Chapter 2 LearnSmart Part 2

main group; transition

All elements in groups 1A to 8A of the periodic table are called the _____ elements or representative elements, while the elements in the B groups are called the _____ metals.

A and B

Consider the formula for the ionic compound Na2O. Which of the following statements correctly interpret this formula? A) The cation in this compound is Na+ B) The compound contains 2 Na+ ions for every O2- ion C) Charges are not included because they have been neutralized D) The subscript 2 refers to the number of O atoms/ions in the formula E) The compound consists of Na2O molecules

formula; periodic; sum

Formula and molecular masses are calculated using the chemical _____ of the relevant compound and atomic masses obtained from the _____ table. The _____ of the atomic masses in the correct proportions gives the formula or molecular mass of the compound.

fewer; more

Many polyatomic ions are oxoanions, containing a nonmetal bonded to one or more oxygen atoms. If there are two such ions in a family, the ion with _____ oxygen atoms is named with the suffix -ite while the ion with _____ oxygen atoms is given the suffix -ate.

ionic; cation

Roman numerals are used in naming _____ compounds containing a metal that can form more than one _____. The Roman numeral specifies the charge on the metal.

copper(I) oxide

The compound Cu2O is correctly named _____.

sulfide

The compound MgS is correctly named magnesium _____.

D

The formula mass of K2CO3 is equal to _____. A) 99.11 amu B) 162.23 amu C) 114.21 amu D) 138.21 amu

C

What is the correct name for the ionic compound Li3N? A) lithium trinitrogen B) trilithium nitride C) lithium nitride D) lithium(III) nitride

sodium carbonate

What is the correct systematic name for the compound Na2CO3?

atoms; prefix; one

When naming a binary covalent compound, the number of _____ of each element is indicated by a Greek numeral _____. The first element in the name is numbered only when more than _____ atom of that element is present.

cation, -ide, oxide

When naming an ionic compound, the _____ is always named first. To name the anion, the root of the nonmetal name is added to the suffix _____. The anion O2- is therefore named _____.

D

Which of the following correctly defines a formula unit? A) The simplest unit that represents the basic crystal structure of an ionic compound B) The simplest form for the basic unit in any chemical compound C) The simplest ratio representing the numbers of each element in a molecule of an ionic compound D) The simplest ratio representing the relative numbers of cations and anions in an ionic compound

D

Which of the following equations will give the correct formula mass of the compound Fe(ClO4)2? A) 55.85 + 4(35.45) + 8(16.00) B) 55.85 + 2(35.45) + 2(16.00) C) 2(55.85) + 2 (35.45) + 8(16.00) D) 55.85 + 2(35.45) + 8(16.00)

A, B, and D

Which of the following ionic combinations will result in an ionic compound that has a balanced number of positive and negative charges? A) 2Li+ and S2- B) Ca2+ and 2F- C) K+ and O2- D) Na+ and Br- E) Mg2+ and Cl-

B

Which of the following is the correct name for the covalent compound NO2? A) nitrogen oxide B) nitrogen dioxide C) nitride dioxide D) mononitrogen dioxide

A and E

Which of the following options are correct names for ionic compounds? A) copper(II) oxide B) sodium(I) bromide C) calcium difluoride D) chromium sulfide E) potassium chloride

A, B, and D

Which of the following options correctly describe how to calculate a molecular or formula mass for a compound? A) the atomic mass of a cation or anion is practically the same as the mass of the neutral element B) In a formula such as Ca(NO3)2, all the numbers of atoms inside the parentheses must be multiplied by 2 because of the subscript 2 C) In a formula such as N2O, the atomic masses of both elements should be multiplied by 2 D) The formula/molecular mass is given by the sum of the masses of the component elements in the correct proportions

A, B, and E

Which of the following options correctly describe how to determine the charge on a monatomic ion using the periodic table? A) The charge of most transition metal cations can not readily be predicted from the periodic table B) For main-group cations, the ion charge equals the A-group number C) For anions, the ion charge equals the A-group number plus 8 D) For anions, the ion charge equals the B-group example E) Ca is in group 2A and therefore forms the Ca2+ ion

A, B, and E

Which of the following options correctly describes the arrangement of the periodic table? A) The elements in the upper right portion of the periodic table are nonmetals B) The horizontal rows of the periodic table are called periods C) The groups are numbered 1 to 7 D) Elements in the modern periodic table are in order of increasing atomic mass E) Elements in the same group have similar chemical properties

A, C, and D

Which of the following options describe the correct format used to represent an ionic compound? A) The number of atoms/ions in the formula is indicated by a subscript B) Charges must be specifically written in the formula for an ionic compound C) Subscripts in the formula for an ionic compound are usually reduced to the simplest ratio D) In the formula of an ionic compound the cation is always placed first E) A subscript refers to the element following it

NH3

ammonia

metalloid

an element that has properties between those of metals and nonmetals

metal

an element that is a good conductor of heat and electricity, has a shiny surface, is malleable and ductile

nonmetal

an element that is generally a gas or a dull brittle solid at room temperature, and is a poor conductor of heat and electricity

CH4

methane

H2O

water