Q: Which of the following is the correct scientific notation for 0.0040 cm, showing the correct number of significant figures?

$$4.0 \times 10$$^{-3}$$\ \text{cm}$$

Q: Which of the following is the correct equality for converting meters to centimeters?

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

Q: Which of the following statements about density is correct?

Density is calculated as $$\text{density} = \frac{\text{mass}}{\text{volume}}.$$

Q: Which of the following is a correct conversion factor for the equality $$1\ \text{kg} = 2.20\ \text{lb}$$?

$$\frac{1\ \text{kg}}{2.20\ \text{lb}}$$

Q: A jewelry item contains 18% gold by mass. Which of the following is a correct conversion factor for this percentage?

$$\frac{18\ \text{g gold}}{100\ \text{g jewelry}}$$

Question 1

Which of the following best describes a hypothesis in the scientific method?

Accepted Answer

A testable idea to answer a question or explain an observation.

Question 2

Which of the following is a chemical property?

Accepted Answer

Paper can burn.

Question 3

Classify the following as a pure substance or a mixture: Air.

Accepted Answer

Mixture

Question 4

Which of the following best describes the particles in a liquid?

Accepted Answer

Particles are close together but moving randomly.

Question 5

Express 0.00000275 in scientific notation.

Accepted Answer

$$2.75 	imes 10$$^{-6}$$

Question 6

How many significant figures are in the measurement 0.0250 kg?

Accepted Answer

3

Question 7

When adding $$77.25 + 10.406$$, what is the correct answer with the proper number of significant figures?

Accepted Answer

$$87.66$$

Question 8

Perform the following calculation and give the answer with the correct number of significant figures: $$(5.00\ 	ext{cm} 	imes 4.408\ 	ext{cm}) \div 2.0\ 	ext{cm}$$

Accepted Answer

$$11$$

Question 9

Which of the following is the correct scientific notation for 0.0040 cm, showing the correct number of significant figures?

Accepted Answer

$$4.0 	imes 10$$^{-3}$$\ 	ext{cm}$$

Question 10

Which of the following SI prefixes decreases the size of the unit?

Accepted Answer

deci

Question 11

Which of the following is the correct equality for converting meters to centimeters?

Accepted Answer

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

Question 12

A patient weighs 164 lb. What is the mass in kilograms? (Use $$1\ 	ext{kg} = 2.20\ 	ext{lb})$$

Accepted Answer

$$74.5\ 	ext{kg}$$

Question 13

A rattlesnake is 2.44 m long. How many centimeters long is the snake?

Accepted Answer

$$244\ 	ext{cm}$$

Question 14

If your pace on a treadmill is 65 meters per minute, how many minutes will it take you to walk a distance of 7.5 kilometers?

Accepted Answer

$$115\ 	ext{min}$$

Question 15

A doctor's order prescribes a dosage of 0.150 mg of Synthroid. If tablets in stock contain 75 mcg of Synthroid, how many tablets are required to provide the prescribed medication?

Accepted Answer

2 tablets

Question 16

Which of the following statements about density is correct?

Accepted Answer

Density is calculated as $$	ext{density} = \frac{	ext{mass}}{	ext{volume}}.$$

Question 17

Which of the following is a correct conversion factor for the equality $$1\ 	ext{kg} = 2.20\ 	ext{lb}$$?

Accepted Answer

$$\frac{1\ 	ext{kg}}{2.20\ 	ext{lb}}$$

Question 18

A jewelry item contains 18% gold by mass. Which of the following is a correct conversion factor for this percentage?

Accepted Answer

$$\frac{18\ 	ext{g gold}}{100\ 	ext{g jewelry}}$$

Question 19

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

Accepted Answer

joule (J)

Question 20

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout.

Chapter 1: Chemistry, Matter, and Measurement – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard