Q: A student measures the mass of a liquid as 25.0 g and its volume as 10.0 mL. What is the density of the liquid?

$$d = \frac{25.0\ \text{g}}{10.0\ \text{mL}} = 2.5\ \text{g/mL}$$

Q: A sample of copper has a mass of 89.6 g and occupies a volume of 10.0 cm$$^3. $$What is its density?

$$d = \frac{89.6\ \text{g}}{10.0\ \text{cm}^3} = 8.96\ \text{g/cm}^3$$

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

Carbon dioxide ($$\text{CO}_2)$$

Q: A sample of ethanol has a mass of 46.0 g and a volume of 58.0 mL. What is its density?

$$d = \frac{46.0\ \text{g}}{58.0\ \text{mL}} = 0.793\ \text{g/mL}$$

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 substance in a chemical reaction?

Accepted Answer

Mole

Question 3

A student measures the mass of a liquid as 25.0 g and its volume as 10.0 mL. What is the density of the liquid?

Accepted Answer

$$d = \frac{25.0\ 	ext{g}}{10.0\ 	ext{mL}} = 2.5\ 	ext{g/mL}$$

Question 4

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 5

What is the main difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electron pairs.

Question 6

Which particle determines the atomic number of an element?

Accepted Answer

Proton

Question 7

A sample of copper has a mass of 89.6 g and occupies a volume of 10.0 cm$$^3. $$What is its density?

Accepted Answer

$$d = \frac{89.6\ 	ext{g}}{10.0\ 	ext{cm}^3} = 8.96\ 	ext{g/cm}^3$$

Question 8

Which of the following best describes an element?

Accepted Answer

A substance that cannot be broken down by chemical means.

Question 9

Which of the following is a correct statement about significant figures?

Accepted Answer

They express the precision of a measurement.

Question 10

A chemist mixes sodium ($$	ext{Na}) $$and chlorine ($$	ext{Cl}_2) to $$form sodium chloride ($$	ext{NaCl}). $$What type of bond is formed?

Accepted Answer

Ionic bond

Question 11

Which of the following is NOT an SI unit?

Accepted Answer

Liter

Question 12

If a measurement is recorded as 0.00450 kg, how many significant figures does it have?

Accepted Answer

3

Question 13

Which of the following best describes the location of electrons in an atom?

Accepted Answer

Electrons orbit the nucleus.

Question 14

A student needs to measure the temperature of a chemical reaction. Which SI unit should they use?

Accepted Answer

Kelvin

Question 15

Which of the following is a real-life example of a compound?

Accepted Answer

Carbon dioxide ($$	ext{CO}_2)$$

Question 16

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements are organized by atomic number.

Question 17

A sample of ethanol has a mass of 46.0 g and a volume of 58.0 mL. What is its density?

Accepted Answer

$$d = \frac{46.0\ 	ext{g}}{58.0\ 	ext{mL}} = 0.793\ 	ext{g/mL}$$

Question 18

Which of the following is a characteristic of a solid state of matter?

Accepted Answer

Definite shape and definite volume

Question 19

Which of the following best explains why water ($$	ext{H}_2	ext{O}) is $$considered a compound?

Accepted Answer

It is composed of two elements chemically combined in a fixed ratio.

Question 20

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

Accepted Answer

Gas

Matter, Measurements, and Atomic Structure: General Chemistry Study Guide

Guida di studio - Domande di pratica

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