answer has the correct number of significant figures.
10.05 cm, 10.1 cm, 9.741 cm, 10.6 cm, 10.5 cm
44. Express 0.07 kilograms in grams, using the correct abbreviations.
45. Express 0.07 grams in kilograms, using the correct abbreviations.
46. Express 0.07 megagrams in kilograms, using the correct abbreviations.
47. Express 0.07 kilograms in megagrams, using the correct abbreviations.
48. Express 0.04 liters in cubic meters, using the correct abbreviations.
49. Express 0.04 cubic meters in liters, using the correct abbreviations.
50. A cube of a gold-colored metal with a mass of 386 g is dropped into a 100 mL graduated cylinder containing
50.0 mL of water. If the density of pure gold is 19.3 g/cm3 what volume should the graduated cylinder read after
dropping in the gold?
51. The density of lead, a soft metal, is 11.34 g/cm3. What is the mass of a block of lead that measures 3.00 cm
4.00 cm 4.00 cm?
52. A cube of a silver-colored metal with a volume of 47.6 cm3 has a mass of 500. g. You suspect the metal to be
silver that when pure has a density of 10.5 g/cm3. Is the metal pure silver? Show calculations to justify your
answer.
53. The density of a 10.00 cm by 5.00 cm by 2.00 cm osmium block is
osmium block?
. What is the mass of the
54. You drop an amorphous sample of pure iron into the volumetric cylinder that had 40.0 mL of water in it
originally. After dropping in the iron sample, the volume of water in the graduated cylinder measured 54.4
mL. If the density of iron is 7.874
, what is the mass of the sample of iron?
Problem
55. You have tested out four different methods of determine mass using a standard brass mass of 2.0000 kg. The
results of each method you tested are listed below. Label each method one of the following: accurate and
precise, accurate but not precise, precise but not accurate, or neither accurate nor precise.
Method One
1.9496
1.8998
2.0000
2.0504
2.1002
Method Two
2.0000
2.0001
1.0012
1.9999
1.9988
Method Three
2.0500
2.0010
1.4000
1.7431
1.8568
Method Four
0.9988
0.9988
0.9988
0.9989
0.9987
Essay
56. Use the following passage to answer the questions below.
A student prepares five identical pots, with an identical type and mass of soil. The student then adds
one corn seed to each pot. Then the student adds ammonium nitrate in the amounts of: one gram to the pot
labeled one, two grams to the pot labeled two, four grams to the pot labeled three, eight grams to the pot labeled
five, and none the pot labeled five. The student then moved the pots outside where they could receive sunlight
and added one liter of water to each pot twice a week for one month. After one month, the student measured
the mass of corn that each plant produced.
a. Write a hypothesis for the experiment described above.
b. What was the independent variable in the experiment?
c. What was the dependent variable in the experiment?
d. The soil used in the experiment represents what kind of variable?