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CFCs were used in hair sprays, air conditioners, refrigerators, and plastic foams. Which properties of CFCs made them desirable for the uses?
Coal can be used to make hydrogen gas (a potential fuel) by given endothermic reaction. If the reaction mixture is at equilibrium, forecast effect (shift right, shift left, or no effect) of adding mo
HNO3 concentration by mass and density of 1.41 g/mL. How much of concentrated solution in milliliters must you use to make 2.5L of 0.500 M HNO3?
If 84.8 L of 02(g), measured at 35C and 632mm Hg, is permitted to react with 158.2 g of NO, determine limiting reagent. If 97.3 L of NO2 forms, measured at 35C and 632mm Hg, find the percent yield?
Explain the difference between "crystal lattice", arrangement of lattice points in space, and "crystal structure", arrangement of atoms in space.
Explain the importance of a limiting reactant? Explain how it is found and what it tells us about amount of product that can be formed.
The Ksp for magnesium fluoride is 3.7 x 10-8. Equilibrium is: MgF2(s) ? Mg2+ + 2F-. compute the solubility of magnesium fluoride in mol/L.
NO2 reacts with F2 to give NO2 according to the given overall reaction: Find equilibrium constant for this reaction given.
Describe how society depends on accuracy and precision of measurements for products sold by retail industry, like a gallon of gasoline, a bushel of corn, or liter of bottled water.
The chemical formula of hemoglobin is C2952H4664O832N812S8Fe4. Compute formula mass of hemoglobin. Calculate generated model of hemoglobin.
Balance equation in acidic solution and find out how much of 0.850 M K2Cr2O7 solution is needed to completely dissolve 5.25 g Cu .
Which of the given reactions are redox reactions? For those reactions which are redox reactions, recognize substance being oxidized and substance being reduced.
Compute CEC and compare with measured CEC. Recommend reason why two values may be different. Compute SAR and evaluate SAR from exchangeable cation data.
A NC Coastal Plain organic soil has the pH of 4.5 and a CEC = 30 meq/100g. Determine lime rate that would you suggest? A dealer sells 80% CCE lime with the characteristics.
Determine the ESR of this soil? Find out amount of CaSO4·2H2O needed to decrease exchangeable Na+ to 5% in surface foot of soil.
Compute gypsum required (lbs/A-ft) to amend this soil. Find minimum quantity of lime soil should contain to use S as amendment (express as %CaCO3)?
Does soil contain sufficient lime to decrease ESP to 5% if S were used instead of gypsum? How much S (lbs/afs) is required to decrease ESP?
Compute lbs Ca in 1000ft2 (9 inches deep) golf green (1.1 g/cm3 bulk density). Compute grams of Ca in a 2 kg container pot.
Compute the meq/100 g of each cation and percent base saturation of the soil. Compute the percent acid saturation.
The given cations were extracted from 100 g soil with at CEC of 20 meq/100g. Compute % base saturation of soil.
Soil is 75% saturated with Ca+2 + Mg+2 + K+. 50 g of the soil is titrated with 20 ml of 0.1 N NaOH. Compute the CEC.
50 g of soil is extracted with NH4Cl (ammonium chloride) and extract diluted to 0.5 liter. Soil pH is 7.5. Was the estimate of CEC good estimate? Why or why not?
If temperature of mixture is 25oC, will it be possible to discharge all waste into river within a 7--day period if river pH should be maintained above 7.0?
Determine the pH of the water after CO2 removal? Suppose water temperature remains at 10oC and that ionic strength corrections can be neglected.
Find molarity of solution prepared by diluting 49.5 mL of 2.09 M AgNO3 to final volume 82.6 mL? Compute the final answer to 2 decimal places.