AnswersFL-2003350-Chemistry 1 HonorsPercent Composition and Molecular Formula

Percent Composition and Molecular Formula — Cumulative exam Answers

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1
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Which element would most likely have chemical properties similar to that of magnesium (Mg)?

A
Ar
B
Ca
C
F
D
Ni
2
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Which statement describes a chemical property of water?

A
It reacts with sodium metal.
B
It has a melting point of 0°C.
C
It has a density of about 1 g/mL.
D
It is clear and colorless.
3

What should the IUPAC name for a binary covalent compound lack?

A
prefixes
B
Roman numerals
C
an -ide ending
D
the name of a nonmetal
4

A student is creating a table that compares theories, hypotheses, and laws. TheoryHypothesisLawIs testable Is falsifiable Is used to make predictions Provides explanations In which row should the student enter “Yes” in the columns for Theory and Hypothesis only?

A
Is testable
B
Is falsifiable
C
Is used to make predictions
D
Provides explanations
5

Which of these is an example of a physical change?

A
sugar, when heated, producing carbon dioxide and water
B
solid ice, when heated, turning into liquid water
C
sodium, when exposed to chlorine, forming sodium chloride
D
aluminum, when heated in air, forming aluminum oxide
6

An atom of an element is shown by the model.How is this model useful?

Question illustration
A
It shows how electrons are distributed in the shells of an iron atom.
B
It shows how electrons are distributed in the shells of a cobalt atom.
C
It shows how orbitals are distributed in the shells of an iron atom.
D
It shows how orbitals are distributed in the shells of a cobalt atom.
7

What is the percent by mass of water in Na2SO4 • 10H2O?Use .

Question illustration
A
5.59%
B
11.26%
C
44.08%
D
55.92%
8

What did J. J. Thomson observe when he applied electric voltage to a cathode ray tube in his famous experiment?

A
The stream of cathode ray particles was moving very slowly.
B
The glass opposite of the negative electrode started to glow.
C
The electric voltage had little effect on the stream of particles.
D
The tube contained two pieces of metal that served as electrodes.
9

In the human body, a series of chemical reactions results in the making of energy that is used at both the cellular and organismal levels. In which course would a person most likely study these chemical reactions?

A
biochemistry
B
geochemistry
C
materials chemistry
D
physical chemistry
10

Which statement is true about an empirical formula?

A
It is the true ratio of atoms in a formula unit.
B
It is the simplest ratio of atoms in a formula unit.
C
It represents the true molecular mass of a chemical formula.
D
It represents the highest ratio of coefficients in a chemical formula.
11

Which statement best describes how to predict the formula of a stable ionic compound?

A
Use the same number of cations as anions so that the compound is neutral.
B
Use more cations than anions so that the compound is positively charged.
C
Use enough cations and anions so that the total charge is zero.
D
Use fewer cations than anions so that the compound is negatively charged.
12

The traits of science and pseudoscience are shown in the table.NumberTrait1Lacks evidence2Supported by evidence3Subjective4Objective5Unresponsive to new information6Continually updatedWhich traits are those of science?

A
2, 3, and 6
B
1, 3, and 5
C
1, 4, and 6
D
2, 4, and 6
13

Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative one?

A
ionic bonding
B
metallic bonding
C
covalent bonding
D
hydrogen bonding
14

Which is a component of John Dalton’s atomic theory?

A
The ratio of atoms in a compound can vary.
B
The atoms of a single element differ.
C
An atom is a small particle that cannot be broken down.
D
Atoms of different elements can be identical.
15

Which statement describes the valence electrons in metallic bonds?

A
They are shared equally between two atoms.
B
They are shared unequally between two atoms.
C
They are shared among many atoms.
D
They are transferred from one atom to another.
16

Which is a property of covalent compounds?

A
They ionize in solution.
B
They tend to be very hard.
C
They have a low boiling point.
D
They have a high melting point.
17

What name should be used for the ionic compound KOH?

A
potassium oxide
B
potassium oxygen hydride
C
potassium hydroxide
D
potassium hydrogen oxide
18

Which compound most likely contains polar covalent bonds?

A
NaCl
B
AlF3
C
Br2
D
NF3
19

Which element has the lowest ionization energy?

Question illustration
A
argon (Ar)
B
bromine (Br)
C
cesium (Cs)
D
nickel (Ni)

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