Q: Convert $$325\ \mathrm{mg}$$, $$303.15\ \mathrm{mg}$$, and $$418.1662\ \mathrm{mg} of $$aspirin to grams, add them, and report the answer with the correct number of significant figures in scientific notation.

$$1.05 \times 10$$^{0}$$\ \mathrm{g}$$

Question 1

Which of the following best describes the difference between a physical change and a chemical change?

Accepted Answer

A chemical change results in a new substance with a different chemical identity, while a physical change does not alter the substance's identity.

Question 2

Which of the following is a pure substance?

Accepted Answer

Oxygen gas ($$\mathrm{O_2$})$$

Question 3

A compound contains 6 carbon atoms, 8 hydrogen atoms, and 7 oxygen atoms. What is its chemical formula?

Accepted Answer

$$\mathrm{C_6H_8O_7}$$

Question 4

Which of the following is the correct balanced chemical equation for the reaction between hydrochloric acid and zinc?

Accepted Answer

$$\mathrm{HCl(aq) + Zn(s) \rightarrow $$ZnCl_2$$(aq) + H_2$(g)}$$

Question 5

A patient is prescribed a medication at a dose of $$5\ \mathrm{mg/kg}$$ per day, divided into two doses. If the patient weighs $$44\ \mathrm{lb}$$, how many milligrams should be given per dose? (1 kg = 2.2 lb)

Accepted Answer

$$100\ \mathrm{mg}$$

Question 6

Convert $$325\ \mathrm{mg}$$, $$303.15\ \mathrm{mg}$$, and $$418.1662\ \mathrm{mg} of $$aspirin to grams, add them, and report the answer with the correct number of significant figures in scientific notation.

Accepted Answer

$$1.05 	imes 10$$^{0}$$\ \mathrm{g}$$

Question 7

Which of the following is the correct SI unit for energy?

Accepted Answer

Joule

Question 8

A patient receives $$2.0\ \mathrm{L} of $$fluid over $$18\ \mathrm{h}$$ through an IV. The drop factor is $$20\ \mathrm{gtt/mL}. $$What is the drip rate in drops per minute ($$\mathrm{gtt/min}$$)?

Accepted Answer

$$37\ \mathrm{gtt/min}$$

Question 9

Which of the following statements about density is correct?

Accepted Answer

Density is constant for a substance at a given temperature and can be used as a conversion factor between mass and volume.

Question 10

A 19-lb child should receive only $$17\% of $$the adult dose of sodium thiopental, which is $$280\ \mathrm{mg}. $$What is the correct dose for the child?

Accepted Answer

$$47.6\ \mathrm{mg}$$

Question 11

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy refers to how close measurements are to the true value, while precision refers to how close measurements are to each other.

Question 12

Which of the following is the correct conversion factor for converting calories to joules?

Accepted Answer

$$1\ \mathrm{calorie} = 4.184\ \mathrm{joules}$$

Question 13

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen

Question 14

Which of the following is the correct scientific notation for $$0.00056$$?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 15

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

Accepted Answer

Liter – volume

Question 16

Which of the following best describes kinetic energy?

Accepted Answer

Energy due to motion

Question 17

Which of the following is a correct statement of the Law of Conservation of Energy?

Accepted Answer

Energy can be converted from one form to another, but cannot be created or destroyed.

Question 18

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

Accepted Answer

Milli-

Question 19

Which of the following best describes a mixture?

Accepted Answer

A combination of two or more substances that can be separated by physical means

Question 20

Which of the following is the correct formula for density?

Accepted Answer

$$d = \dfrac{m}{V}$$

Chapter 1: Chemistry Basics – Matter and Measurement

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