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A careless student, Will Bobble, misread the label on a bottle of 10 M sodium hydroxide and used it (rather than 1 M NaOH) to dissolve his vanillin. Then he stored the solution and left the lab early to catch a ride home. During the next lab period, he added NaBH4 and finished the experiment. Although his product was a white solid, it melted over a broad temperature range that was much lower than the melting point of vanillyl alcohol. His instructor suggested washing the product with dilute sodium bicarbonate; when he did so, about half of the product dissolved and the remainder melted at 115 degrees C. Explain what happened and write an equation for the reaction.
The solubility of a certain compound in ice-cold water is .19g in 100mL. its solubility in hot water is 3.35g in 100mL.
One mole of an ideal gas is subjected to the changes below. Calculate the change in temperature for each case
what would the concentration of copper be in a solution created by combining 10ml of it with 10 ml of the 0.100M copper (II)sulfate solution?
A sample of chlorine gas at a pressure of 420 mm Hg and in a volume of 3.50 L was heated from 18.0oC to 45.0oC after being transferred to a container of volume 2.35 L. The pressure in this new container should be about
A 10.0 mL aliquot of the solution is titrated with a standard 0.101 M KSCN solution, requiring 7.0 mL to reach the red Fe(SCN)2+ end point. Calculate the percent mass of silver in the sample.
If a particular alloy is prepared by mixing 11.2 moles of copper with 1.5 moles of nickel, what is the mass percentage of nickel in the alloy
Identify the incorrect names or formulas.
What is the molarity of the stock solution of luminol? What volume of the stock solution (Part A) would contain the number of moles present in the diluted solution (Part B)?
A. Epinephrine, C9H13NO3, has a concentration of 10-10 M in circulating blood. Calculate the diameter of a round swimming pool with a water depth of 2.0 M that would be needed to dissolve 1.0 g (about a teaspoon) of epinephrine.
If an unknown forms a silver mirror in the Tollens test, forms a purple color in the Schiff test, produces no precipitate in the iodoform test, has a refractvie index of 1.5250, and forms a semicarbazone melting at 124-126 C
A reaction has an activation energy of 40 kJ/mol. What happens to the rate if you increase the temperature from 70 C to 80 C? Does the rate increase by
When a sample of PCl5(g) (0.1612 mol/L) is placed in 35.00 L reaction vessel at 878.0 K and allowed to come to equilibrium the mixture contains 3.122 mol of PCl3(g)
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