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Total questions: 27
Worksheet time: 7hrs 45mins
The majority of GHG emissions are associated with burning fossil fuels for energy with larger amount associated with land use
True
False
TDS stands for Total Dissolved Solids, which refers to the concentration of dissolved substances in water and is commonly used to assess water quality.
True
False
Which compounds are summed to calculate the Total Dissolved Solids (TDS) in water?
All ions and dissolved organic materials
Only salts like NaCl and KNO₃
All dissolved inorganic ions like Na⁺, Cl⁻, Ca²⁺, Mg²⁺, HCO₃⁻, SO₄²⁻, etc.
Only bicarbonates (HCO₃⁻) and carbonates (CO₃²⁻)
CSTR stands for Continuous Stirred Tank Reactor, a reactor type where contents are mixed uniformly and is commonly used in chemical and biological processing.
True
False
VOC stands for Volcanic Organic Carbon, a naturally occurring compound measured in volcanic ash.
True
False
VSS stands for Volatile Suspended Solids, which are used to estimate the organic portion of suspended solids in wastewater.
True
False
In the Michaelis-Menten Equation:
V = (Vm × S) / (Km + S)
What does Vm represent?
The substrate concentration at half the reaction speed
The maximum reaction velocity
The molecular volume
The minimum activation energy
Biological Oxygen Demand (BOD) is an indicator of:
The level of biological nutrients in the soil
The need for biodiversity in oceans
The amount of oxygen needed by microorganisms to decompose organic matter
The chemical demand of oxygen
It is predicted that the likely range of temperature increases in the next century
will range from 2.4ºC to 5.4ºC.
True
False
The Plug Flow Reactor (PFR) assumes
Complete mixing at all times
No mixing in the direction of flow, but perfect mixing in cross-sections
Instantaneous reaction
Constant temperature without flow
What does Global Warming Potential (GWP) measure?
The amount of CO₂ removed from the atmosphere by trees
The heat-trapping ability of a greenhouse gas compared to carbon dioxide
The total greenhouse gas emissions from fossil fuel combustion
The temperature increase per year due to global emissions
Balance the equation
4Fe(OH)₃ + 3H₂SO₄ → 2Fe₂(SO₄)₃ + 6H₂O
2Fe(OH)₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 6H₂O
Fe(OH)₃ + H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O
2Fe(OH)₃ + 3H₂SO₄ → 2Fe₂(SO₄)₃ + 4H₂O
4Fe(OH)₃ + 2H₂SO₄ → Fe₂(SO₄)₃ + 4H₂O
Balance the equation
2Na₂CO₃ + 3H₃PO₄ → 2Na₃PO₄ + 3CO₂ + 3H₂O
3Na₂CO₃ + 2H₃PO₄ → 2Na₃PO₄ + 3CO₂ + 3H₂O
Na₂CO₃ + H₃PO₄ → Na₃PO₄ + CO₂ + 2H₂O
Na₂CO₃ + 2H₃PO₄ → 3Na₃PO₄ + 3CO₂ + 3H₂O
2Na₂CO₃ + H₃PO₄ → 2Na₃PO₄ + CO₂ + 3H₂O
Balance the equation
3CuSO₄ + 2H₃PO₄ → Cu₃(PO₄)₂ + 3H₂SO₄
3CuSO₄ + 2H₃PO₄ → Cu₃(PO₄)₂ + 3H₂SO₄
3CuSO₄ + 2H₃PO₄ → Cu(PO₄)₂ + 2H₂SO₄
CuSO₄ + H₃PO₄ → Cu(PO₄) + H₂SO₄
3CuSO₄ + H₃PO₄ → Cu₃(PO₄)₂ + 3H₂SO₄
A dissolved pollutant in a lake undergoes first-order decay with a rate constant of 0.30 hr⁻¹. What is the half-life of this reaction?
2.31 hr
1.59 hr
C) 1.00 hr
D) 2.00 hr
A pesticide in runoff follows second-order degradation with a rate constant of 10 m³/kg·hr. If its initial concentration is 0.02 kg/m³, what is its half-life?
5.0 hr
2.5 hr
1.5 hr
0.5 hr
An industrial chemical is spilled into a storage pond, and degrades at a constant rate of 3 mg/L·min. If the initial concentration is 150 mg/L, how long will it take for the concentration to decrease to 15 mg/L?
35 minutes
45 minutes
50 minutes
60 minutes
A power plant burns 1 kilogram of coal with a heating value of 32 MJ/kg to produce 3.5 kWh of electricity. What is the efficiency of this process?
31.45%
39.38%
46.79%
54.28%
What is the mass of 100 mL of benzene?
(SG benzene = 0.879)
30.0 g
43.95 g
79.5 g
87.9 g
Which of the following ions are primarily responsible for calculating water hardness?
Ca²⁺, Mg²⁺, and Fe³⁺
Fe²⁺ and HCO₃⁻
Na⁺, Ca²⁺, and SO₄²⁻
Ca²⁺, Mg²⁺, and Na+
On a warm day in São Paulo (T = 30°C, P = 1 atm), the ozone (O₃) concentration is 0.300 mg/m³. What is the O₃ concentration in μg/m³?
Use R = 8.205 × 10⁻⁵ atm·m³/mol·K and molar mass O₃ = 48 g/mol
0.3 μg/m³
3 μg/m³
30 μg/m³
300 μg/m³
What is the O₃ concentration in ppbv under the same conditions? (T = 30°C, P = 1 atm)
Use R = 8.205 × 10⁻⁵ atm·m³/mol·K; Molar mass O₃ = 48 g/mol; Concntration 300 μg/m³
0.155 ppbv
15.5 ppbv
155.3 ppbv
300 ppbv
How many moles of O₃ are there per 10⁶ moles of air?
Ratio: 1.543 × 10⁻⁷
0.154
1.54
15.4
154
A sample of water has a pH of 7.4, total alkalinity as CaCO₃ = 150 mg/L, and the following ion concentrations.
What is the total hardness as CaCO₃ in mg/L?
201.3 mg/L
204.5 mg/L
205.1 mg/L
210.2 mg/L
A sample of water has a pH of 7.4, total alkalinity as CaCO₃ = 150 mg/L, and the following ion concentrations.
What is the concentration of carbonate ion (CO₃²⁻) in mg/L?
10 mg/L
20 mg/L
30 mg/L
40 mg/L
A sample of water has a pH of 7.4, total alkalinity as CaCO₃ = 150 mg/L, and the following ion concentrations.
What is the noncarbonate hardness in mg/L?
24.73 mg/L
54.41 mg/L
73.92 mg/L
84.65 mg/L
A sample of water has a pH of 7.4, total alkalinity as CaCO₃ = 150 mg/L, and the following ion concentrations.
What is the total dissolved solids (TDS) in mg/L?
215mg/L
225mg/L
237mg/L
245mg/L
