?Consider the following solids. The solids A, B, and C represent aluminum, gold, and

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On Greg’s last visit to his doctor, he complained of feeling tired. His doctor orders a blood test for iron. Sandra, the registered nurse, does a venipuncture and withdraws 8.0 mL of blood. About 70% of the iron in the body is used to form hemoglobin, which is a protein in the red blood cells that carries oxygen to the cells of the body. About 30% is stored in ferritin, bone marrow, and the liver. When the iron level is low, a person may have fatigue and decreased immunity. The normal range for serum iron in men is 80 to 160 mcg/dL. Greg’s iron test showed a blood serum iron level of 42 mcg/dL, which indicates that Greg has iron deficiency anemia. His doctor orders an iron supplement to be taken twice daily (b.i.d.). One tablet of the iron supplement contains 65 mg of iron. a. Write an equality and two conversion factors for one tablet of the iron supplement. b. How many grams of iron will Greg consume in one week?

In which of the following pairs do both numbers contain the same number of significant figures? (2.2) a. 2.0500 m and 0.0205 m b. 600.0 K and 60 K c. 0.000 75 s and 75 000 s d. 6.240 L and 6.240 × 10?² L

In which of the following pairs do both numbers contain the same number of significant figures? (2.2) a. 3.44 × 10?³ g and 0.0344 g b. 0.0098 s and 9.8 × 10? s c. 6.8 * 10³3 m and 68 000 m d. 258.000 g and 2.58 × 10?² g

Indicate if each of the following is answered with an exact number or a measured number: (2.2) a. number of legs b. height of table c. number of chairs at the table d. area of tabletop

Measure the length of each of the objects in diagrams (a), (b), and (c) using the metric ruler in the figure. Indicate the number of significant figures for each and the estimated digit for each. (2.2)

The length of this rug is 38.4 in. and the width is 24.2 in. (2.3) a. What is the length of this rug measured in centimeters? b. What is the width of this rug measured in centimeters? c. How many significant figures are in the length measurement? d. Calculate the area of the rug, in cm2, to the correct number of significant figures.

Each of the following diagrams represents a container of water and a cube. Some cubes float while others sink. Match diagrams 1, 2, 3, or 4 with one of the following descriptions and explain your choices: (2.7) a. The cube has a greater density than water. b. The cube has a density that is 0.80 g/>mL. c. The cube has a density that is one-half the density of water. d. The cube has the same density as water.

What is the density of the solid object that is weighed and submerged in water? (2.7)

Consider the following solids. The solids A, B, and C represent aluminum, gold, and silver. If each has a mass of 10.0 g, what is the identity of each solid? (2.7) Density of aluminum = 2.70 g/mL Density of gold = 19.3 g/mL Density of silver = 10.5 g/mL

A graduated cylinder contains three liquids A, B, and C, which have different densities and do not mix: mercury (D = 13.6 g/mL), vegetable oil (D = 0.92 g/mL), and water (D = 1.00 g/mL). Identify the liquids A, B, and C in the cylinder. (2.7)

Round off or add zeros to the following calculated answers to give a final answer with three significant figures: (2.2) a. 0.000 012 58 L b. 3.528 × 10² kg c. 125 111 m

Round off or add zeros to the following calculated answers to give a final answer with three significant figures: (2.2) a. 58.703 g b. 3 × 10?³ s c. 0.010 826 g

How many cubic centimeters (cm³) of olive oil have the same mass as 1.50 L of gasoline (see Table 2.9)? (2.7)

In the manufacturing of computer chips, cylinders of silicon are cut into thin wafers that are 3.00 in. in diameter and have a mass of 1.50 g of silicon. How thick, in millimeters, is each wafer if silicon has a density of 2.33 g/cm³? (The volume of a cylinder is .) (2.6)

For a 180-lb person, calculate the quantity of each of the following that must be ingested to provide the LD?? for caffeine given in Table 2.8: (2.6) a. cups of coffee if one cup is 12 fl oz and there is 100. mg of caffeine per 6 fl oz of drip-brewed coffee b. cans of cola if one can contains 50. mg of caffeine c. tablets of No-Doz if one tablet contains 100. mg of caffeine

A mouthwash is 21.6% ethanol by mass. If each bottle contains 0.358 pt of mouthwash with a density of 0.876 g/mL, how many kilograms of ethanol are in 180 bottles of the mouthwash? (2.6, 2.7)

Suppose you have two 100-mL graduated cylinders. In each cylinder, there is 40.0 mL of water. You also have two cubes: One is lead, and the other is aluminum. Each cube measures 2.0 cm on each side. After you carefully lower each cube into the water of its own cylinder, what will the new water level be in each of the cylinders? (2.7)

A dessert contains 137.25 g of vanilla ice cream, 84 g of fudge sauce, and 43.7 g of nuts. (2.3, 2.6) a. What is the total mass, in grams, of the dessert? b. What is the total weight, in pounds, of the dessert?

