AnswersCR Chemistry S1 Q3050OXLab: Ionic and Covalent Bonds

Lab: Ionic and Covalent Bonds — Unit test Answers

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1
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Based on its location in the periodic table, what can most likely be predicted about sulfur?

A
It has four valence electrons available for bonding.
B
It has four nonbonding electrons.
C
It has six valence electrons available for bonding.
D
It has six nonbonding electrons.
2
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What was Johann Dobereiner’s contribution to the development of the periodic table?

A
He arranged the elements according to increasing atomic mass.
B
He arranged the elements according to increasing atomic number.
C
He identified triads of elements that had similar properties.
D
He organized elements into four groups based on their properties.
3

Which of the following could form an ionic bond with an anion?

A
Hg22+
B
NO2–
C
SO32–
D
Ar
4

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.
5

A piece of sodium metal can be described as

A
a pure substance and a compound.
B
an impure substance that is reactive.
C
an impure substance that is unreactive.
D
a pure substance and an element.
6

Which of the following do Lewis structures help us understand?

A
the exact structure of a molecule
B
the number of electrons that are involved in the bonding of the molecule
C
the total number of electrons in a molecule
D
how electrons attract other electrons in a molecule
7

What is the predicted order of first ionization energies from highest to lowest for lithium (Li), sodium (Na), potassium (K), and rubidium (Rb)?

A
Rb > K > Na > Li
B
K > Rb > Na > Li
C
Li > Na > K > Rb
D
Rb > K > Li > Na
8

Which compound most likely contains polar covalent bonds?

A
NaCl
B
AlF3
C
Br2
D
NF3
9

Who reported four “element” classifications, but included some substances that were combinations of elements rather than true elements in his listing?

A
Henry Moseley
B
Dmitri Mendeleev
C
Antoine Lavoisier
D
Johann Dobereiner
10

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.
11

The symbol for xenon (Xe) would be a part of the noble gas notation for the element

A
antimony.
B
cesium.
C
radium.
D
uranium.
12

What is the electron configuration of chlorine (Cl)?

A
1s22s22p63s23p3
B
1s22s22p63s23p5
C
1s22s22p63s24s23p3
D
1s22s22p63s23p23d3
13

What is the electron configuration for helium (He)?

A
1s1
B
1s2
C
1s22s1
D
1s22s2
14

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
15

Which best describes why NH4+ can form an ionic bond with Cl–?

A
Its outermost shell gains one or more electrons from Cl–.
B
Its positive charge is attracted to the negative charge of Cl–.
C
It has a negative charge that is spread over the entire ion.
D
It has a nitrogen atom that is strongly attracted to Cl–.

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