AnswersChemistry 1A - Mr. KaanUnit Test

Unit Test — Unit test Answers

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1
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Which compound has the highest melting point?

A
Al2(CO3)3
B
C12H22O11
C
C8H18
D
H2O
2
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Lewis structures cannot

A
show the number of valence electrons.
B
show the location of bonds.
C
show the strength of bonds.
D
show how many bonds are present in a molecule.
3

An element has six valence electrons available for bonding. Which group of the periodic table does this element most likely belong to?

A
group 2
B
group 4
C
group 16
D
group 18
4

Which of the following compounds would be expected to have the strongest ionic bonds?

A
the compound that has the largest ions with the greatest charge
B
the compound that has the largest ions with the least charge
C
the compound that has the smallest ions with the greatest charge
D
the compound that has the smallest ions with the least charge
5

The incomplete table below shows selected characteristics of different types of bonds.RowBondCausePhysical property of compound1?Electron sharing among many atomsDuctile2?Electron sharing between two atomsBrittle3??BrittleWhat type of bond is most likely being represented in row 1?

A
ion-dipole
B
ionic
C
metallic
D
covalent
6

Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds?

A
It can be shaped into wires.
B
It has a low melting point.
C
It conducts electricity when in solid form.
D
It conducts electricity when it is dissolved in water.
7

Which statement is true about ionic compounds?

A
Solid ionic compounds are good conductors of electricity.
B
Ionic compounds have varying solubilities in water.
C
Ionic compounds have very low melting points.
D
Ionic compounds are very easy to bend.
8

The table below shows the electronegativity values of various elements on the periodic table.ElectronegativitiesWhich pair of atoms would form a covalent bond ?

Question illustration
A
calcium (Ca) and bromine (Br)
B
rubidium (Rb) and sulfur (S)
C
cesium (Cs) and nitrogen (N)
D
oxygen (O) and chlorine (Cl)
9

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

A
It has three valence electrons.
B
It has four valence electrons.
C
It has five valence electrons.
D
It has six valence electrons.
10

How do ionic bonds affect the properties of ionic compounds?

A
The bonds weakly hold ions together, increasing the melting point.
B
The bonds strongly hold ions together, reducing the boiling point.
C
The bonds prevent ions from moving throughout the crystal, so a solid ionic compound is a poor conductor.
D
The bonds prevent electrons from moving throughout the crystal, so a solid ionic compound is a good conductor.
11

The incomplete table below shows selected properties of compounds that have ionic, covalent, or metallic bonds.RowSubstanceType of bondLikely property1KCl?Brittle2?CovalentDoes not conduct electricity3??MalleableWhich substance would be most suitable for row 3?

A
sodium chloride (NaCl)
B
silver (Ag)
C
nitrogen (N)
Option C
D
propane (CH)
Option D
12

Which is the Lewis structure for H3PO4?

A
Option
Option A
B
A central upper P is single bonded left, right, above, and below to upper Os. The O above the P is single bonded to upper H on the left and the right, and has two electron dots above it. The O below the P is single bonded to an H below, and has pairs of electron dots to the left and right.
Option B
C
A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.
Option C
D
A central upper P is bonded to an upper H above, an upper O below, and upper O's bonded to upper H's to the left and the right. The O below the P has three pairs of electron dots, to the left, right, and below; the other two O's have pairs of dots above and below. A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.
Option D
13

Which property best indicates that a compound contains an ionic bond?

A
It is insoluble in water.
B
It can be easily flattened.
C
It has a low boiling point.
D
It conducts electricity when molten.
14

Which of these best describes an ionic bond?

A
a force that keeps two large molecules together
B
an attraction that occurs between two nonmetals
C
a force that holds two oppositely charged ions together
D
an electromagnetic attraction that occurs between two metals
15

Which statement is generally true about CaCl2?

A
It has only metallic bonds between the atoms.
B
It has only covalent bonds between the atoms.
C
Its bonds are formed by large differences in electronegativity.
D
Its bonds are formed by small differences in electronegativity.
16

Which statement best describes how an ionic bond forms?

A
The transfer of electrons forms strong bonds between ions.
B
The sharing of electrons forms strong bonds between ions.
C
The transfer of electrons results in repulsive forces between molecules.
D
The sharing of electrons results in attractive forces between molecules.
17

Which statement describes a property of covalent compounds?

A
They have a high boiling point because of strong intermolecular forces.
B
They have a low boiling point because of weak intermolecular forces.
C
They have a low melting point because of strong intermolecular forces.
D
They have a high melting point because of weak intermolecular forces.
18

Which pair of elements will form a covalent bond?

A
hydrogen and chlorine
B
sodium and chlorine
C
copper and bromine
D
zinc and bromine
19

Which property is best to use when determining the strength of an ionic bond in a solid?

A
lattice energy
B
conductivity
C
hardness
D
solubility
20

Which pair of ions can form an ionic bond with each other and why?

A
Cu and Ag; They are both metal ions.
Option A
B
S and O; They have like charges.
Option B
C
Br and At; They are both halogen ions.
Option C
D
Li and Br; They have unlike charges.
Option D

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