AnswersIA-Chemistry A Survey of Chemistry AUnit Test

Unit Test — Unit test Answers

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1
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Which is the name for SiO2?

A
silicon dioxide
B
silicon trioxygen
C
disilicon dioxygen
D
monosilicon oxide
2
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In water, HNO3 produces H+ ions. Which is the name for HNO3 in an aqueous solution?NameSymbolnitrate NOnitriteNOnitrogenN

Question illustration
A
hydrogen nitrate
B
nitric acid
C
saltpetre
D
nitrous acid
3

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
4

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.
5

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
6

Which statement describes how the binary ionic compound KBr is named?

A
The nonmetal is named first, and the name is unchanged.
B
The metal is named first, and the name is unchanged.
C
The nonmetal is named second, and the name is unchanged.
D
The metal is named second, and the name is unchanged.
7

Which compound has the highest melting point?

A
Al2(CO3)3
B
C12H22O11
C
C8H18
D
H2O
8

What is the ratio of Al ions to S ions in a neutral compound?

Question illustration
A
1:1
B
2:1
C
2:3
D
3:2
9

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
10

Which formula represents the compound commonly known as phosphine with IUPAC name phosphorus trihydride?

A
PH
B
PH2
C
PH3
D
PH4
11

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.
12

Which statement describes covalent bases?

A
They have hydroxide ions.
B
They produce hydrogen ions.
C
They are often amines.
D
They are named the same as ionic compounds.
13

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.
14

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.
15

What is the chemical formula for zinc (II) phosphate?

A
ZnP
Option A
B
Zn(PO)
Option B
C
Zn(PO)
Option C
D
Zn(NO)
Option D
16

What is the name of the ionic compound CaO?

A
calcium oxygen
B
calcium oxide
C
calcium(I) oxide
D
calcium(II) oxide
17

Some atoms are exceptions to the octet rule by having an expanded octet. Which characteristic is needed for an atom to have an expanded octet?

A
The atom has empty d-orbitals.
B
The atom has more than eight valence electrons before bonding.
C
The atom has empty p-orbitals.
D
The atom has fewer than eight valence electrons after bonding.
18

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.
19

Which statement correctly describes the phosphate ion, ?

Question illustration
A
It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion.
B
It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom.
C
It is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion.
D
It is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.
20

The table lists the lattice energies of some compounds.CompoundLattice Energy (kJ/mol)LiF –1,036LiCl –853NaF –923KF –821NaCl –786Which statement about crystal lattice energy is best supported by the information in the table?

A
The lattice energy increases as cations get smaller, as shown by LiF and KF.
B
The lattice energy increases as the cations get larger, as shown by LiF and LiCl.
C
The lattice energy decreases as cations get smaller, as shown by NaCl and NaF.
D
The lattice energy decreases as the cations get smaller, as shown by NaF and KF.

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