EVE 302 EXAM 1

Toluene (10 ug) is added to 2L of water. Calculate the toluene concentration in ppmm. Because the toluene concentration is very low, you may assume that the density of the solution is equal to that of water (1000 g/L).

0.005 ppm 10g T/2L sol = 5g Toluene/L sol. (5ug/L) x (1L/1000g) x (1g/10^6 ug) x (1ppm/1ug/10^6ug) = 0.005 ppm

Chemical Pollutants in Air (and their effects)

1. PM (impairment of respiratory system) 2. SO2 (dissolution of metals) 3. NO2 (dissolution of metals) 4. O3 (forms ground level ozone causing damage to lungs and crops) 5. CO (CO poisoning) 6. Pb (damage to kidneys/ developmental issues in children)

Name one concrete way that you, as an individual, can reduce your discard rate of solid waste.

1. use reusable grocery bags and water bottles 2. compost food scraps 3. buy secondhand items and donate goods

A 100-mL sample of water is filtered through a 0.45-um filter; the filter and its retained solids are dried to a constant weight in an oven. The filtrate is added to a crucible, and these are dried to a constant weight in an oven. Calculate TDS (mg/L) for this sample. Mass of filter paper: 1.3257 g Mass of filter paper + retained solids (after drying at 103 oC): 1.3293 g Mass of crucible: 5.5000 g Mass of crucible + solids (after drying at 103 oC): 5.5376 g

376 mg/L 5.5376 g - 5.5000 g = 376 mg/L

What is CO2 sequestration, and why is it an important topic of research?

CO2 = the most commonly produced greenhouse gas CO2 sequestration = process of capturing/ storing atmospheric carbon dioxide IMPORTANT: reducing atmospheric CO2 means reducing global climate change

The PM10 standard was set because particulate matter > 10 um can easily be deposited in the alveoli of the human lung. True/False??

FALSE Particulate matter LESS THAN 10 micrometers can easily be inhaled into the lungs.

Two key characteristics of a "dead zone" in a surface water are a high dissolved oxygen concentration and a small (or non-existent) community of aquatic animals. True/False

FALSE low oxygen level and no/little life

In MATLAB, [1; 2; 3; 4] is the same as [1, 2, 3, 4].

FALSE semicolons and commas are NOT the same

Ambient air refers to both indoor and outdoor air. True/False

False Ambient = outdoor

The U.S. EPA administrator is appointed by the EPA Board of Directors. True/False??

False The US EPA admin is appointed by the US President (Current admin=Micheal Regan)

A water contains 2 M Cl and 1 M Mg . The normality (N) of Cl is greater than/less than/equal to the normality of Mg2+ in this solution.

Normality (N) (eq./L)

The equivalent weight of HSO4- (where Z is assigned based on the charge of this ion) is ______________________ g/eq.

Z calculation: Z= eq/mole = charge of ion ex: Ca2+ Z=2 Equivalence Weight (EW) (g/eq.): mm(molecular weight)/Z EW of Ca2+ = (40g/mol)/2 = 20g/eq.

If I type the following into the command window, what will appear in the command window afterward? a=linspace(0,10,6)

a = 0 2 4 6 8 10

If you generate hazardous waste as a private individual in the United States, what should you do with it? (Example: You change the oil in your car, and you are left with exhausted motor oil.)

common hazardous household wastes: paints, motor oil, batteries, cleaners Improper Disposal: pouring down the drain, on the ground, pouring down storm sewers or into trash Dangers: danger to human health and pollution to environment Solution: Read product container for specific disposal instructions, never put in food storage containers, research collection programs for HHW near your community

The molarity of water is closest to which of the following? (a) 18 (b) 999 (c) 24.5 (d) 55.6

d) 55.6 M Molarity=moles/Liter H2O mm= 18g/mole 1L h2O= 1000g H2O 1000/18 = 55.5555 mole/L H2O

Name one action that you can take to reduce light pollution.

dimmers/ timers or switching to LED lights

In terms of ambient air quality, __________________________ is an example of a stationary source of particulate matter and ______________________ is an example of a mobile source of particulate matter.

facilities/ manufacturing plants = stationary source planes = mobile source of air pollution

Gas phase pollutant concentrations are typically specified in volume ratios/mass ratios.

gas phase = vol./vol.

