Q: A nurse needs to administer Fortaz at a dosage of 50 mg/kg to a child who weighs 56 lbs. The medication is available as 100 mg/mL. How many mL should the nurse administer per dose? (1 kg = 2.2046 lbs)

$$\displaystyle 12.75\ \text{mL}$$

Q: Convert $$8.160\ \text{m} to$$ $$\mu\text{m} ($$micrometers).

$$\displaystyle 8.16 \times 10^6$\ \mu\text{m}$$

Q: Which of the following is the correct exponential notation for 0.000123?

$$\displaystyle 1.23 \times 10$$^{-4}$$

Q: A student measures the mass of a metal bar as $$60.658 g $$and its volume as $$5.00 mL. $$What is the density of the metal?

$$\displaystyle 12.13\ \text{g/mL}$$

Q: Which of the following is a correct conversion for $$3779\ \text{pg} to $$grams?

$$\displaystyle 3.779 \times 10$$^{-9}$$\ \text{g}$$

Q: A sample of dry air at $$25^\circ\text{C}$$ has a density of $$1.2\ \text{g/L}. $$What is the mass of air in a $$2.5\ \text{L}$$ container?

$$\displaystyle 3.0\ \text{g}$$

Question 1

Which of the following best describes the scientific method as used in chemistry?

Accepted Answer

A process involving observation, hypothesis formation, experimentation, and analysis to develop theories and laws.

Question 2

A nurse needs to administer Fortaz at a dosage of 50 mg/kg to a child who weighs 56 lbs. The medication is available as 100 mg/mL. How many mL should the nurse administer per dose? (1 kg = 2.2046 lbs)

Accepted Answer

$$\displaystyle 12.75\ 	ext{mL}$$

Question 3

Which of the following is an example of a chemical change?

Accepted Answer

Burning of wood

Question 4

Which of the following statements about elements, compounds, and mixtures is correct?

Accepted Answer

An element is a pure substance that cannot be broken down by chemical means.

Question 5

Convert $$8.160\ 	ext{m} to$$ $$\mu	ext{m} ($$micrometers).

Accepted Answer

$$\displaystyle 8.16 	imes 10^6$\ \mu	ext{m}$$

Question 6

Which of the following is an intensive property?

Accepted Answer

Density

Question 7

A gas bulb contains 500 grams of methane ($$	ext{CH}_4) in a 200-mL $$container. If the temperature is increased from $$25^\circ	ext{C} to$$ $$150^\circ	ext{C}$$, which equation would you use to calculate the final pressure, assuming ideal gas behavior?

Accepted Answer

$$\displaystyle PV = nRT$$

Question 8

Which of the following is the correct exponential notation for 0.000123?

Accepted Answer

$$\displaystyle 1.23 	imes 10$$^{-4}$$

Question 9

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with uniform composition throughout

Question 10

A student measures the mass of a metal bar as $$60.658 g $$and its volume as $$5.00 mL. $$What is the density of the metal?

Accepted Answer

$$\displaystyle 12.13\ 	ext{g/mL}$$

Question 11

Which of the following is a correct conversion for $$3779\ 	ext{pg} to $$grams?

Accepted Answer

$$\displaystyle 3.779 	imes 10$$^{-9}$$\ 	ext{g}$$

Question 12

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 13

A sample of dry air at $$25^\circ	ext{C}$$ has a density of $$1.2\ 	ext{g/L}. $$What is the mass of air in a $$2.5\ 	ext{L}$$ container?

Accepted Answer

$$\displaystyle 3.0\ 	ext{g}$$

Question 14

Which of the following is the correct relationship between Celsius and Kelvin temperature scales?

Accepted Answer

$$\displaystyle K = ^\circ C + 273.15$$

Question 15

A student needs to convert $$20.13\ 	ext{mL} to $$liters. What is the correct answer?

Accepted Answer

$$\displaystyle 2.013 	imes 10$$^{-2}$$\ 	ext{L}$$

Question 16

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 17

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in fixed proportions

Question 18

A student records the following measurements for the mass of a sample: $$2.34\ 	ext{g}$$, $$2.35\ 	ext{g}$$, $$2.33\ 	ext{g}. $$The true value is $$2.80\ 	ext{g}. $$Which statement best describes the data?

Accepted Answer

Precise but not accurate

Question 19

Which of the following is the correct exponential notation for $$547900000$$?

Accepted Answer

$$\displaystyle 5.479 	imes 10$$^{8}$$

Question 20

Which of the following is a correct conversion for $$1738\ 	ext{km} to $$meters?

Accepted Answer

$$\displaystyle 1.738 	imes 10$$^{6}$$\ 	ext{m}$$

Essential Concepts in General Chemistry: Matter, Measurement, and Scientific Method

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