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A forestry surveyor walked 2.0 km east, then 2.6 km south, then 9.7 km 31° to the south of due east. What was the direction, expressed as standard angle (), of her total displacement over the entire trip in degrees? Express your answer in degrees to one decimal place (do not include units in your answer).
How many inner, outer, and valence electrons are present in an atom of each of the following elements
a polypeptide is subject to the following degradative techniques resulting in polypeptide fragments with the indicated
Suppose .050 moles of a substance reacts in 25.0 grams of water. If the water temperature goes from 22 degrees C to 26 degrees C, how much heat was given off. How much heat would be given off if one mole of the substance reacted
determine the volume of .450m napo4 is needed to precipitate all the leadii ions from 190.0ml of .550m leadii
the second contains 0.1 mol Na2S , and the third contains 0.1 mol CaCl2 . What net ionic equations for the precipitation reaction or reactions that occur. What are the spectator ions in the solution
Calculate the work done (in Joules) when 1 mole of ideal gas at 2 bar pressure and 300 K is expanded isothermally to a pressure of 1.5 bar, with the external pressure held constant at 1.5 bar.
Iodine-131 decays to produce xenon-131. Which type of nuclear radiation is emitted in this reaction
A solution is prepared by mixing 5.00 grams of compound Z (molar mass is 15.00 g/mol) in 100.0 mL of water. The density of the solution is 1.08 g/mL. Calculate the molarity of the solution.
Define what is the freezing point of a solution (in degrees Celsius) prepared by dissolving 50g of glycerin (C3H8O3) in 200g of ethanol (C2H5OH), which has a freezing point at -114.6 degrees Celsius, (Kf= 2.00 degrees Celsius/mol). Explain which l..
By how much will the pH change if 0.025 mol of HCl is added to 1.00 L of the buffer that contains 0.15MHC2H3O2and 0.25MC2H3O2-? UseKa= 1.8 × 10-5for HC2H3O2.
Which of the following statements concerning fatty acids is incorrect. Fatty acids are rarely found free in nature
Since you need pressure based constant use ideal gas equation (PV=nRT) to convert moles of gas into pressure with units of atmospheres. R=0.0821 L atm/mol K
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