>>

in the command window

You have collected a sample of contaminated air emitted from an industrial process to determine the concentration of benzene in the waste air stream. After analyzing the sample, you have a choice of reporting your contaminant concentration in units of ug/m3 or in units of ppmv. If the temperature and pressure of the contaminated air stream are constantly changing, which units would you use to report your result?

ppm ; This is so you can see the difference if the data is constantly changing

If I type the following in the command window, what will show in the command window after execution? x=2; y=x+9

y= 11

According to the ideal gas law, the pressure and volume of an ideal gas are directly/inversely proportional.

Inversely Ideal Gas Law: PV=NRT Variables on the same side of equal sign are inversely proportional (ie. pressure and volume) Variable on opposite side of equal sign are directly proportional (ie. pressure and temperature)

1 ppbm is greater than/ less than/ equal to 1 ug/g

LESS THAN

Which of the following air pollutants can lead to dissolution of outdoor metal statues? CO/CO2/NO2/SO2

NO2 and SO2 NO2 and SO2 mis to form sulfuric acid which is present in acid rain (ex: Statue of Liberty in NY)

When sodium chloride (NaCl) is dissolved in phenol, NaCl is the solute/solvent and phenol is the solute/solvent.

NaCl=solute phenol=solvent SOLUTE is dissolved in SOLVENT to produce a SOLUTION

If I type the following in the command window, what will appear in the workspace? x=[2 2 2]; y=[4 1 3]; z=x.*y

Name Value X [2 2 2] Y [4 1 3] Z [8 2 6]

If I type the following in the command window, what will appear in the workspace? %{ m=3 n=4%} %o=5 p=6

Name Value p 6

If I type the following in the command window, what will show in the workspace? x=2; y=x+9

Name Value x 2 y 11

greenhouse effect

Natural situation in which heat is retained in Earth's atmosphere by carbon dioxide, methane, water vapor, and other gases

US EPA: What two types of standards exist and what are their goals?

Primary: protect human health Secondary: protect public welfare (damage to crops/ vegetation)

An ambient air pollutant that causes only decreases in visibility is likely to be regulated with a primary/secondary standard, whereas an ambient air pollutant that causes only human lung damage is likely to be regulated with a primary/secondary standard.

Secondary standard = loss of visibility Primary standard = damage to human health

The three systems shown below are each contaminated with 200 ppm of the chemical Zypan. The molecular weight of Zypan is 90 g/mole. SYSTEM 1: Sealed Tank Full of Soil Soil Density: 1600 kg soil/m3 soil Volume of Soil Tank: 100 L Czypan in soil = 200 ppmm SYSTEM 2: Sealed Tank Full of Water Volume of Tank: 200 L Czypan in water = 200 ppmm SYSTEM 3: Sealed Tank Full of Air Volume of Tank: 500 L Czypan in air = 200 ppmv T =25 oC, P =15 atm Based on the information above, determine the total mass of Zypan in each system (in g). You may assume that the density of the aqueous solution is 1000 g/L.

Soil: 32 g; Water: 40 g; Air: 5.52 g

The United States EPA periodically considers the regulation of new drinking-water contaminants. True/False

TRUE (re-evaluate every 5 yrs)

In MATLAB, [1 2 3 4] is the same as [1, 2, 3, 4].

TRUE commas and spaces are the same

Both human health and wildlife health can be negatively affected by light pollution. True/False

TRUE light pollution effects melatonin levels in wildlife, confuses 24-hr circadian rhythm, affects migration patterns

In MATLAB, ["a"] is the same as ['a'].

TRUE you can use both ' or "