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In parts of the midwestern United States, sirens sound when a severe storm that may produce a tornado is approaching. Mandy is walking at a speed of 1.47 m/s directly toward one siren and directly away from another siren when they both begin to sound with a frequency of 700 Hz. What beat frequency does Mandy hear? (Assume a temperature of 20° C.) Hz
calculate the mass of silver chloride and dihydrogen monosulfide h2s formed when 85.6g of silver sulfide reacts with
Why does absorbance vs concentration calibration curve need not pass through origin (0,0) looking at beer lambert law?
How much heat in kilojoules is required to warm 10.0 g of ice, initially at -10.0^\circ C, to steam at 110^\circ C. The heat capacity of ice is 2.09 {\rm J}/{\rm g} ^\circ {\rm C} and that of steam is 1.84
Calculate oxalate ion in the resulting solution. volume change is negligible Calculate the Kb for the reaction that occurs when solid sodium oxalate is dissolved in water
A hot-air balloon has a volume of 875 L. What is the original temperature of the balloon if its volume changes to 955 L when heated to 56 degrees celcius
Ethanol melts at -114 C and boils at 78 C. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/g.K and 2.3 J/g.K, respectively.
The triprotic acid H3A has ionization constants of Ka1 = 7.5× 10-2, Ka2 = 7.8× 10-9, and Ka3 = 6.9× 10-12. Calculate the following values for a 0.0580 M solution of NaH2A Calculate the following values for a 0.0580 M solution of Na2HA.
Write an equation, clearly showing the stereochemistry of the starting material and the product, for the reaction of (S)-1-bromo-2-methylbutane with sodium iodide in acetone.
The CaC2O4*H2O precipitate is not completely air-dried when its mass is determined. Will the reported mass of the limiting reactant in the original salt mixture be reported too high or too low
A system consists of 6.00 moles of benzene. It is initially at a temperature of 76.0°C, a pressure of 0.878 bar, and a volume of 534.7 cm3. Calculate the volume of the system at the end of this process.
An empty gasoline can with dimensions 15 cm by 40 cm by 12.5 cm is attached to a vacuum pump and evacuated. if the atmospheric pressure is 14.7 lb/in^2.
Analysis of the products revealed two methylated sugars: 2,3,6-tri-O-methyl-D-glucose, 2,4-di-O-methyl-D-glucose and 2,3,4,6-tetra-O-methyl-D-glucose. The ratio of these sugars was 20:1:1. determine the structure of the polysaccharide?
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