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Why might this fire rekindle days later as someone tries to remove the residue with water? What chemical process is involved here?
A new global sustainable business and industry incubator network is expanding into a Paris suburb.
What is the greatest current threat(s) to U.S. farmlands, and what are some possible solutions to it(them)?
You use a properly calibrated explosimeter to measure the flammable hazard inside a tank that contained toluene and may still have some residual product.
Discuss two ways that ammonium compounds decompose when they are heated. What chemical reaction is involved in the thermal decomposition of ammonium persulfate?
What economic impact was generated by the law? What kinds of costs, fines, or economic benefits are associated with the law?
Your metropolitan area has been warned by the EPA to lower sulfur dioxide and nitrogen oxide emissions or it will lose substantial federal funding.
If a piece of Calcite (Calcium Carbonate) is put into the lake, would it tend to dissolve? Calcium carbonate solubility is 10^-8.35 M2.
For HCN in water, Ka = 2.0E-10. Calculate the fraction of cyanide that exists as the anion rather than in the molecular form at pH values of 4, 7, and 10.
Calculate the amount of calcium carbonate (mg) dissolved per liter of rainwater. pKa1=6.33, KCO2=3.388e-02
A water sample has a pH of 8.21 and a total calcium concentration of 143 ppm.
Coal combustion can affect freshwater or marine (saltwater) organisms in different ways.
Describe the 4 phases of demographic transition, including if the population is stable, growing, or declining in each. ·
What mass of lead would potentially be recovered from a crop planted on one square kilometre of soil with 280 ppm lead?
Assume a constant temperature of 298 K and that the volumes of the two solutions are additive.
The crystal field splitting energy for TiF6^-3 is 203 kJ/mol. At what wavelength does the maximum absorbance of light occur for this complex?
The formation constant for Cu(NH3)4(exponent 2 positive) is 2x10(exponent 12). What is the ratio of Cu(NH3)4(exponent 2 positive)
For AgCl, what will occur if 250ml of 1.5 A 10^-13 M of NaCl is mixed with 250mL of 2.0 A 10^-7 M of AgNO3?
Write a balanced net ionic equation for the reaction of each of the following compounds with water.
How much MnO2 should be added to excess HCl to obtain 275mL of chlorine gas at 5.0C and 650 mmHg?
The question arises concerning the density of saltwater: is it because water molecules have moved out of the system, replaced by sodium and chlorine ions.
Each row across the periodic table is called a period and the elements gradually change properties from left to right.
Determine the number of moles and percent by weight of sodium perborate and sodium carbonate in a given sample of Purex.
Write and balance the equation for the disproportionation of sulfite (SO32-) into sulfate and sulfide ions in basic solution.
Rank the following species from the strongest reducing agent to the strongest oxidizing agent: SO42-, SO32-, O3SO2SO32-.