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1. A balance is checked and found to be accurate and clean. After the lab, a spilled white solid is found on the balance. The only white substances available in the lab were barium chloride and sodium sulfate. Outline a procedure to determine which of the solids has been spilled. Why is it important to know which of the 2 solids is on the balance before the spill is cleaned up?
2. Some dust from a shoe print at a crime scene is dissolved in nitric acid and analyzed. The flame test is inconclusive, yielding a brick orange flicker followed by more yellow long--lasting flame, but the dust sample yields a white precipitate when heated with ammonium oxalate. The silver nitrate test is negative with no precipitate forming, but a follow up barium chloride test yields an insoluble precipitate. From this data, the investigator concludes tht trces of gympsum are on the shoes and the wearer of the shoes has had a recent association with some type of construction or building supply. Gypsum is a major component of many dry wall products. From the above lab data, what are the names and formulas of the 2 ions present in gypsum.
Typical rate of deposit of dust (dustfall) from unpolluted air was reported as 10 tons per square mile per month. Express this dustfall in milligrams per square meter per hour.
What is the mechanism of the synthesis of the dye para red from anilin?
The thermal decomposition of phosphate into phosphorous and molecular hydrogen is a first order reaction : 4PH3(g) -----> P(g) + 6H2(g), The half life of the reaction is 35.0 s at 680*c
After losing the electron, how many protons will Na have in its nucleus? Sodium (Na), atomic number 11, has a tendency to lose an electron in the presence of chlorine
Determine what is the percent yield of the reaction If 15.0 grams of Nitrogen and 2.00 grams Hydrogen react to produce 1.38 grams of Ammonia?
Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more complicated, but this is a reasonable first approximation.)
How much does the molar enthalpy change when 147 g. of water cools from 90.0 C to 17.0 C when 20.0 g. of KCL is added to the water? Is this reaction exothermic or endothermic?
Draw a phase diagram labeling all the above points. Also label the melting point curve, the boiling point curve, and the solid, liquid, and gas regions.
What volume of oxygen is required to burn completely 401 cm3 (centimeters cubed) of butane, C4H10 (All substances are gases measured at the same temperature and pressure.)
the equilibrium mixture is compressed at constant temperature to a volume of 6.21 L? [NH3] = [H2S]=
Chemistry - Estimation of Mass Required in a Reaction, With the reaction, CaCO3+2Hcl->CaCl2+H2O+CO2. Using percent by mass what is the weight of HCl needed to react
Determine the mass, of: a.30.0 mL of the liquid propylene glycol, a moisturizing agent for foods,
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