Chapter 1, Problem 1.79AE

Which of the following are the same and which are different? a. a substance and a pure substance b. a heterogeneous mixture and a solution c. a substance and a mixture d. a homogeneous mixture and a solution

You receive a mixture of table salt and sand and have to separate the mixture into pure substances. Explain how you would carry out this task. Is your method based on physical or chemical properties? Explain.

The density of manganese is 7.21 g/mL, that of calcium chloride is 2.15 g/mL, and that of sodium acetate is 1.528 g/mL. You place these three solids in a liquid, in which they are not soluble. The liquid has a density of 2.15 g/mL. Which will sink to the bottom, which will stay on top, and which will stay in the middle of the liquid?

A pharmacy technician is asked to dispense 250ml of solution which contains 0.05g/5ml of drug. How many milligrams of drug is needed to meet the needs of this prescription?

A certain antihistamine is often prescribed for allergies. A typical dose for a 100​-pound person is 20 mg every six hours. Complete parts​ (a) and​ (b) below.   a. Following this​ dosage, how many 12.1 mg chewable tablets would be taken in a​ week? b. This antihistamine also comes in a liquid form with a concentration of 12.1 ​mg/9 mL. Following the prescribed​ dosage, how much liquid antihistamine should a 100​-pound person take in a​ we

What is the density of a solution with a mass of 116.1 ± 0.2 g and a volume of 96.3 ± 0.4 mL?

A chemist must prepare  550.mL  of  60.0mM aqueous potassium dichromate  K2Cr2O7 working solution. He'll do this by pouring out some  0.403molL aqueous potassium dichromate stock solution into a graduated cylinder and diluting it with distilled water. Calculate volume in mL of potassium dichromate stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits.

Choral hydrate, a sedative and sleep-inducing drug, is available as a solution labeled 10.0 gr/fluidram. What volume in milliliters should be administered to a patient who is meant to receive 7.5 grains per dose? (1 gr = 64.8 mg; 1 fluidram = 3.72 mL)

The density of manganese is 7.21 g/mL, that of calcium chloride is 2.15 g/mL, and that of sodium acetate is 1.528 g/mL. You place these three solids in a liquid, in which they are not soluble. The liquid has a density of 2.15 g/mL. Which will sink to the bottom, which will stay on the top, and which will float in the middle of the liquid?