Question 1

A substance is reacted with chlorine gas. The substance:

Accepted Answer

A)  could be an element or a compound 
B)  could be an element but not a compound 
C)  could be a compound but not an element 
D)  could not be an element nor a compound 
A)  could be an element or a compound 
B)  could be an element but not a compound 
C)  could be a compound but not an element 
D)  could not be an element nor a compound D

Question 2

Which of the following statements is correct?

Accepted Answer

A)  Elements, but not compounds, are pure substances. 
B)  Compounds, but not elements, are pure substances. 
C)  Both elements and compounds are pure substances. 
D)  Neither elements nor compounds are pure substances. 
A)  Elements, but not compounds, are pure substances. 
B)  Compounds, but not elements, are pure substances. 
C)  Both elements and compounds are pure substances. 
D)  Neither elements nor compounds are pure substances. C

Question 3

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1) A basis for distinguishing between an element and a compound is whether the substance can be decomposed into other substances using chemical means.
(2) Current chemical theory strongly suggests that all naturally occurring elements have been identified.
(3) The elements silver, gold, and aluminum all have chemical symbols that start with the letter A.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. A

Question 4

Consider the chemical formulas CoI2 and COI2. It is true that they

Accepted Answer

A)  contain identical kinds of atoms 
B)  identify the same compound 
C)  contain different kinds and numbers of atoms 
D)  can be described by none of the above 
A)  contain identical kinds of atoms 
B)  identify the same compound 
C)  contain different kinds and numbers of atoms 
D)  can be described by none of the above

Question 5

A substance reacts vigorously with chlorine. Choose the appropriate classification from the response list below:

Accepted Answer

A)  could be an element or a compound 
B)  could be an element but not a compound 
C)  could be a compound but not an element 
D)  could not be an element nor a compound 
A)  could be an element or a compound 
B)  could be an element but not a compound 
C)  could be a compound but not an element 
D)  could not be an element nor a compound

Question 6

In which of the following sequences of elements does each of the elements have a one-letter chemical symbol?

Accepted Answer

A)  indium, carbon, silver 
B)  iodine, boron, tungsten 
C)  antimony, boron, nitrogen 
D)  nitrogen, germanium, bromine 
A)  indium, carbon, silver 
B)  iodine, boron, tungsten 
C)  antimony, boron, nitrogen 
D)  nitrogen, germanium, bromine

Question 7

In which of the following pairs of properties are both properties chemical properties?

Accepted Answer

A)  freezes at 10F1F1F1S1F1F1F10C and nonflammable 
B)  decomposes at 500F1F1F1S1F1F1F10C and reacts with bromine 
C)  poor conductor of heat and is reddish brown in color 
D)  has a low density and is very hard 
A)  freezes at 10F1F1F1S1F1F1F10C and nonflammable 
B)  decomposes at 500F1F1F1S1F1F1F10C and reacts with bromine 
C)  poor conductor of heat and is reddish brown in color 
D)  has a low density and is very hard

Question 8

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1) When the formula for a compound contains parentheses it is an indication that the compound is unstable and subject to decomposition.
(2) The fact that an unknown substance reacts with chlorine is insufficient basis for classifying the unknown as a compound.
(3) All chemical symbols use a two-letter notation to represent the name of an element.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 9

Which of the following statements concerning the known elements is correct?

Accepted Answer

A)  No new elements have been identified within the last 40 years. 
B)  Most elements occur naturally. 
C)  108 elements are known at present 
D)  Scientists have synthesized all possible non-natural elements. 
A)  No new elements have been identified within the last 40 years. 
B)  Most elements occur naturally. 
C)  108 elements are known at present 
D)  Scientists have synthesized all possible non-natural elements.

Question 10

In which of the following pairs of chemical formulas do the two members of the pair contain the same number of elements as well as the same number of atoms?

Accepted Answer

A)  Cs and CS 
B)  CoBr2 and COBr2 
C)  CoCl2 and CoCl3 
D)  NH4Br and NiSO4 
A)  Cs and CS 
B)  CoBr2 and COBr2 
C)  CoCl2 and CoCl3 
D)  NH4Br and NiSO4

Question 11

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1) No more than two visibly distinct phases may be present in a homogeneous mixture.
(2) Elements are chemically rather than physically combined in a compound.
(3) A common characteristic for both solids and liquids is a definite volume.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 12

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1) The determination of a physical property of a substance causes no change in the identity of the substance.
(2) Matter is anything that has mass, occupies space, and can be seen by the naked eye.
(3) The two most abundant elements in the Earth's crust are oxygen and carbon.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 13

Give the classification of matter when two substances exist with two phases present and the substance cannot be decomposed by chemical means

Accepted Answer

A)  heterogeneous mixture 
B)  homogeneous mixture 
C)  compound 
D)  element 
A)  heterogeneous mixture 
B)  homogeneous mixture 
C)  compound 
D)  element

Question 14

When a substance undergoes a chemical change it is always true that

Accepted Answer

A)  it liquifies 
B)  it changes from a solid to a gas 
C)  it is converted to a new kind of matter with a different composition 
D)  the temperature of the substance increases 
A)  it liquifies 
B)  it changes from a solid to a gas 
C)  it is converted to a new kind of matter with a different composition 
D)  the temperature of the substance increases

Question 15

Which of the following pairings of chemical formulas and "molecular descriptions" is incorrect?

