AnswersMO-Physical Science A-CRUnit Test

Unit Test — Unit test Answers

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Which are the products in the equation CH3SH + 4O2 → CO2 + SO2 +2H2O? Check all that apply.

A
CH3SH
B
O2
C
CO2
D
SO2
E
H2O
22
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How many chlorine atoms are on the products side of the reaction 2Al + 6HCl → 2AlCl3 + 3H2?

A
2
B
3
C
6
D
9
23

An atom of lithium (Li) forms an ionic bond with an atom of chlorine (Cl) to form lithium chloride. How are the valence electrons of these atoms rearranged to form this bond?

A
A few valence electrons are shared between the atoms.
B
Many valence electrons are shared between the atoms.
C
Electrons are transferred from the chlorine atom to the lithium atom.
D
Electrons are transferred from the lithium atom to the chlorine atom.
24

Consider the following reversible reaction.What is the equilibrium constant expression for the given system?

Question illustration
A
K e q equals StartFraction StartBracket upper C upper O EndBracket StartBracket upper H 2 EndBracket superscript 2 over StartBracket upper C upper H subscript 3 upper O upper H EndBracket EndFraction.
Option A
B
K e q equals StartFraction StartBracket upper C upper H subscript 3 upper H upper O EndBracket over StartBracket upper C upper O EndBracket StartBracket upper H 2 EndBracket superscript 2 EndFraction.
Option B
C
K e q equals StartFraction StartBracket upper C upper O EndBracket StartBracket upper H 2 EndBracket over StartBracket upper C upper H subscript 3 upper O upper H EndBracket EndFraction.
Option C
D
K e q equals sart fraction StartBracket upper C upper H subscript 3 upper O StartBracket upper C upper O EndBracket StartBracket upper H 2 EndBracket EndFraction.
Option D
25

Sal drew the electron dot diagram of an aluminum atom as shown.

Question illustration
A
He should add five more dots so that the atom obeys the octet rule.
B
He should add ten more dots so that all thirteen electrons are shown.
C
He should add a single dot below the symbol.
D
He should add one dot below and one dot to the left of the symbol.
26

Consider the reaction.When does the given chemical system reach dynamic equilibrium?

Question illustration
A
when the forward and reverse reactions stop
B
when the rate of the forward reaction is higher than the rate of the reverse reaction
C
when the concentration of the reactants is higher than the concentration of the products
D
when the rates of the forward and reverse reactions are equal
27

Which condition must be met in order for an equation to be balanced?

A
The elements in the reactants are the same as the elements in the products.
B
There are fewer elements in the reactants than there are in the products.
C
The number of atoms in the reactants is greater than the number of atoms in the products.
D
The number of atoms in the reactants equals the number of atoms in the products.
28

What else is produced during the replacement reaction of silver nitrate and potassium sulfate?2AgNO3 + K2SO4 Ag2SO4 + ________

Question illustration
A
KNO3
B
2KNO3
C
K2
D
2AgNO3
29

According to Le Chatelier’s principle, what happens when the concentration of reactants is doubled in a chemical reaction that was in equilibrium?

A
The equilibrium shifts to the right to favor the formation of products.
B
The equilibrium shifts to the left to favor the formation of reactants.
C
The equilibrium is unaffected by the increase in concentration.
D
The equilibrium is lost because the concentrations have been disturbed.

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