AnswersFL-2003350-Chemistry 1 HonorsCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Which is true of transition metals when moving from left to right on the periodic table?

A
The d sublevels are not filled across the period.
B
The cation radii become larger across the period.
C
Atomic radii increase slightly and then start to decrease.
D
Atomic radii decrease slightly and then start to increase.
42
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Which method for treating arthritis is an example of pseudoscience?

A
diet
B
drugs
C
exercise
D
magnets
43

A scientist is studying the effect on human health of bacteria that live in the human intestine. In her study, she found that the bacteria actually help the body’s immune response. To develop scientific consensus about her idea, the scientist should

A
contact a local reporter to share her ideas.
B
publish her results in a peer-reviewed journal.
C
advise other scientists that her experiment does not require replication.
D
avoid sharing her research methods to see if other scientists obtain the same results on their own.
44

Two animals that can be found at the Grand Canyon include the Abert’s and Kaibab squirrels. The Abert’s squirrel is found at the south rim of the canyon and in a few surrounding states. The Kaibab squirrel, however, can only be found at the canyon’s north rim, mainly on the Kaibab Plateau. The Kaibab squirrel is not found anywhere else in the world. Scientists believe that the squirrels are actually closely related and have developed separately as a result of geographic isolation. It is possible that the squirrels were separated by plateau erosion that separated the forests and isolated the Kaibab population. Some scientists are studying if the squirrels are now two separate species or if the Kaibab squirrel is simply a subspecies of the Abert’s squirrel. Separate species are unable to reproduce with each other. Which evidence would be used to support the claim that the squirrels are two separate species?

A
The Abert’s squirrel is found at the south rim of the canyon, but the Kaibab squirrel is found at the north rim of the canyon.
B
Geologists prove that plateau erosion is the main cause of forest separation in the region.
C
Scientists observe that Abert’s squirrels are slightly larger and have bushier tails than Kaibab squirrels do.
D
When placed together in pairs for study, no pair of Abert’s squirrel and Kaibab squirrel result in offspring.
45

Which question is the best scientific question?

A
Why does a duck eat?
B
Does a duck like what it eats?
C
Should people eat duck?
D
What does a duck eat most often?
46

A mixture of three noble gases has a total pressure of 1.25 atm. The individual pressures exerted by neon and argon are 0.68 atm and 0.35 atm, respectively. What is the partial pressure of the third gas, helium?Use .

Question illustration
A
0.22 atm
B
0.33 atm
C
1.03 atm
D
2.28 atm
47

If the pressure of a gas is 2.000 × 104 kPa, what is its pressure in atm?

A
26.32 atm
B
197.4 atm
C
1.013 ´ 106 atm
D
2.026 ´ 106 atm
48

The diagram below compares hypotheses, theories, and laws.What term is missing from the central region that describes hypotheses, theories, and laws?

Question illustration
A
popular
B
predictable
C
mathematical
D
falsifiable
49

Which best describes a compound such as magnesium oxide?

A
an impure substance that is made up of two elements
B
a mixture of two uncommon substances
C
a mixture of two common elements
D
a pure substance that is made up of different elements
50

In an investigation with density, Marcia’s teacher measures the mass and volume of 10 different samples of a substance. The samples are numbered 1 through 10. Then, the teacher makes the graph that is shown below.What is the independent variable in this investigation?

Question illustration
A
mass
B
volume
C
sample number
D
substance density

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