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Amina G.
PhD student in STEM
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Basic Chemistry
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Question:

Is HNO3 an acid or base? Also, is it strong or weak? HNO3 is a strong acid (nitric acid).

Amina G.

Is the combustion of natural gas endothermic or exothermic? Which has a greater heat content (enthalpy), reactants or products? exothermic. reactants

Environmental Engineering
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Question:

A residential development of 320 houses is being planned. For planning purposes an average daily consumption of 120 gpcd is used. Estimate the average daily volume of water that must be supplied to this development if each house is occupied by 4 people. Use your units: (320 houses)(4 people/house)(120 gallons/capita/day) = 153,600 gallons/day

Amina G.

If a steady rain of 0.33 in/h falls on a parking lot with an area of 65,340 ft^2 and a runoff coefficient of 0.85, what is the estimated peak discharge? First, convert ft^2 to acres: 65,340 ft^2 / 43,560 ft^2/acre = 1.50 acres Use Q = CiA, where C=runoff coefficient, i = rain intensity/precipitation, A = area Q = (0.85)(0.33 in/hr)(1.50 acre) = 0.42 ft^3/s

Algebra
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Question:

For what value of the constant "t" does the equation 2x + tx = 3 have one solution? (2 + t)x = 3 --> x = 3/(2+t) --> t must be any real number except -2 since t = -2 will create an undefined solution.

Amina G.

Tim's annual salary after a raise of 15% is 45,000. What was his salary before the 15% raise? 45,000 = x(1 + 0.15), where x is Tim's salary before the 15% raise --> x = 45,000/1.15 = 39,130

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