Question 1

A substance is composed of diatomic molecules. 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 2

An element is a substance that

Accepted Answer

A)  can be broken down into simpler substances by physical means. 
B)  cannot be broken down into simpler substances by physical means. 
C)  can be broken down into simpler substances by chemical means. 
D)  cannot be broken down into simpler substances by chemical or physical means. 
A)  can be broken down into simpler substances by physical means. 
B)  cannot be broken down into simpler substances by physical means. 
C)  can be broken down into simpler substances by chemical means. 
D)  cannot be broken down into simpler substances by chemical or physical means.

Question 3

For the elements calcium, iron, and beryllium; choose the appropriate characterization of the set's chemical symbols from the response list.

Accepted Answer

A)  All symbols have one letter. 
B)  All symbols have two letters. 
C)  All symbols start with the same letter. 
D)  All symbols start with a letter not the first letter of the element's English name. 
A)  All symbols have one letter. 
B)  All symbols have two letters. 
C)  All symbols start with the same letter. 
D)  All symbols start with a letter not the first letter of the element's English name.

Question 4

Which of the following statements concerning mixtures is correct?

Accepted Answer

A)  The composition of a homogeneous mixture cannot vary. 
B)  A homogeneous mixture can have components present in two physical states. 
C)  A heterogeneous mixture containing only one phase is an impossibility. 
D)  More than one correct response 
E)  No correct response 
A)  The composition of a homogeneous mixture cannot vary. 
B)  A homogeneous mixture can have components present in two physical states. 
C)  A heterogeneous mixture containing only one phase is an impossibility. 
D)  More than one correct response 
E)  No correct response

Question 5

Which of the following substances contains same number of elements as atoms?

Accepted Answer

A)  HCN 
B)  H2O2 
C)  P4 
D)  H2CO3 
A)  HCN 
B)  H2O2 
C)  P4 
D)  H2CO3

Question 6

A substance has a variable composition. 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 7

When substance A reacts with substance B, a new substance C is formed. Based on this information

Accepted Answer

A)  Both A and B are elements. 
B)  B could be a compound. 
C)  C must be a compound. 
D)  More than one correct response. 
E)  No correct response. 
A)  Both A and B are elements. 
B)  B could be a compound. 
C)  C must be a compound. 
D)  More than one correct response. 
E)  No correct response.

Question 8

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

Accepted Answer

A)  barium, iron, nitrogen 
B)  selenium, nickel, strontium 
C)  silicon, zinc, hydrogen 
D)  iodine, xenon, titantium 
A)  barium, iron, nitrogen 
B)  selenium, nickel, strontium 
C)  silicon, zinc, hydrogen 
D)  iodine, xenon, titantium

Question 9

For the elements gold, lead, and bromine; choose the appropriate characterization of the set's chemical symbols from the response list.

Accepted Answer

A)  All symbols have one letter. 
B)  All symbols have two letters. 
C)  All symbols start with the same letter. 
D)  All symbols start with a letter not the first letter of the element's English name. 
A)  All symbols have one letter. 
B)  All symbols have two letters. 
C)  All symbols start with the same letter. 
D)  All symbols start with a letter not the first letter of the element's English name.

Question 10

A substance is silvery-gray in color. 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 11

Give the classification of matter when two substances exist with one phase present

Accepted Answer

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

Question 12

For the elements silver, sodium, and potassium; choose the appropriate characterization of the set's chemical symbols from the response list.

Accepted Answer

A)  All symbols have one letter. 
B)  All symbols have two letters. 
C)  All symbols start with the same letter. 
D)  All symbols start with a letter not the first letter of the element's English name. 
A)  All symbols have one letter. 
B)  All symbols have two letters. 
C)  All symbols start with the same letter. 
D)  All symbols start with a letter not the first letter of the element's English name.

Question 13

Which of the following statements concerning elemental abundances in Earth's crust is correct?

