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Question- Joseph places a glass containing 200 grams of water at 20 degrees Celsius into a refrigerator. It then loses 11.7 kJ as it cools to a constant temperature. What is the new temperature?
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State a chemical equation for the synthesis of ethyl 2-methylpropanoate. Utilize structural formulas including all the CH3, CH2, etc. details for each organic compound in your equation. Also, name each reactant.
A student carried out a recrystallization and obtained a 105% yield of material with a broad melting point. The material was warmed gently resulting in a recalculated yield of 87% and a sharper melting point. Briefly explain these observations.
a corrosion technologist pipetted a 100.00 ml hard water sample and titrated it with 37.64 ml of 0.01 m edta solution
Lithium will react with oxygen in a pressurized container to produce solid lithium oxide at 25°C. if 0.130 g Li(s) is placed in a 0.500 L container filled with oxygen at 1.90 atm
Formic acid, CH2O2, can be decomposed to produce hydrogen. The Lewis structure for formic acid, CH2O2, is show below. The atoms are labeled A, B, C, D, E.
Presume that the initial volume of the HA solution equals the volume of water utilized to dissolve you solid acid HA a) using the value of ka from your titration curve, Compute the pH at the equivalence point
How many grams of NH3 can be produced from 4.55mol of N2 and excess H2. How many grams of H2 are needed to produce 11.52g of NH3
Calculate the amount of solution (g or mL) that contains each of the following amounts of solute. Express your answer to 3 significant figures and include the appropriate units.
To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule
245.0 nm ultraviolet light strikes a metal plate and ejects electrons having kinetic energy E = 1.79 eV. Calculate the binding energy of an electron at the metal surface.
FE3+ SCN FeSCN2, how will adding potassium thiocyanate (KSCN) initially change [Fe^3+], [SCN], and [FeSCN^2+). how should equilibrium system respond to the change
The isolated (S)-(-)-enantiomer was distilled in vacuum to give 1.5 g of pure amine. Calculate the yield of (S)-(-)-alpha-methylbenzylamine.
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