Q: A laboratory technician needs to convert 2.50 kilometers to centimeters. Which of the following is the correct calculation?

$$2.50 \times 10^5$ \text{ cm}$$

Q: Convert 0.00378 meters to micrometers ($$\mum).$$

$$3.78 \times 10^6$ \ \mu\text{m}$$

Q: A hospital has 125 deciliters (dL) of blood plasma. What is the volume in milliliters (mL)?

$$1.25 \times 10^3$ \text{ mL}$$

Q: A scientist needs to convert 3.5 Gbytes to kbytes. What is the correct answer using metric prefixes?

$$3.5 \times 10^6$ \text{ kbytes}$$

Q: Which of the following is the correct equivalence statement for volume?

$$1 \text{ mL} = 1 \text{ cm}^3$$

Q: A student needs to convert 8.00 meters to inches. Which sequence of conversion factors should be used?

$$8.00 \text{ m} \times \frac{1 \text{ in}}{2.54 \text{ cm}} \times \frac{1 \text{ cm}}{1 \times 10$$^{-2}$$ \text{ m}}$$

Question 1

Which of the following is the correct SI base unit for measuring the amount of substance?

Accepted Answer

Mole (mol)

Question 2

A laboratory technician needs to convert 2.50 kilometers to centimeters. Which of the following is the correct calculation?

Accepted Answer

$$2.50 	imes 10^5$ 	ext{ cm}$$

Question 3

A sample of gold has a mass of 155 g and a volume of 8.02 cm$$^3. $$What is the density of gold in g/cm$$^3$$?

Accepted Answer

$$19.3 	ext{ g/cm}^3$$

Question 4

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

Accepted Answer

Accuracy is how close measurements are to the true value; precision is how close measurements are to each other.

Question 5

A student measures the mass of a sample four times and records: 2.52 g, 2.48 g, 2.42 g, and 2.55 g. The actual mass is 2.50 g. Which statement is correct?

Accepted Answer

The measurements are both accurate and precise.

Question 6

Convert 0.00378 meters to micrometers ($$\mum).$$

Accepted Answer

$$3.78 	imes 10^6$ \ \mu	ext{m}$$

Question 7

A hospital has 125 deciliters (dL) of blood plasma. What is the volume in milliliters (mL)?

Accepted Answer

$$1.25 	imes 10^3$ 	ext{ mL}$$

Question 8

Which instrument would you use to deliver a specific, fixed volume of liquid most accurately?

Accepted Answer

Volumetric flask

Question 9

A scientist needs to convert 3.5 Gbytes to kbytes. What is the correct answer using metric prefixes?

Accepted Answer

$$3.5 	imes 10^6$ 	ext{ kbytes}$$

Question 10

Which of the following numbers has four significant figures?

Accepted Answer

3.005

Question 11

A cube of gold has a length of 2.00 cm on each side. If the density of gold is $$19.32 	ext{ g/cm}^3$$, what is the mass of the cube?

Accepted Answer

$$155 	ext{ g}$$

Question 12

Which of the following is an exact number?

Accepted Answer

The number of eggs in a dozen

Question 13

A scientist records a temperature of 25.0 $$^\circC. $$What is this temperature in Kelvin?

Accepted Answer

$$298.15 	ext{ K}$$

Question 14

Which of the following is the correct equivalence statement for volume?

Accepted Answer

$$1 	ext{ mL} = 1 	ext{ cm}^3$$

Question 15

A student needs to convert 8.00 meters to inches. Which sequence of conversion factors should be used?

Accepted Answer

$$8.00 	ext{ m} 	imes \frac{1 	ext{ in}}{2.54 	ext{ cm}} 	imes \frac{1 	ext{ cm}}{1 	imes 10$$^{-2}$$ 	ext{ m}}$$

Question 16

A measurement is recorded as 2.49 mL. What is the uncertainty in this measurement if the last digit is uncertain?

Accepted Answer

$$\pm 0.01 	ext{ mL}$$

Question 17

Which of the following best describes the result of multiplying $$7.3 	ext{ cm} 	imes 0.002 	ext{ cm}$$, using the correct number of significant figures?

Accepted Answer

$$0.01 	ext{ cm}^2$$

Question 18

A woman has a mass of 115 lb. What is her mass in kilograms? (Use $$1 	ext{ kg} = 2.2 	ext{ lb})$$

Accepted Answer

$$52.3 	ext{ kg}$$

Question 19

Which of the following is the correct scientific notation for 0.0000859?

Accepted Answer

$$8.59 	imes 10$$^{-5}$$

Chapter 1: Introduction to Matter, Energy, and Measurement

Guida di studio - Domande di pratica

Study guide - Flashcard