Accepted Answer

A)  One element accounts for over one-half of all atoms present. 
B)  Silicon and aluminum are the two most abundant elements in terms of atom percent. 
C)  Elemental abundances in Earth's crust closely parallel elemental abundances in the universe as a whole. 
D)  More than one correct response. 
E)  No correct response. 
A)  One element accounts for over one-half of all atoms present. 
B)  Silicon and aluminum are the two most abundant elements in terms of atom percent. 
C)  Elemental abundances in Earth's crust closely parallel elemental abundances in the universe as a whole. 
D)  More than one correct response. 
E)  No correct response.

Question 14

For the elements silicon, sulfur, and tin; choose the appropriate characterization of the set's chemical symbols from the response list.

Accepted Answer

A)  All symbols have one letter. 
B)  All symbols have two letters. 
C)  All symbols start with the same letter. 
D)  All symbols start with a letter not the first letter of the element's English name. 
A)  All symbols have one letter. 
B)  All symbols have two letters. 
C)  All symbols start with the same letter. 
D)  All symbols start with a letter not the first letter of the element's English name.

Question 15

Which of the following substances has the number of elements present and number of atoms present differ by a factor of two?

Accepted Answer

A)  HCN 
B)  H2O2 
C)  P4 
D)  H2CO3 
A)  HCN 
B)  H2O2 
C)  P4 
D)  H2CO3

Question 16

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 classification "triatomic molecule" denotes molecules in which three different elements are present.
(2) Common physical properties for a substance include color, melting point, boiling point, flammability, and hardness.
(3) The chemical formulas HN3 and NH3 represent two ways for denoting the same compound.

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 17

Which of the following statements about compounds and mixtures is correct?

Accepted Answer

A)  Both mixtures and compounds must contain two or more kinds of atoms. 
B)  Mixtures must always contain at least one compound. 
C)  Both mixtures and compounds can have a variable composition. 
D)  More than one correct response. 
E)  No correct response. 
A)  Both mixtures and compounds must contain two or more kinds of atoms. 
B)  Mixtures must always contain at least one compound. 
C)  Both mixtures and compounds can have a variable composition. 
D)  More than one correct response. 
E)  No correct response.

Question 18

Which of the following substances contains fewer atoms of one kind than other kinds?

Accepted Answer

A)  HCN 
B)  H2O2 
C)  P4 
D)  H2CO3 
A)  HCN 
B)  H2O2 
C)  P4 
D)  H2CO3

Question 19

A substance has a high density. 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 20

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 compound must always contain two or more types of atoms.
(2) The description "one substance present, two phases present, all molecules are homoatomic" is consistent with a sample that is an element.
(3) The number of known elements is less than one hundred.

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.

Exam 1: Basic Concepts About Matter

A substance is composed of diatomic molecules. Choose the appropriate classification from the response list below:

An element is a substance that

For the elements calcium, iron, and beryllium; choose the appropriate characterization of the set's chemical symbols from the response list.

Which of the following statements concerning mixtures is correct?

Which of the following substances contains same number of elements as atoms?

A substance has a variable composition. Choose the appropriate classification from the response list below:

When substance A reacts with substance B, a new substance C is formed. Based on this information

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

For the elements gold, lead, and bromine; choose the appropriate characterization of the set's chemical symbols from the response list.

A substance is silvery-gray in color. Choose the appropriate classification from the response list below:

Give the classification of matter when two substances exist with one phase present

For the elements silver, sodium, and potassium; choose the appropriate characterization of the set's chemical symbols from the response list.

Which of the following statements concerning elemental abundances in Earth's crust is correct?

For the elements silicon, sulfur, and tin; choose the appropriate characterization of the set's chemical symbols from the response list.

Which of the following substances has the number of elements present and number of atoms present differ by a factor of two?

Which of the following statements about compounds and mixtures is correct?

Which of the following substances contains fewer atoms of one kind than other kinds?

A substance has a high density. Choose the appropriate classification from the response list below:

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

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