A fish company delivers 22 kg of salmon, 5.5 kg of crab, and 3.48 kg of oysters to your seafood restaurant. (2.3, 2.6) a. What is the total mass, in kilograms, of the seafood? b. What is the total number of pounds?

In France, grapes are 1.75 Euros per kilogram. What is the cost of grapes, in dollars per pound, if the exchange rate is 1.36 dollars/Euro? (2.6)

In Mexico, avocados are 48 pesos per kilogram. What is the cost, in cents, of an avocado that weighs 0.45 lb if the exchange rate is 13 pesos to the dollar? (2.6)

Bill’s recipe for onion soup calls for 4.0 lb of thinly sliced onions. If an onion has an average mass of 115 g, how many onions does Bill need? (2.6)

The price of 1 lb of potatoes is $1.75. If all the potatoes sold today at the store bring in $1420, how many kilograms of potatoes did grocery shoppers buy? (2.6)

The density of lead is 11.3 g/mL. The water level in a graduated cylinder initially at 215 mL rises to 285 mL after a piece of lead is submerged. What is the mass, in grams, of the lead? (2.7)

The density of lead is 11.3 g/mL. The water level in a graduated cylinder initially at 215 mL rises to 285 mL after a piece of lead is submerged. What is the mass, in grams, of the lead? (2.7)

Ethanol has a density of 0.79 g/mL. What is the volume, in quarts, of 1.50 kg of alcohol? (2.7)

The following nutrition information is listed on a box of crackers: (2.6) Serving size 0.50 oz (6 crackers) Fat 4 g per serving; Sodium 140 mg per serving a. If the box has a net weight (contents only) of 8.0 oz, about how many crackers are in the box? b. If you ate 10 crackers, how many ounces of fat are you consuming? c. How many servings of crackers in part a would it take to obtain the Daily Value (DV) for sodium, which is 2300 mg?

A dialysis unit requires 75 000 mL of distilled water. How many gallons of water are needed? (1 gal = 4 qt) (2.6)

To prevent bacterial infection, a doctor orders 4 tablets of amoxicillin per day for 10 days. If each tablet contains 250 mg of amoxicillin, how many ounces of the medication are given in 10 days? (2.6)

Celeste’s diet restricts her intake of protein to 24 g per day. If she eats 1.2 oz of protein, has she exceeded her protein limit for the day? (2.6)

A doctor orders 5.0 mL of phenobarbital elixir. If the phenobarbital elixir is available as 30. mg per 7.5 mL, how many milligrams is given to the patient? (2.6)

A doctor orders 2.0 mg of morphine. The vial of morphine on hand is 10. mg per 1.0 mL. How many milliliters of morphine should you administer to the patient? (2.6)

A balance measures mass to 0.001 g. If you determine the mass of an object that weighs about 30 g, would you record the mass as 30 g, 31 g, 31.2 g, 31.16 g, or 31.075 g? Explain your choice by writing two to three complete sentences that describe your thinking. (2.3)

When three students use the same meterstick to measure the length of a paper clip, they obtain results of 5.8 cm, 5.75 cm, and 5.76 cm. If the meterstick has millimeter markings, what are some reasons for the different values? (2.3)

A car travels at 55 mi/h and gets 11 km/L of gasoline. How many gallons of gasoline are needed for a 3.0-h trip? (2.6)

A 50.0-g silver object and a 50.0-g gold object are both added to 75.5 mL of water contained in a graduated cylinder. What is the new water level, in milliliters, in the cylinder? (2.7)

A sunscreen preparation contains 2.50% benzyl salicylate by mass. If a tube contains 4.0 oz of sunscreen, how many kilograms of benzyl salicylate are needed to manufacture 325 tubes of sunscreen? (2.6)

A dietary supplement contains the following components. If a person uses the dietary supplement once a day, how many milligrams of each component would that person consume in one week? (2.6) a. calcium 0.20 g b. iron 0.50 mg c. iodine 53 mcg d. chromium 45 mcg e. threonine 0.285 g

a. Some athletes have as little as 3.0% body fat. If such a person has a body mass of 65 kg, how many pounds of body fat does that person have? (2.6) b. In liposuction, a doctor removes fat deposits from a person’s body. If body fat has a density of 0.94 g/mL and 3.0 L of fat is removed, how many pounds of fat were removed from the patient?