If 150 g of phenacetin were dissolved in 100 ml of water, how much ether would be required to extract 90% of phenacetin in a single extraction?

What is responsible for the whistling sound that often accompanies firework?

A 50.6 grams sample of magnesium hydroxide (Mg (OH) 2) is reacted with 45.0 grams of hydrochloric acid (HCl). What is the theoretical yield of magnesium chloride (MgCl2) ? Mg (OH) 2 + 2 HCl MgCl2 + 2 H2O

What role does heat energy from the sun play influencing ocean currents

To identify a liquid substance, a student determined its density. Using a graduated cylinder, she measured out a 45-mL sample of the substance. She then measured the mass of the sample, find ing that it weighed 38.5 g.

A homogeneous mixture that does not settle out upon standing but will reflect light is a. an element. b. a colloid. c. a suspension. d. solid. e. hydrated.

What is the mass of 1.0 x 10-3 mole of Zn? 3.9 x 1022 0.065 0.000015

How do you convert the number of molecules of a substance to the number of moles? a. add Avogardo's number b. subtract Avogardo's number c. multiply Avogardo's number d. devide Avogardo's number

Sodium and chlorine can bond together. sodium gives chlorine a needed electron. what is chlorine's charge after accepting the electron?

What astronomical equiptment did hypatia use?

Name each activity or observation as either physical or chemical change. 1) Boiling water for pasta 2) Digesting food 3) Soda goes "flat" 4) Stretching a rubber band 5) Grilling a hamburger 6) Adding sugar to tea 7) Adding lemon to tea 8) Mowing the