AnswersChemistry - SC3210 A-CRUnit Test

Unit Test — Unit test Answers

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1
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Among the intermolecular forces, which forces are typically the weakest?

A
dipole-dipole interactions
B
hydrogen bonds
C
dipole-induced dipole interactions
D
London dispersion forces
2
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The diagram below shows DNA molecules.What do the broken lines connected to hydrogen atoms represent in this diagram?

Question illustration
A
the weakest intermolecular forces
B
the weakest intramolecular forces
C
the strongest intermolecular forces
D
the strongest intramolecular forces
3

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
4

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.
5

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.
6

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.
7

Which is the name for SiO2?

A
silicon dioxide
B
silicon trioxygen
C
disilicon dioxygen
D
monosilicon oxide
8

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
9

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.
10

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.
11

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.
12

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
13

Which statement best describes the properties of metals?

A
They are shiny and bend without breaking.
B
They are dull and are good electrical insulators.
C
They conduct electricity well and are brittle.
D
They can be flattened and do not conduct heat well.
14

Which element is likely to be the most brittle?

A
selenium
B
cobalt
C
platinum
D
zinc
15

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
16

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
17

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
18

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)
19

Which compound has the highest melting point?

A
Al2(CO3)3
B
C12H22O11
C
C8H18
D
H2O
20

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

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