Q: Which of the following is the correct relationship between mass, volume, and density?

$$\text{Density} = \dfrac{\text{mass}}{\text{volume}}$$

Question 1

Which of the following best describes the Law of Conservation of Mass as it applies to a chemical reaction?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 2

A doctor prescribes an antibiotic at a dosage of $$4\ \mathrm{mg/kg}$$ for a patient who weighs $$153\ \mathrm{lb}. $$How many milligrams of the antibiotic should be administered? (1 kg = 2.2 lb)

Accepted Answer

$$278\ \mathrm{mg}$$

Question 3

Which of the following is the correct number of significant figures in the measurement $$0.00420$$?

Accepted Answer

3 significant figures

Question 4

A steel bar has a mass of $$38\ \mathrm{g}$$ and a density of $$7.86\ \mathrm{g/mL}. $$What is its volume?

Accepted Answer

$$4.83\ \mathrm{mL}$$

Question 5

Which of the following is NOT a correct SI base unit and its quantity?

Accepted Answer

liter – length

Question 6

A patient weighs $$111\ \mathrm{lb}. $$What is the patient's mass in kilograms? (1 kg = 2.2 lb)

Accepted Answer

$$50.5\ \mathrm{kg}$$

Question 7

Which of the following best describes a chemical property?

Accepted Answer

The ability of a substance to react with oxygen

Question 8

A cube measures $$2\ \mathrm{cm} 	imes 3\ \mathrm{cm} 	imes 4\ \mathrm{cm}. $$What is its volume in $$\mathrm{mL}$$?

Accepted Answer

$$24\ \mathrm{mL}$$

Question 9

Which of the following is the correct scientific notation for $$0.00025$$?

Accepted Answer

$$2.5 	imes 10$$^{-4}$$

Question 10

A doctor prescribes $$100\ \mathrm{mg} of a $$medication to a $$160\ \mathrm{lb}$$ patient. The medication is prescribed at a dosage of $$5\ \mathrm{mg/kg}. $$How much medication should the patient be given?

Accepted Answer

$$364\ \mathrm{mg}$$

Question 11

Which of the following is a correct conversion factor for converting inches to centimeters?

Accepted Answer

$$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$

Question 12

A student needs $$150\ \mathrm{g} of $$ethanol for an experiment. The density of ethanol is $$0.789\ \mathrm{g/mL}. $$How many $$\mathrm{mL} of $$ethanol are needed?

Accepted Answer

$$190\ \mathrm{mL}$$

Question 13

Which of the following statements about significant figures is TRUE?

Accepted Answer

Trailing zeros after a decimal point are significant.

Question 14

A patient with Parkinson’s Disease is prescribed $$91\ \mathrm{mg} of $$Dopamine to be administered intravenously at a rate of $$0.6\ \mathrm{mg/min}. $$How many hours are required for the drug to be fully administered?

Accepted Answer

$$2.5\ \mathrm{hours}$$

Question 15

Which of the following is the correct relationship between mass, volume, and density?

Accepted Answer

$$	ext{Density} = \dfrac{	ext{mass}}{	ext{volume}}$$

Question 16

A paper measures $$8.5$$ inches in width. How many centimeters is this? ($$1\ \mathrm{in} = 2.54\ \mathrm{cm})$$

Accepted Answer

$$21.6\ \mathrm{cm}$$

Question 17

Which of the following is an example of a physical property?

Accepted Answer

The boiling point of water

Question 18

A doctor prescribes $$100\ \mathrm{mg} of a $$medication to a $$225\ \mathrm{lb}$$ patient. The medication is prescribed at a dosage of $$4\ \mathrm{mg/kg}. $$How much medication should the patient be given? ($$1\ \mathrm{kg} = 2.2\ \mathrm{lb})$$

Accepted Answer

$$409\ \mathrm{mg}$$

Question 19

Which of the following is the correct metric prefix for $$10^{-3}$$?

Accepted Answer

milli-

Fundamentals of Chemistry: Matter, Measurement, and Calculations

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