Chem Quiz 1 (HW 1,2)

Carrots are $0.79 per pound. What is the cost of 1.2 kg of carrots?

$2.10

Which of the following measurements are NOT equivalent? 25 mg = 0.025 g 183 L = 0.183 kL 150 msec = 0.150 sec 84 cm = 8.4 mm 24 dL = 2.4 L

84 cm = 8.4 mm

Give your answer in correct number of significant figures: (4.0 x 102 ) (0.04) / 7.2

2

A doctor's order is 0.125 g of ampicillin. The liquid suspension on hand contains 250 mg/5.0 mL. How many milliliters of the suspension are required?

2.5 mL

The amount of space occupied by a substance is its

volume

The measurement of the gravitational pull on an object is its

weight

What is the correct answer for the calculation of a volume (in mL) with measured numbers 28.58/(16 x 8.02)?

0.22 mL

Which of the following measurements has three significant figures? 0.005 m 510 m 0.510 m 0.051 m 5100 m

0.510 m

What is the metric relationship between grams and micrograms?

1 g = 1 000 000 μg

A 50.0 mL urine sample has a mass of 50.7 g. The specific gravity of the urine is

1.01

The density of a solution is 1.18 g/mL. Its specific gravity is

1.18

What is the answer, with the correct number of significant figures, for this problem? 4.392g + 102.40g + 2.51g =

109.30 g

How many centimeters are there in 57.0 in.?

145 cm

A dose of aspirin of 5.0 mg per kilogram of body weight has been prescribed to reduce the fever of an infant weighing 8.5 pounds. The number of milligrams of aspirin that should be administered is

19 mg

A nugget of gold with a mass of 521 g is added to 50.0 mL of water. The water level rises to a volume of 77.0 mL. What is the density of the gold?

19.3 g/mL

Which of the following examples illustrates a number that is correctly rounded to three significant figures? 4.05438 grams to 4.054 grams 0.03954 grams to 0.040 grams 103.692 grams to 103.7 grams 109,526 grams to 109 500 grams 20.0332 grams to 20.0 grams

20.0332 grams to 20.0 grams

Which of the following conversion factors is a measured number? 10 cm/dm 12 in/ft 16 oz/lb 25 miles/gallon 12 eggs/dozen

25 miles/gallon

Identify the correct number of significant figures in an object with a mass of 0.06020 g.

4

Which of the following numbers is the smallest? 4.0 x 10-6 4.0 x 10-8 4.0 x 10-2 4.0 x 1015 4.0 x 10-12

4.0 x 10-12

Diamond has a density of 3.52 g/mL. What is the volume in cubic centimeters of a diamond with a mass of 15.1 g?

4.29 cm^3

The measurement 0.000 0043 m, expressed correctly using scientific notation, is

4.3 x 10-6 m.

How many liters of soft drink are there in 5.25 qt?

4.95 L

The number of significant figures in the measurement of 45.030 mm is

5

The number 680 000 000 expressed correctly using scientific notation is

6.8 x 108.

Which one of the following substances will float in gasoline, which has a density of 0.66 g/mL? table salt (density = 2.16 g/mL) balsa wood (density = 0.16 g/mL) sugar (density = 1.59 g/mL) alluminium (density = 2.70 g/mL) mercury (density = 13.6 g/mL)

balsa wood (density = 0.16 g/mL)

Which of the following is often used to determine an individual's percentage of body fat? temperature height weight loss weight gain density

density

Which of the following is the smallest unit? gram milligram kilogram decigram microgram

microgram

The cubic centimeter (cm3 or cc) has the same volume as a

milliliter

In which of the following is the metric unit paired with its correct abbreviation? microgram / mg milliliter / mL centimeter / km kilogram / cg gram / gm

milliliter / mL

Significant figures are important because they indicate

the precision of a measurement