Question 1

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

Accepted Answer

A compound is made of two or more elements chemically combined in a fixed ratio, while a mixture consists of two or more substances physically combined in variable ratios.

Question 2

Which of the following statements about metals is FALSE?

Accepted Answer

Most metals are gases at room temperature.

Question 3

Which of the following is the correct empirical formula for hexane, $$\mathrm{C_6H_{14}}$$?

Accepted Answer

$$\mathrm{C_3H_7}$$

Question 4

Which of the following compounds is an example of a molecular element?

Accepted Answer

Ozone ($$\mathrm{O_3$})$$

Question 5

What is the correct name for $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 6

Which of the following best describes the bonding in $$\mathrm{CO_2$}$$?

Accepted Answer

Covalent bonds between nonmetal atoms

Question 7

A hydrate is best described as:

Accepted Answer

An ionic compound containing a specific number of water molecules per formula unit

Question 8

Which of the following is the correct formula for magnesium sulfate heptahydrate?

Accepted Answer

$$\mathrm{$$MgSO_4$$ \cdot 7H_2O}$$

Question 9

Which of the following best explains why ionic compounds are electrically neutral?

Accepted Answer

The total positive charge of the cations equals the total negative charge of the anions.

Question 10

Which of the following is the correct name for $$\mathrm{N_2H_4}$$?

Accepted Answer

Dinitrogen tetrahydride

Question 11

Which of the following statements about empirical and molecular formulas is TRUE?

Accepted Answer

The empirical formula shows the simplest whole-number ratio of atoms in a compound.

Question 12

Which of the following is a property of nonmetals?

Accepted Answer

Poor conductors of heat and electricity

Question 13

Which of the following is the correct formula for aluminum oxide, given that aluminum forms $$\mathrm{Al$$^{3+}$$}$$ and oxide forms $$\mathrm{O$$^{2-}$$}$$?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 14

Which of the following best describes a metalloid?

Accepted Answer

An element that exhibits properties of both metals and nonmetals

Question 15

Which of the following is the correct name for $$\mathrm{$$CrBr_3$$}$$?

Accepted Answer

Chromium(III) bromide

Question 16

Which of the following is the correct formula for sulfur hexabromide?

Accepted Answer

$$\mathrm{$$SBr_6$$}$$

Question 17

Which of the following best describes the process of forming an ionic bond?

Accepted Answer

A metal transfers electrons to a nonmetal, forming cations and anions that are held together by electrostatic attraction.

Question 18

Which of the following is the correct name for $$\mathrm{$$CoCl_2$$ \cdot 6H_2O}$$?

Accepted Answer

Cobalt(II) chloride hexahydrate

Question 19

Which of the following is the correct formula for dinitrogen tetrahydride?

Accepted Answer

$$\mathrm{N_2H_4}$$

Question 20

Which of the following best describes the difference between an empirical formula and a molecular formula?

Accepted Answer

The empirical formula shows the simplest ratio of atoms, while the molecular formula shows the actual number of atoms in a molecule.

Matter, Elements, Compounds, and Nomenclature: Foundations of General Chemistry

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