Q: Which of the following is a correct metric conversion for 1 kilometer?

$$1 \text{ km} = 1000 \text{ m}$$

Q: Convert 25 mL to liters using the correct conversion factor.

$$25 \text{ mL} \times \frac{1 \text{ L}}{1000 \text{ mL}} = 0.025 \text{ L}$$

Q: A doctor orders a patient to receive 0.050 g of a medicine currently suspended at a concentration of 10 mg/mL. How many mL of this medicine should you administer?

$$0.050 \text{ g} \times \frac{1000 \text{ mg}}{1 \text{ g}} \times \frac{1 \text{ mL}}{10 \text{ mg}} = 5.0 \text{ mL}$$

Q: A 24 pound child should take 160 mg of Tylenol for a fever. Each tablet contains 80 mg of Tylenol. If a child is 68 pounds and has a fever, how many Tylenol tablets should she take?

$$68 \text{ lb} \times \frac{160 \text{ mg}}{24 \text{ lb}} \times \frac{1 \text{ tablet}}{80 \text{ mg}} = 5.7 \text{ tablets}$$

Q: Which of the following is the correct temperature conversion from 25°C to Fahrenheit?

$$T_F = 1.8 \times 25 + 32 = 77$$^{\circ}$$F$$

Q: A beef patty weighs 0.50 lb and contains 9.0% fat by mass. How many grams of fat are in the patty? (1 lb = 454 g)

$$0.50 \text{ lb} \times \frac{454 \text{ g}}{1 \text{ lb}} \times 0.090 = 20.4 \text{ g}$$

Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout the sample.

Question 2

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

Accepted Answer

Iron rusting in the presence of oxygen.

Question 3

A sample of matter is composed of only one type of atom. Which classification best fits this sample?

Accepted Answer

Element

Question 4

Which of the following is a correct metric conversion for 1 kilometer?

Accepted Answer

$$1 	ext{ km} = 1000 	ext{ m}$$

Question 5

Which of the following statements about compounds is TRUE?

Accepted Answer

A compound is a pure substance made of two or more elements chemically joined in a fixed proportion.

Question 6

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

Question 7

Convert 25 mL to liters using the correct conversion factor.

Accepted Answer

$$25 	ext{ mL} 	imes \frac{1 	ext{ L}}{1000 	ext{ mL}} = 0.025 	ext{ L}$$

Question 8

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 9

A doctor orders a patient to receive 0.050 g of a medicine currently suspended at a concentration of 10 mg/mL. How many mL of this medicine should you administer?

Accepted Answer

$$0.050 	ext{ g} 	imes \frac{1000 	ext{ mg}}{1 	ext{ g}} 	imes \frac{1 	ext{ mL}}{10 	ext{ mg}} = 5.0 	ext{ mL}$$

Question 10

Which of the following is the correct scientific notation for 0.00000622?

Accepted Answer

$$6.22 	imes 10$$^{-6}$$

Question 11

Which of the following is a correct balanced chemical equation for the combustion of methane?

Accepted Answer

$$\mathrm{CH_4$} + 2\mathrm{O_2$} \rightarrow \mathrm{CO_2$} + 2\mathrm{H_2O}$$

Question 12

A 24 pound child should take 160 mg of Tylenol for a fever. Each tablet contains 80 mg of Tylenol. If a child is 68 pounds and has a fever, how many Tylenol tablets should she take?

Accepted Answer

$$68 	ext{ lb} 	imes \frac{160 	ext{ mg}}{24 	ext{ lb}} 	imes \frac{1 	ext{ tablet}}{80 	ext{ mg}} = 5.7 	ext{ tablets}$$

Question 13

Which of the following is a micronutrient required by the human body?

Accepted Answer

Zinc (Zn)

Question 14

Which of the following is the correct temperature conversion from 25°C to Fahrenheit?

Accepted Answer

$$T_F = 1.8 	imes 25 + 32 = 77$$^{\circ}$$F$$

Question 15

A beef patty weighs 0.50 lb and contains 9.0% fat by mass. How many grams of fat are in the patty? (1 lb = 454 g)

Accepted Answer

$$0.50 	ext{ lb} 	imes \frac{454 	ext{ g}}{1 	ext{ lb}} 	imes 0.090 = 20.4 	ext{ g}$$

Question 16

Which of the following is a correct statement about physical and chemical changes?

Accepted Answer

A physical change does not alter the chemical composition of a substance.

Question 17

How many centimeters are in 1 kilometer?

Accepted Answer

$$1 	ext{ km} 	imes \frac{1000 	ext{ m}}{1 	ext{ km}} 	imes \frac{100 	ext{ cm}}{1 	ext{ m}} = 100,000 	ext{ cm}$$

Chapter 1: Chemistry Basics – Matter, Measurement, and the Periodic Table

Guida di studio - Domande di pratica

Study guide - Flashcard