AnswersLAUSD-Chemistry in the Earth System BCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Which is the correct order of processes that occur as water moves from a lake to a cloud and then back to Earth's surface?

A
evaporation, condensation, precipitation
B
condensation, evaporation, precipitation
C
precipitation , condensation, evaporation
D
evaporation, precipitation, condensation
42
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When a volcano erupts, tiny particles from which of Earth’s spheres are released into the air?

A
atmosphere
B
biosphere
C
geosphere
D
hydrosphere
43

Consider the following system at equilibrium. CaCO3(s) Ca2+(aq) + CO32–(aq) The addition of which compound will cause a shift in equilibrium because of a common ion effect?

Question illustration
A
CCl4
B
CO2
C
CuSO4
D
Na2CO3
44

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

Question illustration
A
mc031-2.jpg
Option A
B
K subscript e q equals StartFraction StartBracket upper C upper O subscript 2 EndBracket over StartBracket upper O subscript 2 EndBracket EndFraction.
Option B
C
K subscript e q equals StartFraction StartBracket upper C EndBracket StartBracket upper O subscript 2 EndBracket over StartBracket upper C upper O subscript 2 EndBracket EndFraction.
Option C
D
K subscript e q equals StartFraction StartBracket upper O subscript 2 EndBracket over StartBracket upper C upper O subscript 2 EndBracket EndFraction.
Option D
45

Consider the chemical reaction in equilibrium. H2 + I2 + heat 2HI What will happen to the chemical equilibrium if the temperature of the system is increased?

Question illustration
A
The direction of the chemical equilibrium will shift to the right, favoring the forward reaction.
B
The chemical equilibrium will not be affected by an increase in temperature.
C
The direction of the chemical equilibrium will shift to the left, favoring the reverse reaction.
D
The chemical equilibrium will be lost permanently with a change of temperature.
46

A sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°C. If the system is at dynamic equilibrium, which of these statements is true?

A
The rate of freezing is equal to the rate of melting.
B
The rate of freezing is greater than the rate of melting.
C
The amount of ice is greater than the amount of water.
D
The amount of ice is equal to the amount of water.
47

Consider the unbalanced equation for the oxidation of aluminum._Al + _O2 _Al2O3Which sequence of coefficients should be placed in the blanks to balance this equation?

Question illustration
A
2, 3, 1
B
1, 3, 2
C
4, 3, 2
D
3, 2, 3
48

Consider the word equation.calcium hydroxide + hydrochloric acid calcium chloride + waterWhich is the corresponding formula equation?

Question illustration
A
Upper C a upper C l subscript 2 right arrow upper C a (s) plus upper C l subscript 2 (g).
Option A
B
Upper C a upper O (s) plus upper H subscript 2 upper O (l) right arrow upper C a (upper O upper H) subscript 2 (a q).
Option B
C
Upper N a upper O upper H (a q) plus 2 upper H upper C l (a q) right arrow upper N a upper C l (a q) plus 2 upper H subscript 2 upper O (l).
Option C
D
Upper C a (upper O H) subscript 2 (s) plus 2 upper H upper C l (l) right arrow upper C a upper C l subscript 2 (a q) plus 2 upper H subscript 2 upper O (l).
Option D
49

Consider the redox reaction below.Which statement correctly describes a half-reaction that is taking place?

Question illustration
A
Hydrogen is oxidized from +1 to 0.
B
Chlorine is reduced from –1 to 0.
C
Aluminum is oxidized from 0 to +3.
D
Hydrogen is reduced from 0 to –1.
50

The graph below shows how solubility changes with temperature.Which two solutions have similar solubilities at 40°C?

Question illustration
A
Na2SO4 and NaCl
B
Na2HAsO4 and NaCl
C
Na2HAsO4 and Na2SO4
D
Ba(NO3)2 and Ce2(SO4)3 • 9H2O

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