Question 1

Which of the following best describes the difference between an element and a compound, as illustrated in the first image (panel c)?

Accepted Answer

An element contains only one type of atom, while a compound contains two or more types of atoms chemically bonded together.

Question 2

Which of the following is an example of a physical change, as shown in the second image?

Accepted Answer

Ice melting to form liquid water.

Question 3

In the third image, water is decomposed into hydrogen and oxygen gases using electricity. What type of change is this?

Accepted Answer

A chemical change.

Question 4

Which SI base unit would you use to measure the amount of substance, as shown in the fourth image?

Accepted Answer

Mole ($$\mathrm{mol})$$

Question 5

What is the value of 0.00056 meters in micrometers ($$\mum$$)?

Accepted Answer

$$5.6 	imes 10^2$ $$\mu$$m

Question 6

A student measures the mass of a gold bar as 19.32 g and its volume as 1.00 cm$$^3. $$What is the density of gold, and how many significant figures should the answer have?

Accepted Answer

$$19.3 g/cm$^3$$, 3 significant figures

Question 7

Which of the following best describes the difference between precision and accuracy, as illustrated by the dartboard images?

Accepted Answer

Precision refers to how close repeated measurements are to each other, while accuracy refers to how close measurements are to the true value.

Question 8

A graduated cylinder and a buret are used to measure 25 mL of water. The buret consistently shows a higher volume than the graduated cylinder. What does this indicate about the accuracy and precision of the two instruments?

Accepted Answer

The buret is more precise but less accurate than the graduated cylinder.

Question 9

Convert a temperature of $$68^\circF to $$degrees Celsius using the correct formula.

Accepted Answer

$$20^\circC$$

Question 10

Which of the following is an intensive property?

Accepted Answer

Density

Question 11

A sample of ethanol has a mass of 15.8 g and a volume of 20.0 mL. What is its density?

Accepted Answer

$$0.79 g/mL$$

Question 12

Which of the following numbers has three significant figures?

Accepted Answer

0.0105

Question 13

A student adds 212.2 mL, 26.7 mL, and 406.09 mL of water. What is the total volume, expressed with the correct number of significant figures?

Accepted Answer

$$645.0 mL$$

Question 14

Which of the following is the correct conversion factor to change kilometers to meters?

Accepted Answer

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

Question 15

If the density of table salt is $$2.16 g/cm$^3$$, what is the mass of $$10.0 cm$^3 of $$table salt?

Accepted Answer

$$21.6 g$$

Question 16

Which of the following best describes the relationship between temperature and molecular motion?

Accepted Answer

As temperature increases, the average speed of molecules increases.

Question 17

A cube has sides of length $$2.0 cm. $$What is its volume in mL?

Accepted Answer

$$8.0 mL$$

Question 18

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

Accepted Answer

Mass

Question 19

A student runs 100.00 m in 10.5 s. What is the average speed, expressed with the correct number of significant figures?

Accepted Answer

$$9.5 m/s$$

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

Guida di studio - Domande di pratica

Study guide - Flashcard