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University of Texas *
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Chemistry
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May 5, 2024
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What two processes were responsible for accumulation of free oxygen (O2) in Earth's early atmosphere beginning around 3.6 billion years ago?
Planetary differentiation and outgassing
Volcanic eruptions and meteorite bombardment
Formation of water vapor and escape of free hydrogen (H2) into space
Photosynthetic cyanobacteria and photochemical dissociation of water vapor
Earth's modern atmosphere consists of 78% _________ and 21% __________ along with other gases in much smaller amounts.
Carbon dioxide/nitrogen
Nitrogen/oxygen
Methane/ozone
Oxygen/hydrogen
An ozone layer within Earth's stratosphere was already well-developed by 3.5
billion years ago.
True
False
Which of the following statements regarding Earth's atmospheric layers is TRUE?
Temperature decreases at higher altitudes within both the troposphere and mesosphere
Temperature decreases at higher altitudes within the stratosphere
Atmospheric density is lowest within the troposphere
Temperature and atmospheric density are higher in the mesopause relative to the stratopause
The ozone layer within the stratosphere is useful in that it protects us from incoming UV radiation from the Sun.
True
False
Which of the following images will result in the trapping of ground level ozone? Note that for the two graphs on the left, the horizontal axis shows decreasing temperature towards the left while the vertical axis shows increasing altitude towards the top.
Group of answer choices
Image a
Image b
The World Health Organization recently established a link between poor health and __________
Group of answer choices
Atmospheric nitrogen
Particulate matter
Carbon dioxide
Stratospheric ozone
What is the following figure telling us?
Group of answer choices
Yearly variation in the concentration of atmospheric carbon dioxide over North America
Yearly variation of average temperatures in North America
Yearly variation in the height of the ozone column over Antarctica
Yearly variation of the amount of solar radiation at the equator
Which of the following is NOT considered Anthropogenic pollution?
Group of answer choices
Water vapor
Carbon monoxide
Photochemical smog
Peroxyacetyl nitrates (PAN)
Particulates
Which of the following are considered aerosols?
Group of answer choices
Sulfur dioxide and sulfur trioxide
Volatile organic compounds
Solid particles larger than dust and soot that settle on objects
Small particles of dust, soot, and pollution suspended in the air
Photochemical smog
Earth's primary (first) atmosphere immediately after Earth accretion 4.57 billion years ago was mainly composed of _______________
Group of answer choices
hydrogen and methane
nitrogen and oxygen
carbon dioxide and water vapor
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Related Questions
If you have a gas furnace it is important to make sure that it is tuned up with a proper flow of oxygen. Without a proper flow of oxygen to the furnace, it can burn the natural gas (CH4) with some incomplete combustion. Why can it be so dangerous if your furnace is burning natural gas with incomplete combustion?
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19. The chemical equation for photosynthesis is
_CO2 (g) + _H₂O (1)→ __C6H1206 (s) +
(C6H12O6 is glucose, the simplest sugar)
a. Balance the chemical equation above by filling in the blanks.
b. According to onetreeplanted.org, the average tree (across all climates and sizes) removes 10 kg of
carbon dioxide from the atmosphere every year. Based on this, what mass of glucose is produced
annually by the average tree?
O2 (g)
c. Teak is a common species of tropical tree. The graph below shows the amount of CO₂ absorbed by teak
forests in tons of CO₂ per hectare of forest per year, according to the climate region where the forests
are found (dry = low rainfall, humid=high rainfall). Looking at your photosynthesis equation again, what
does this data suggest about which reactant is the limiting reactant for teak trees? Explain.
C Teak
Carbon sequestration rate (tons CO₂ ha -1yr -1)
10
10
20
Tropical
humid
Tropical
dry
Aboveground biomass,
0-20 years
Belowground biomass,
0 -20 years
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energy source taking into consideration the emission of CO2 for both, which one
will be your candidate as a safer one (with respect to CO2 emissions) if the
quantity of the released energy for the second material is assumed doubled?
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according to e = 0.37 -0.00001p², at what p the efficiency is maximum?
Signature Head of Department
I need a clear
answer by
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2. Cyclopropanol, C3H60
3. C4H9OH
4. C5H12
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1.
atmosphere-rock exchange
2.
atmosphere-ocean exchange
3.
atmosphere-biosphere exchange
A.
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B.
CO2 + H2O → H2CO3
C.
CaSiO3 + CO2 → CaCO3 + SiO2
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C-stay the same
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A-reduction of atmospheric oxygen
B-increase in atmospheric nitrogen
C-reduction in atmospheric carbon
D-increase in atmospheric carbon
3.Which of these processes produces carbon dioxide?
A-photosynthesis
B-burning of fossil fuels
C-animal perspiration
D-planting trees
4. What will be the most immediate effect if many trees are cleared by deforestation?
A-Decreased use of atmospheric carbon dioxide
B-Increased rates of decomposition
C-Increased production of organic compounds
D-Decreased combustion of fossil fuels
5. Only humans can remove carbon from this carbon sink/reservoir.
A-fossil fuels
B-plants
C-atmosphere
D-animals
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Which step should be substituted for the question marks?
2 Hz+ O2→2 H;0
5.0 g 02
1.0 moles 0,
1
31.998 g 02
18 g H,0
A.
1.0 mole 0,
2.0 mole H,0
B.
1.0 mole 0,
18 g H,0
C.
2.0 mole H,O
2.0 mole 0
D.
2.0 mole H, O
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OsH + 1DsM HOsM
ZrO2(s) +
HF() –
ZFF4(s) +
a.
->
b.
Na20(s) +
H2O(1) → _
NaOH(aq) + O2(g)
Al2O3(s) +
SKCH COO
→__
NaOH(aq) –
NasAIO3(aq) +
H2O(1)
С.
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a. 5 x 10^20
b. 5 x 10^21
O c. 5x 10^22
d. 5 x 10^23
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Enter your answer in the provided box.
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Identify the reaction type for reactions #1, #2, and #3.
Large
Element
Element
#:
%232: Hydrocarbon
punodwo)
B.
CO2(g)
(6)2)
Element
→ CO,
Large
Element
(6)o°H +
+.
# 3:
B.
punodwom
Tap below to toggle through answer options and
to identify the reaction type for each of the three reactions.
The type of
reaction for
Reaction #1
The type of
reaction for
reaction for
The type of
Reaction #2
Reaction # 3
is
Decomposition
Combustion
Tap here to select
answer.
+.
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CaCO3 --------> CaO + CO2
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This is an exergonic synthesis reaction.
O This is an endergonic decomposition reaction.
This is an exergonic decomposition reaction.
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How CO2
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can
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3. balanced chemical equation for the single replacement of K + H2O----->
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C)flat breads
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The stirring aerates the water, causing the oxygen to dissolve more easily in the water.
The stirring causes oxygen molecules to leave.
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