Question 1

Which of the following is the correct SI unit for measuring mass?

Accepted Answer

kilogram (kg)

Question 2

A nurse needs to administer 0.250 g of a medication, but the tablets available are labeled as 50 mg each. How many tablets should the nurse give?

Accepted Answer

5 tablets

Question 3

Which of the following numbers contains three significant figures?

Accepted Answer

0.00476

Question 4

A sample of metal has a mass of 36.0 g and a volume of 8.0 mL. What is its density?

Accepted Answer

$$4.5\ \mathrm{g/mL}$$

Question 5

Which of the following is an exact number?

Accepted Answer

1 kg = 1000 g

Question 6

Convert 2.44 meters to centimeters.

Accepted Answer

$$244\ \mathrm{cm}$$

Question 7

A patient’s urine sample has a density of $$1.015\ \mathrm{g/mL}. $$What is the specific gravity of the sample?

Accepted Answer

$$1.015$$

Question 8

Which of the following numbers has four significant figures?

Accepted Answer

0.004560

Question 9

A doctor prescribes 0.150 mg of Synthroid. If the pharmacy only has 50.0 mcg tablets, how many tablets are needed?

Accepted Answer

3.0 tablets

Question 10

Which of the following is the correct equality for volume?

Accepted Answer

$$1\ \mathrm{L} = 1000\ \mathrm{mL}$$

Question 11

A student adds $$82.409\ \mathrm{mg}$$ and $$22.0\ \mathrm{mg}. $$What is the answer with the correct number of significant figures?

Accepted Answer

$$104.4\ \mathrm{mg}$$

Question 12

Which of the following conversion factors is derived from a defined equality and thus has unlimited significant figures?

Accepted Answer

$$1\ \mathrm{m} = 100\ \mathrm{cm}$$

Question 13

A sample of cough syrup has a density of $$1.20\ \mathrm{g/mL}. If a $$patient takes $$2.0$$ teaspoons ($$1\ \mathrm{tsp} = 5.0\ \mathrm{mL}$$), what is the mass of syrup consumed?

Accepted Answer

$$12\ \mathrm{g}$$

Question 14

Which of the following is the correct scientific notation for the number 0.002650?

Accepted Answer

$$2.650 	imes 10$$^{-3}$$

Question 15

A person weighs 178 lb. What is their mass in kilograms? (Use $$1\ \mathrm{kg} = 2.20\ \mathrm{lb})$$

Accepted Answer

$$80.9\ \mathrm{kg}$$

Question 16

Which of the following is NOT a rule for determining significant figures?

Accepted Answer

Leading zeros are significant.

Question 17

A solution has a density of $$1.32\ \mathrm{g/mL}. $$What is the volume of $$14.7\ \mathrm{g} of $$this solution?

Accepted Answer

$$11.1\ \mathrm{mL}$$

Question 18

Which of the following is the correct metric prefix for $$10^{-6}$$?

Accepted Answer

micro

Question 19

If your pace on a treadmill is $$65\ \mathrm{m/min}$$, how many minutes will it take to walk $$7.5\ \mathrm{km}$$?

Accepted Answer

$$120\ \mathrm{min}$$

Chemistry and Measurements: Units, Significant Figures, and Conversion Factors

Guida di studio - Domande di pratica

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