Q: A student measures the mass of a liquid as 45.0 g and its volume as 15.0 mL. What is the density of the liquid, expressed with the correct number of significant figures?

$$d = \frac{45.0\ \text{g}}{15.0\ \text{mL}} = 3.0\ \text{g/mL}$$

Q: A sample of copper has a mass of 63.5 g and occupies a volume of 7.10 cm$$^3. $$What is its density?

$$d = \frac{63.5\ \text{g}}{7.10\ \text{cm}^3} = 8.94\ \text{g/cm}^3$$

Q: Which of the following is a real-life example of a covalent bond?

The bond between hydrogen and oxygen in water ($$\text{H}_2\text{O})$$

Q: Which of the following is a correct application of significant figures when multiplying 2.50 g by 0.00340 m?

$$2.50 \times 0.00340 = 0.00850$$

Question 1

Which of the following statements best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio.

Question 2

Which SI unit would you use to measure the amount of a substance in a chemical reaction?

Accepted Answer

Mole

Question 3

A student measures the mass of a liquid as 45.0 g and its volume as 15.0 mL. What is the density of the liquid, expressed with the correct number of significant figures?

Accepted Answer

$$d = \frac{45.0\ 	ext{g}}{15.0\ 	ext{mL}} = 3.0\ 	ext{g/mL}$$

Question 4

Which of the following best explains why ionic bonds form between metals and nonmetals?

Accepted Answer

Metals lose electrons to nonmetals, resulting in the formation of oppositely charged ions that attract each other.

Question 5

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 6

A chemist needs to measure the temperature of a reaction. Which SI unit should be used?

Accepted Answer

Kelvin

Question 7

Which of the following statements about atoms is correct?

Accepted Answer

Protons and neutrons are located in the nucleus, while electrons orbit around it.

Question 8

Which of the following is an example of a measurement with three significant figures?

Accepted Answer

4.50

Question 9

A sample of copper has a mass of 63.5 g and occupies a volume of 7.10 cm$$^3. $$What is its density?

Accepted Answer

$$d = \frac{63.5\ 	ext{g}}{7.10\ 	ext{cm}^3} = 8.94\ 	ext{g/cm}^3$$

Question 10

Which of the following best describes the difference between an element and a compound?

Accepted Answer

A compound consists of two or more elements chemically combined, while an element is a pure substance that cannot be broken down by chemical means.

Question 11

Which of the following is a real-life example of a covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in water ($$	ext{H}_2	ext{O})$$

Question 12

A student records the following measurements: 0.00340 m, 2.50 g, and 100.0 mL. How many significant figures are in each measurement, respectively?

Accepted Answer

3, 3, 4

Question 13

Which of the following best explains why the periodic table is organized by atomic number?

Accepted Answer

Atomic number represents the number of protons in an atom, which determines the element's identity.

Question 14

Which of the following is the correct formula for density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 15

A hospital stores oxygen gas in large tanks. Which state of matter is oxygen gas under normal conditions?

Accepted Answer

Gas

Question 16

Which of the following is a correct application of significant figures when multiplying 2.50 g by 0.00340 m?

Accepted Answer

$$2.50 	imes 0.00340 = 0.00850$$

Question 17

Which of the following best describes the process of measuring mass in the laboratory?

Accepted Answer

Using a balance to compare the mass of a sample to a known standard.

Question 18

Which of the following is a real-world example of an ionic bond?

Accepted Answer

The bond between sodium and chlorine in table salt ($$	ext{NaCl})$$

Question 19

A student mixes two clear liquids and observes the formation of a white solid. Which of the following best describes the white solid?

Accepted Answer

A compound formed by a chemical reaction

Matter, Measurement, and Atomic Structure: General Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard