2-10-20201

Calculate the correct number of moles AND formula units in 7.3 x 10-3 g of CaSO4. Avogadro's number is 6.022 × 1023.

5.4 × 10-5 moles of CaSO4 3.2 × 1019 formula units of CaSO4

How many grams of KMnO4 correspond to 3.13 × 1022 formula units of KMnO4? Avogadro's number is 6.022 × 1023.

8.21 g of KMnO4

A compound consists of atoms of ____ or more different ____ that are chemically bonded together.

Blank 1: two or 2 Blank 2: elements

A Lewis dot symbol consists of an element's symbol, surrounded by dots that represent its ____ electrons.

Blank 1: valence or outer shell

A particular hydrocarbon (a compound consisting only of C and H) contains 14.4% H by mass. If the molar mass of the compound is 85. ± 2 g/mol, what is the molecular formula?

C6H12

A compound has the empirical formula CH2O. What are the possible options for the molecular formula of this compound? Select all that apply.

C6H12O6 CH2O C2H4O2

The ionic compound CrCl3 is correctly named _____. a. chromium chloride b. chromium(III) chloride c. chromium trichloride

b.

Match each type of ion with the statement that correctly describes how to determine its charge using the periodic table. Instructions main-group cations anions The ion charge equals the group number. The ion charge is calculated by subtracting 8 from the last digit of the group number.

main-group cations: The ion charge equals the group number. anions: The ion charge is calculated by subtracting 8 from the last digit of the group number.

Which one of the following options gives the correct procedure to calculate the number of moles of a substance given the mass of a sample?

mass/ molar mass

The ____ ____ of a substance is the mass per mole of a substance, in units of g/mol.

molar mass

The _____ formula of a compound is an integer multiple of the _____ formula.

molecular; empirical

Which one of the following options gives the correct procedure to calculate the mass of a substance given the number of moles?

moles × molar mass

Which of the following provides the correct mathematical operation to convert the number of atoms of a sample to the number of moles?

number of atoms/ avogrados number

Arrange the necessary steps in order for finding the molecular formula of an unknown compound from mass percent data. Place the first step at the top of the list. Instructions

1. Assume 2. Convert 3. Derive 4. Divide 5. Multiply

Which of the following provides the correct mathematical operation to calculate the number of molecules in 2.0 mol of CH4?

2.0 mol × 6.022 × 10^23 molecules/mol

When the elements Mg and Cl form an ionic bond, Mg loses ____ electron(s) from the 3s orbital to form the Mg2+ cation. Cl gains ____ electron(s) in the 3p orbital to form the Cl- anion. Since the total number of electrons lost always equals the total number of electrons gained, the compound formed will contain ____ Mg2+ ion(s) for every ____ Cl- ion(s). Fill in the blanks with the appropriate numbers.

Blank 1: 2 or two Blank 2: 1 or one Blank 3: 1 or one Blank 4: 2 or two

e molecular formula of a compound having an empirical formula NH2 (ℳ = 32.05 g/mol) is N

Blank 1: 2 or two Blank 2: 4 or four

When naming a binary ionic compound, the ____ is always named first and the ____ second. To name the anion, the root of the nonmetal name is added to the suffix- _____ second. To name the anion, the root of the nonmetal name is added to the suffix _____.

Blank 1: cation Blank 2: anion Blank 3: ide Blank 4: oxide

Which of the following is NOT involved in determining the empirical formula of a compound from mass percent data?

The molar mass of the compound

Which of the following statements correctly describe the format used to represent an ionic compound? Select all that apply.

The number of atoms/ions in the formula is indicated by a subscript. In the formula of an ionic compound the cation is always placed first. Subscripts in the formula for an ionic compound are always reduced to the simplest ratio.

How is a monatomic main group cation properly named? Multiple choice question. a. By adding the word ion to the name of the element b. By changing the suffix of the element's name to -ide c. By placing a Roman numeral after the name of the element, indicating its charge

a. By adding the word ion to the name of the element

Which of the following statements correctly describe how to determine the charge of a monatomic ion using the periodic table? Select all that apply. a. Elements that form cations in Groups 1 and 2 form ions with a charge equal to the group number. b. The charge of most transition metal cations cannot readily be predicted from the periodic table. c. Most elements in Groups 14 to 17 will form an ion with a charge equal to (group number + 18). d. Zn always forms the Zn2+ ion.

a. Elements that form cations in Groups 1 and 2 form ions with a charge equal to the group number. b. The charge of most transition metal cations cannot readily be predicted from the periodic table. d. Zn always forms the Zn2+ ion.

Which of the following statements correctly describe how to name an ionic compound? Select all that apply. a. For a monatomic anion, the element name is changed to end in -ide. b. Greek prefixes are used to indicate the number of atoms of a particular element present. c. For a monatomic cation, the element name is changed to end in -ide. d. The cation is named first and the anion second. e. The ion with the higher charge is always named first.

a. For a monatomic anion, the element name is changed to end in -ide. d. The cation is named first and the anion second.

