You have identified your product to be butylnapthyl ether and recrystallize it. The initial mass of the the crude ether was 141 mg. The mass after recrystallization was 121 mg. Calculate the percent recovery from recrystallization.

Which of the following is an example of a scientific model? The total inches of rainfall during a thunderstorm A telescope used to study the stars A computer program that simulates atmospheric conditions A song about the Grand Canyon

Charlie took 8 minutes to run a mile. His sister, Christina, took 13 minutes to run a mile. Which of the following is true?

How many grams of calcium chloride will be produced when 29.0 g of calcium carbonate is combined with 15.0 g of hydrochloric acid?

What is a MSDS? A document that identifies chemical hazards associated with compounds. Part of a Biosafety manual. Identifies all chemical reactions. Outlines calibration standards.

How much energy is released when 37.8 g of water freezes? the heat of fusion for water is 6.02 kj/mol. the amount of heat energy released = kj?

For the separation of the unknown mixture, you are instructed to isolate the amine followed by the acid and finally the neutral. Does the order matter? If not, what other orders could be followed?

As ice melts and changes from solid to liquid, A) entropy increases. B) kinetic energy decreases. C) an exothermic reaction occurs. D) the random movement of molecules remains constant.

What volume of 0.480 m koh is needed to react completely with 15.8 ml of 0.150 m h2so4? assume the reaction goes to completion?

Which sample of water contains particles having the highest average kinetic energy?

Use the terms magnetic field and magnetic pole in a sentence