AnswersFL-2003350-Chemistry 1 HonorsPercent Composition and Molecular Formula

Percent Composition and Molecular Formula — Cumulative exam Answers

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21
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The table below gives the data that is needed to calculate the average atomic mass of element B.IsotopeAtomic mass (amu)Relative abundance (%)B-1010.0119.91B-1111.0180.09Based on these data, what is the average atomic mass of element B?

A
10.01
B
10.51
C
10.81
D
11.01
22
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Which describes the polarity in a water molecule?

A
partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms
B
partial negative charge on the oxygen atom because it pulls electrons from the hydrogen atoms
C
partial positive charge on the oxygen atom because it pulls electrons from the hydrogen atoms
D
partial positive charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms
23

Water is called the “universal solvent.” Which statement best explains this description with respect to ionic compounds?

A
Water can dissociate all ionic compounds through ion-dipole interactions.
B
Water can hydrate many ionic compounds through hydrogen-bonding interactions.
C
Water can dissociate many ionic compounds through ion-dipole interactions.
D
Water can hydrate many ionic compounds through dipole-dipole interactions.
24

Yusef adds all of the values in his data set and then divides by the number of values in the set.What is Yusef most likely finding?

A
the percent error
B
the median
C
the standard deviation
D
the mean
25

To explain the photoelectric effect, Albert Einstein linked the photoelectric effect to an idea from which scientist?

A
Heinrich Hertz
B
Isaac Newton
C
Max Planck
D
Thomas Young
26

Which statement about hydrogen bonds is true?

A
They are the only force that allows a gecko to climb up glass.
B
They are the weakest of the intermolecular forces.
C
They are much stronger than intramolecular forces.
D
They help water striders walk on water by creating surface tension.
27

Scientists described light as a wave because the results of many experiments with light demonstrated that light behaves as a wave. Light is now described as having properties of both a wave and a particle. What is the most likely reason why this change was made?

A
Enough scientists voted to accept the change.
B
Data collected from many experiments could not be explained using waves.
C
A well-known scientist published a paper that described light as a particle.
D
A single experiment’s results demonstrated both wave and particle properties.
28

Chuck wants to know how many electrons in an atom are not paired up. Which model would be best for Chuck to write out?

A
a set of quantum numbers for the last electron in the atom
B
a configuration with numbers, letters, and superscripts
C
a dot structure of the atom
D
an orbital notation of the atom
29

Which is a correct comparison between the modern quantum model and John Dalton’s model of the atom?

A
The modern model is not as widely accepted by scientists as Dalton’s model.
B
The modern model states that atoms of all elements are identical, whereas Dalton’s model does not.
C
The modern model recognizes particles in the atom, whereas Dalton’s model does not.
D
The modern model does not explain emission spectra, whereas Dalton’s model does.
30

A substance conducts an electric current when it is in the liquid state. What would the conductivity of the substance in solid form indicate about the type of bond in the substance?

A
If the solid is conductive, the bonds are ionic.
B
If the solid is not conductive, the bonds are covalent.
C
If the solid is conductive, the bonds are metallic.
D
If the solid is not conductive, the bonds are metallic.
31

Which molecular geometry is least likely to occur with sp3 hybridization?

A
tetrahedral
B
trigonal planar
C
bent
D
trigonal pyramidal
32

Which of these properties is the best one to use for identification of an element?

A
the number of neutrons in the atomic nucleus
B
the number of protons in the atomic nucleus
C
the number of isotopes that are formed by the element
D
the number of charges on ions of the element
33

What is the ratio of Fe ions to O ions in a neutral compound?

Question illustration
A
1:2
B
2:1
C
2:3
D
3:2
34

Which action do researchers take to make advances in science?

A
They guard their findings against the scrutiny of outside sources.
B
They share their experimental results with other researchers.
C
They reduce their participation in working with other scientists.
D
They announce their findings in newspapers to avoid peer review.
35

Which trait would most likely lead a scientist to investigate a blood-thinning agent in the saliva of vampire bats?

A
creativity
B
curiosity
C
diversity
D
skepticism
36

Which will most likely lead to new scientific discoveries in future years?

A
current scientific knowledge
B
current science fiction movies
C
reduction of the elementary school science curriculum
D
rejection of all new scientific ideas
37

Which term best describes the important pieces of information that scientists gather and record during an experiment?

A
conclusions
B
data
C
research
D
supplies
38

A chemist dilutes a 1.0 mL sample of 2.0 M KNO3 by adding water to it. If the concentration of the solution that is obtained is 0.0080 M, what is its volume?Use .

Question illustration
A
125 mL
B
250 mL
C
500 mL
D
2,000 mL

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