Accepted Answer

A)  LiCN and "triatomic" 
B)  KCl and "heteroatomic" 
C)  N2 and "homoatomic" 
D)  SiO2 and "diatomic" 
A)  LiCN and "triatomic" 
B)  KCl and "heteroatomic" 
C)  N2 and "homoatomic" 
D)  SiO2 and "diatomic"

Question 16

A substance that cannot be separated into two or more substances using physical means

Accepted Answer

A)  must be an element. 
B)  could be a compound. 
C)  must be a pure substance. 
D)  more than one correct response 
E)  no correct response 
A)  must be an element. 
B)  could be a compound. 
C)  must be a pure substance. 
D)  more than one correct response 
E)  no correct response

Question 17

In which of the following sequences of elements do all members of the sequence have chemical symbols starting with the same letter?

Accepted Answer

A)  sulfur, silicon, sodium 
B)  gold, silver, aluminum 
C)  potassium, phosphorus, lead 
D)  more than one correct response 
E)  no correct response 
A)  sulfur, silicon, sodium 
B)  gold, silver, aluminum 
C)  potassium, phosphorus, lead 
D)  more than one correct response 
E)  no correct response

Question 18

Which of the following is a correct description for a sample of ice cubes in water?

Accepted Answer

A)  one phase present, one substance present 
B)  one phase present, two substances present 
C)  two phases present, one substance present 
D)  two phases present, two substances present 
A)  one phase present, one substance present 
B)  one phase present, two substances present 
C)  two phases present, one substance present 
D)  two phases present, two substances present

Question 19

Which one of the following statements about atoms is incorrect?

Accepted Answer

A)  An atom is the smallest "piece" of an element that can exist and still have the properties of the element. 
B)  Free isolated atoms are rarely encountered in nature. 
C)  Atoms may be decomposed using chemical change. 
D)  Only one kind of atom may be present in a homoatomic molecule. 
A)  An atom is the smallest "piece" of an element that can exist and still have the properties of the element. 
B)  Free isolated atoms are rarely encountered in nature. 
C)  Atoms may be decomposed using chemical change. 
D)  Only one kind of atom may be present in a homoatomic molecule.

Question 20

A substance has a freezing point of -20F1F1F1S1F1F1F10C. This is an example of a:

Accepted Answer

A)  physical property 
B)  chemical property 
C)  physical change 
D)  chemical change 
A)  physical property 
B)  chemical property 
C)  physical change 
D)  chemical change

Exam 1: Basic Concepts About Matter

A substance is reacted with chlorine gas. The substance:

Which of the following statements is correct?

Consider the chemical formulas CoI2 and COI2. It is true that they

A substance reacts vigorously with chlorine. Choose the appropriate classification from the response list below:

In which of the following sequences of elements does each of the elements have a one-letter chemical symbol?

In which of the following pairs of properties are both properties chemical properties?

Which of the following statements concerning the known elements is correct?

In which of the following pairs of chemical formulas do the two members of the pair contain the same number of elements as well as the same number of atoms?

Give the classification of matter when two substances exist with two phases present and the substance cannot be decomposed by chemical means

When a substance undergoes a chemical change it is always true that

Which of the following pairings of chemical formulas and "molecular descriptions" is incorrect?

A substance that cannot be separated into two or more substances using physical means

In which of the following sequences of elements do all members of the sequence have chemical symbols starting with the same letter?

Which of the following is a correct description for a sample of ice cubes in water?

Which one of the following statements about atoms is incorrect?

A substance has a freezing point of -20C. This is an example of a:

Measurements in Chemistry

Atomic Structure and the Periodic Table

Chemical Bonding: the Ionic Bond Model

Chemical Bonding: the Covalent Bond Model

Chemical Calculations: Formula Masses, Moles, and Chemical Equations

Gases, Liquids, and Solids

Solutions

Chemical Reactions

Acids, Bases, and Salts

Nuclear Chemistry

Saturated Hydrocarbons

Unsaturated Hydrocarbons

Alcohols, Phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids, Esters, and Other Acid Derivatives

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes and Vitamins

Nucleic Acids

Biochemical Energy Production

Carbohydrate Metabolism

Lipid Metabolism

Protein Metabolism

Filters

Consider the chemical formulas CoI₂ and COI₂. It is true that they