Consider the formation of an ionic bond between the elements potassium (K) and chlorine (Cl). Which of the following statements describe this process correctly? Select all that apply. Multiple select question. a. K loses one electron from its 4s orbital to form a K+ cation. b. The total number of electrons lost equals the total number of electrons gained. c. The formation of this bond requires two K atoms for every one Cl atom. d. Cl gains two electrons to form the Cl- anion. e. Both the K+ and Cl- ions have full outer shells containing 8 electrons.

a. K loses one electron from its 4s orbital to form a K+ cation. b. The total number of electrons lost equals the total number of electrons gained. e. Both the K+ and Cl- ions have full outer shells containing 8 electrons.

Which of the following statements correctly describe the format used to represent an ionic compound? Select all that apply. Multiple select question. a. Subscripts in the formula for an ionic compound are always reduced to the simplest ratio. b. Charges must be specifically written in the formula for an ionic compound. c. A subscript refers to the element following it. d. In the formula of an ionic compound the cation is always placed first. e. The number of atoms/ions in the formula is indicated by a subscript.

a. Subscripts in the formula for an ionic compound are always reduced to the simplest ratio. d. In the formula of an ionic compound the cation is always placed first. e. The number of atoms/ions in the formula is indicated by a subscript.

Consider the formula for the ionic compound Na2O. Which of the following statements correctly interpret this formula? Select all that apply. Multiple select question. a. The cation in this compound is Na+. b. The subscript 2 refers to the number of O atoms/ions in the formula. c. The compound consists of Na2O molecules. d. The compound contains 2 Na+ ions for every O2- ion. e. Charges are not included because they have been neutralized.

a. The cation in this compound is Na+. d. The compound contains 2 Na+ ions for every O2- ion.

Which of the following statements correctly describe molar mass? Select all that apply. a. The molar mass is the mass in grams per mole of the substance. b. The term molar mass applies to compounds but not elements. c. The periodic table can be used to calculate the molar mass of any substance. d. The units for molar mass are kg/mol.

a. The molar mass is the mass in grams per mole of the substance. c. The periodic table can be used to calculate the molar mass of any substance.

Which of the following statements correctly describe how to determine the charge of a monatomic ion using the periodic table? Select all that apply. a. Zn always forms the Zn2+ ion. b. The charge of most transition metal cations cannot readily be predicted from the periodic table. c. Elements that form cations in Groups 1 and 2 form ions with a charge equal to the group number. d. Most elements in Groups 14 to 17 will form an ion with a charge equal to (group number + 18).

a. Zn always forms the Zn2+ ion. b. The charge of most transition metal cations cannot readily be predicted from the periodic table. c. Elements that form cations in Groups 1 and 2 form ions with a charge equal to the group number.

Which of the following statements correctly describe ionic bonding? Select all that apply. Multiple select question. a. Positive and negative ions combine in individual units of two or three ions each. b. An ionic bond is the electrostatic attraction between two oppositely charged ions. c. Ionic bonding is typically observed when two nonmetals bond. d. Ionic bonding involves the transfer of electrons from the metal to the nonmetal.

b. An ionic bond is the electrostatic attraction between two oppositely charged ions. d. Ionic bonding involves the transfer of electrons from the metal to the nonmetal.

Which of the following statements correctly describe the format used to represent an ionic compound? Select all that apply. a. A subscript refers to the element following it. b. In the formula of an ionic compound the cation is always placed first. c. Subscripts in the formula for an ionic compound are always reduced to the simplest ratio. d. The number of atoms/ions in the formula is indicated by a subscript. e. Charges must be specifically written in the formula for an ionic compound.

b. In the formula of an ionic compound the cation is always placed first. c. Subscripts in the formula for an ionic compound are always reduced to the simplest ratio. d. The number of atoms/ions in the formula is indicated by a subscript.

The ionic compound CrCl3 is correctly named _____. Multiple choice question. a. chromium chloride b. chromium(III) chloride c. chromium trichloride

b. chromium(III) chloride

The compound Cu2O is correctly named ______. Multiple choice question. a. copper oxide b. copper(I) oxide c. copper(II) oxide d. dicopper oxide

b. copper(I) oxide

Which of the following statements correctly describe compounds? Select all that apply. Multiple select question. a. The properties of a compound are the same as the properties of its component elements. b. The components of a compound can be separated physically. c. A compound is a pure substance. d. A compound has a fixed mass ratio of its components. e. A compound contains a fixed number of atoms in its formula.

c. A compound is a pure substance. d. A compound has a fixed mass ratio of its components. e. A compound contains a fixed number of atoms in its formula.

Which of the following compounds has the largest molar mass? Multiple choice question. a. C6H6 b. SO2 c. H2SO4 d. CH2Cl2

c. H2SO4

Which statement about naming cations of main group metals is correct? a. The charge on a main group metal cation is specified in its name. b. When a metal forms a cation, the ending of the name of the metal is changed to -ide. c. When a metal forms a cation, the word ion is added to the name, without changing the name of the metal.

c. When a metal forms a cation, the word ion is added to the name, without changing the name of the metal.

The bond typically observed when a metal bonds to a nonmetal is the _____ bond. The metal atom _____ one or more valence electrons while the nonmetal _____ electrons. Multiple choice question. a. covalent; loses; gains b. ionic; gains; loses c. ionic; loses; gains d. covalent; gains; loses

c. ionic; loses; gains