Question 1

A student measures the mass of a metal sample as 12.30 g and its volume as 4.1 mL. What is the density of the metal, reported with the correct number of significant figures?

Accepted Answer

$$3.0\ \mathrm{g/mL}$$

Question 2

Which of the following best describes the difference between a physical and a chemical change? Choose the scenario that is a chemical change.

Accepted Answer

Iron rusting in moist air

Question 3

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 4

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of carbon dioxide. How many moles of carbon dioxide are present?

Accepted Answer

$$0.500\ \mathrm{mol}$$

Question 5

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 6

Which element is a transition metal?

Accepted Answer

Fe

Question 7

Which of the following best describes the process of sublimation?

Accepted Answer

A solid changing directly to a gas

Question 8

Which of the following compounds is named correctly?

Accepted Answer

NaCl: sodium chloride

Question 9

What is the empirical formula of a compound that is 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 10

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

Accepted Answer

The properties of elements are periodic functions of their atomic numbers.

Question 11

Which of the following best explains why metals tend to form cations?

Accepted Answer

Metals have low ionization energies and lose electrons to achieve a stable octet.

Question 12

A student needs to convert $$5.0\ \mathrm{cm^3$} to$$ $$\mathrm{mL}. $$What is the correct answer?

Accepted Answer

$$5.0\ \mathrm{mL}$$

Question 13

Which of the following electron configurations represents a chloride ion ($$\mathrm{Cl^-}$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$

Question 14

Which of the following is an exothermic process?

Accepted Answer

Combustion of gasoline in a car engine

Question 15

A sample of gold has a mass of $$19.3\ \mathrm{g}$$ and a volume of $$1.00\ \mathrm{cm^3$}. $$What is the density of gold?

Accepted Answer

$$19.3\ \mathrm{g/cm^3$}$$

Question 16

Which of the following best describes the conservation of mass in a chemical reaction?

Accepted Answer

The total mass of reactants equals the total mass of products.

Question 17

Which of the following is the correct name for $$\mathrm{H_2SO_4}$$?

Accepted Answer

Sulfuric acid

Question 18

A compound has an empirical formula of $$\mathrm{CH_2$}$$ and a molar mass of $$56\ \mathrm{g/mol}. $$What is its molecular formula?

Accepted Answer

$$\mathrm{C_4H_8}$$

Question 19

Which of the following best describes the trend in atomic radius across a period from left to right?

Accepted Answer

Atomic radius decreases

Question 20

Which of the following is a correct statement about the scientific method?

Accepted Answer

It involves making observations, forming a hypothesis, conducting experiments, and drawing conclusions.

Question 21

A student is asked to find the percent composition of oxygen in $$\mathrm{H_2O}. $$What is the correct answer?

Accepted Answer

$$88.8\%$$

Introductory Chemistry Midterm Review Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard