Chapter 1, Problem 1.89E

A sample sodium is being dried. After 1 hour drying, the mass of the sample was 0.337g. After an additional 30 minutes of drying, the mass of the sample is 0.333g. What is the percent change between the first and second meaasurement? if to be considered "dry", two consecutive measurements must have a percent change <_ +- 1%; is the sample dry?

is cutting a cake a physical or chemical reaction?

Liposuction is a technique for removing fat deposits from various areas of the body. How many gallons of fat would have to be removed to result in a 10 pound weight loss. The density of human fat is 0.94 g/mL

A medium sized carrot weight 61 g and contains 6 g of carbohydrate. What percent by mass of the carrot is carbohydrates

You are asked to prepare an injection containing 1 vial of vaccine. The vial contains 12.5 mg of Tice BCG, and is then diluted to 50 mL with sterile physiological saline. What is the final concentration in weight per volume?

a student obtains a sample of a sand/salt mixture in a test tube. home weighs the test tube with the sample and finds the mass to be 20.70 grams. He pours half of the mixture into a beaker and weighs the test tube and finds the mass to be 15.50 grams. how much of the sand salt mixture is in the beaker?

A 11.630 gg milk chocolate bar is found to contain 7.815 gg of sugar.   What will be the amount of sugar in milligrams if the size of the milk chocolate bar is reduced from 11.630 gg  to 3.000 gg ?

In preparing a zinc oxide ointment, 28.35 g of zinc oxide was used rather than the correct quantity, 31.1 g. What percentage error was incurred?

The solubility of benzoic acid in water at room temperature is 0.45 g per 100 mL of water.  5.08 g of benzoic acid are dissolved in 100 mL of hot water (assume all of the benzoic acid dissolves). The sample cools to room tempurature and forms crystals. The crystals are separated by vacuum filtration. How many grams of benzoic acid crystals will be obtained?