AnswersNY-Chemistry Term 1 HillcrestUnit Test

Unit Test — Unit test Answers

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1
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Consider the half reaction below.Which statement best describes what is taking place?

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A
Chlorine is losing electrons and being oxidized.
B
Chlorine is losing electrons and being reduced.
C
Chlorine is gaining electrons and being oxidized.
D
Chlorine is gaining electrons and being reduced.
2
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Which shows the correct relationship between the molecular formula and the empirical formula for C2H10N2?

A
molecular formula = 2 empirical formula
Option A
B
empirical formula = 2 molecular formula
Option B
C
molecular formula = 62.1 empirical formula
Option C
D
empirical formula = 14 molecular formula
Option D
3

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.
4

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
5

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.
6

Consider the reaction below.What is being reduced?

Question illustration
A
only K
B
only Br2
C
both K and Br2
D
neither K nor Br2
7

What is the percent by mass of potassium in K3Fe(CN)6?Use .

Question illustration
A
16.96%
B
21.88%
C
25.53%
D
35.62%
8

Which type of reaction is represented by the generic equation AB + CD AD + CB?

Question illustration
A
combustion
B
decomposition
C
single replacement
D
double replacement
9

Which statement best describes London dispersion forces?

A
repulsive intramolecular forces
B
attractive intramolecular forces
C
attractive intermolecular forces
D
repulsive intermolecular forces
10

Which characteristic best identifies a decomposition reaction?

A
a single compound as a reactant
B
a single compound as a product
C
an element and a compound as reactants
D
an element and a compound as products
11

Which element is likely to be the most brittle?

A
selenium
B
cobalt
C
platinum
D
zinc
12

Which statement best describes the effect of low ionization energies and low electronegativities on metallic bonding?

A
The valence electrons are easily delocalized.
B
The valence electrons stay in a single orbital.
C
The valence electrons break free of the crystals.
D
The valence electrons move closer to the nuclei.
13

What is the oxidation number for N in the compound NH3? (Recall that H usually has an oxidation number of +1.)

A
–3
B
–1
C
0
D
+3
14

Which of the following is not an oxidation-reduction reaction?

A
XeF6(s) XeF4(s) + F2(g)
Option A
B
2Cs(s) + I2(g) 2CsI(s)
Option B
C
2H2SO4(aq) + 2Ba(OH)2(aq) 2BaSO4(s) + 4H2O(l)
Option C
D
Zn(s) + 2AgNO3(aq) Zn(NO3)2(aq) + Ag(s)
Option D
15

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
16

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.
17

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
18

Which answer best describes what is happening in the following redox reaction?4Fe + 3O2 2Fe2O3

Question illustration
A
This is combustion.
B
This is neutralization.
C
Iron is oxidized to form rust.
D
Oxygen is oxidized to form rust.
19

The reaction below was carried out in an acidic solution.Which statement is true about this equation?

Question illustration
A
Although it is unbalanced, it can be balanced by using the half-reaction method.
B
It has been balanced by using the half-reaction method.
C
It has been balanced by directly using spectator ions.
D
Although it is unbalanced, it can be balanced by directly using spectator ions.
20

When applied to a dish, soap makes grease soluble in water. Which explanation correctly supports the role of intermolecular forces in this common observation?

A
The nonpolar end of a soap molecule attaches itself to grease.
B
The nonpolar end of a soap molecule attaches itself to water.
C
The polar soap molecule attaches itself to the dish.
D
The polar soap molecule attaches itself to a nonpolar soap molecule.

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