AnswersLAUSD-Chemistry in the Earth System BCumulative Exam

Cumulative Exam — Cumulative exam Answers

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In the hypothetical reaction below, substance A is consumed at a rate of 2.0 mol/L·s. If this reaction is at dynamic equilibrium, at what rate will substance B be consumed?A B

Question illustration
A
0.0 mol/L·s
B
1.0 mol/L·s
C
2.0 mol/L·s
D
4.0 mol/L·s
2
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Water exits the leaves of plants and enters the atmosphere. What is this process called?

A
photosynthesis
B
condensation
C
transpiration
D
precipitation
3

Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation represents this violent reaction?

A
sodium hydroxide + water sodium + hydrogen
Option A
B
sodium + water sodium hydroxide + hydrogen
Option B
C
sodium + hydrogen sodium hydroxide + water
Option C
D
sodium + sodium hydroxide water + hydrogen
Option D
4

Which is true about reaction rates?

A
High reaction rates occur only in spontaneous reactions.
B
Low reaction rates occur only in nonspontaneous reactions.
C
Reaction rates are not dependent on high or low activation energies.
D
Reaction rates are not related to spontaneity.
5

An unknown substance turns methyl orange solution red. This shows that the substance

A
is a base.
B
is water.
C
is an acid.
D
is an alkaloid.
6

Which phrase describes one main feature of the atmosphere?

p
protects Earth’s surface
i
includes organisms in the air, on land, and in water
c
consists of rocks, minerals, landforms, and Earth’s interior
c
comprises oceans, lakes, rivers, streams, and groundwater
7

Which landform is part of the cryosphere?

A
glacier
B
lake
C
ocean
D
river
8

Which example is a short-term environmental change?

i
ice age
t
tsunami
g
global warming
l
large asteroid impact
9

Which correctly lists the three weather factors that are indicators of climate change?

A
sunsets, wind patterns, clouds
B
ocean currents, ice cores, temperature
C
temperature, wind patterns, ice cores
D
wind patterns, temperature, ocean currents
10

Which is one way that analyzing ice benefits scientists who study ancient climates?

A
Scientists can analyze frozen volcanic dust to help predict eruptions.
B
Scientists can study the layers of ice cores to gather information about past atmospheric composition.
C
Scientists can use sand grains in ice to make inferences about the climate area.
D
Scientists can study tree rings in ice to learn more about past climates.
11

Which statement best describes how dynamic equilibrium relates to a saturated solution of sodium chloride?

A
The concentration of the dissolved particles remains constant.
B
No more solid dissolves in a saturated solution.
C
Each second, the amount of solid sodium chloride that dissolves equals the amount of solid sodium chloride that recrystallizes.
D
Each second, solid sodium chloride dissolves and solid sodium chloride recrystallizes.
12

Which is an issue that governments must consider before passing conservation policies?

A
urbanization implications
B
cost to implement conservation policies
C
desertification implications
D
cost to implement deforestation
13

Which of the following is a simple definition of reduction?

A
the loss of electrons
B
the gain of electrons
C
an agent that oxidizes something
D
an agent that reduces something
14

Which statement describes an interaction between the biosphere and the hydrosphere?

A
Plant roots take in water through their roots.
B
Plants take in carbon dioxide from the air.
C
Energy stored in plants is transferred to humans and animals that eat them.
D
Plants make food through photosynthesis and release oxygen into the atmosphere.
15

Which statement best describes monsoons?

A
They force cool, moist air from oceans to rise.
B
They are winds that blow in the opposite direction of a normal wind.
C
They bring heavy rain in the winter and in the summer.
D
They influence precipitation as wind moves near a mountain.
16

How does litmus paper identify a base?

A
A base turns red litmus blue.
B
A base turns blue litmus red.
C
A base turns orange litmus red.
D
A base turns yellow litmus blue.
17

What is the final, balanced equation that is formed by combining these two half reactions?

Question illustration
A
Upper C u superscript 2 plus, plus upper N upper O subscript 3 superscript minus, plus 4 e superscript minus, plus 2 upper H superscript plus right arrow upper C u plus upper N upper O subscript 2 superscript minus, plus upper H subscript 2 upper O.
Option A
B
Upper C u plus upper N upper O subscript 3 superscript minus, plus 2 upper H superscript plus right arrow upper C u superscript 2 plus, plus upper N upper O subscript 2 superscript minus, plus upper H subscript 2 upper O.
Option B
C
2 upper C u plus upper N upper O subscript 3 superscript minus plus 2 upper H superscript plus right arrow 2 upper C u superscript 2 plus, plus upper N upper O subscript 2 superscript minus, plus upper H subscript 2 upper O.
Option C
D
Upper C u plus upper N upper O subscript 3 superscript minus, plus 2 upper H superscript plus right arrow upper C u superscript 2 plus, plus upper N upper O subscript 2 superscript minus, plus 2 upper H subscript 2 upper O.
Option D
18

Chemists use activity series to determine whether which type of reaction will occur?

A
combustion
B
double replacement
C
decomposition
D
single replacement
19

Consider the following chemical reaction of bromothymol blue indicator. It appears yellow in undissociated form and blue in its dissociated aqueous solution. HC2H3O2(aq) H+(aq) + C2H3O2–(aq)yellow blue What will be the color of the solution if a large amount of H2CO3 is added?

Question illustration
A
The solution will remain yellow.
B
The solution will turn blue.
C
The solution will turn pink.
D
The solution will turn green.
20

The pictures below show samples of different substances.The mass and volume of each sample differ from the mass and volume of the other samples. Is it possible for each sample to contain 1 mol of each substance?

Question illustration
A
No, because they have different masses.
B
No, because they have different volumes.
C
Yes, if each sample contains 6.02 x 1023 atoms.
D
Yes, if each sample contains 2 amu.

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