Question 1

If iodide ions (I⁻)were dissolved in water,they would be attracted to

Accepted Answer

A)  A only. 
B)  B only. 
C)  C only. 
D)  A and C. 
A)  A only. 
B)  B only. 
C)  C only. 
D)  A and C.

Question 2

You are given an unknown substance and asked to determine whether it is polar or nonpolar.The easiest way to do this would be to

Accepted Answer

A)  determine whether the compound is held together by hydrogen bonds. 
B)  determine the number of electrons in the compound's outer shell. 
C)  mix the compound with an ionic substance to see whether its bonds can withstand the pressure. 
D)  determine whether the compound dissolves in water. 
A)  determine whether the compound is held together by hydrogen bonds. 
B)  determine the number of electrons in the compound's outer shell. 
C)  mix the compound with an ionic substance to see whether its bonds can withstand the pressure. 
D)  determine whether the compound dissolves in water.

Question 3

Nucleotides

Accepted Answer

A)  are the building blocks of proteins. 
B)  are involved in every chemical reaction in the cell. 
C)  form physical structures such as hair. 
D)  are the building blocks of nucleic acids. 
A)  are the building blocks of proteins. 
B)  are involved in every chemical reaction in the cell. 
C)  form physical structures such as hair. 
D)  are the building blocks of nucleic acids.

Question 4

Use the molecule of ethanol shown below to match the numbers with the questions they answer.Numbers may be used more than once or not at all.  
-What is the total number of carbon atoms?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 4 
E) 8 
A) 0 
B) 1 
C) 2 
D) 4 
E) 8

Question 5

A solution with a pH of 3 is

Accepted Answer

A)  acidic. 
B)  basic. 
C)  nonpolar. 
D)  neutral. 
A)  acidic. 
B)  basic. 
C)  nonpolar. 
D)  neutral.

Question 6

The pH value of pure water is 7.0.When Ralph measures the pH of rainwater in his neighborhood,he finds the pH value is 6.0.Which of these solutions has a higher concentration of hydrogen ions? What is the difference in the hydrogen ion concentration?

Accepted Answer

The rainwater has a 10-fold in

Question 7

The positively charged subatomic particle is located in the ________.

Accepted Answer

The answer of The positively charged subatomic particle is located...

Question 8

Using the answer choices below,match the characteristic with its macromolecule class.
-participate in nearly every chemical reaction in living systems

Accepted Answer

A) lipids 
B) carbohydrates 
C) nucleic acids 
D) proteins 
A) lipids 
B) carbohydrates 
C) nucleic acids 
D) proteins

Question 9

Gina makes vinaigrette dressing with olive oil and vinegar and then shakes the jar vigorously.For a few minutes it appears as if the oil and vinegar have mixed.Then,she notices the two liquids separating from each other.Describe why these two liquids do not stay together even after vigorous mixing.

Accepted Answer

Oil is a nonpolar,hydrophobic substance

Question 10

In the chemical reaction that forms hydrogen peroxide (H₂O₂),hydrogen and oxygen share electrons,creating ________ bonds between the two atoms.

Accepted Answer

A)  covalent 
B)  peptide 
C)  hydrogen 
D)  ionic 
A)  covalent 
B)  peptide 
C)  hydrogen 
D)  ionic

Question 11

The element ________ makes up the chemical backbone of most molecules on planet Earth.

Accepted Answer

The answer of The element ________ makes up the chemical...

Question 12

Which of the following are composed of the same monomers?

Accepted Answer

A)  proteins and DNA 
B)  RNA and cellulose 
C)  starch and cellulose 
D)  cholesterol and sucrose 
A)  proteins and DNA 
B)  RNA and cellulose 
C)  starch and cellulose 
D)  cholesterol and sucrose

Question 13

Nitrogen has seven protons,seven neutrons,and seven electrons.What is the atomic mass of nitrogen?

Accepted Answer

A)  0 
B)  7 
C)  14 
D)  21 
A)  0 
B)  7 
C)  14 
D)  21

Question 14

Astronauts returning from outer space studied samples taken from their lunar landing.They found that one of their samples was coated with organic compounds.Which of the following statements must be correct about their samples?

Accepted Answer

A)  The compounds must be covered with ammonia (NH₃) and water vapor. 
B)  The samples must lack water, but contain DNA. 
C)  The samples must contain carbon atoms. 
D)  The specimen must lack water, pesticides, and added hormones. 
A)  The compounds must be covered with ammonia (NH₃) and water vapor. 
B)  The samples must lack water, but contain DNA. 
C)  The samples must contain carbon atoms. 
D)  The specimen must lack water, pesticides, and added hormones.

Question 15

Which of the following solutions has the highest concentration of free H⁺ ions?

Accepted Answer

A)  pH 1 
B)  pH 4 
C)  pH 7 
D)  pH 14 
A)  pH 1 
B)  pH 4 
C)  pH 7 
D)  pH 14

Question 16

The genetic material found in all living things is made of building blocks called

Accepted Answer

A)  nucleotides. 
B)  monosaccharides. 
C)  phospholipids. 
D)  steroids. 
A)  nucleotides. 
B)  monosaccharides. 
C)  phospholipids. 
D)  steroids.

Question 17

Hydrogen and oxygen atoms are held together within an individual water molecule by ________ bonds.

Accepted Answer

A)  hydrogen 
B)  peptide 
C)  polar covalent 
D)  ionic 
A)  hydrogen 
B)  peptide 
C)  polar covalent 
D)  ionic

Question 18

An acid is a polar substance that dissolves in water and

Accepted Answer

A)  becomes nonpolar. 
B)  leaves behind an OH⁻ ion. 
C)  accepts hydrogen ions from the solution. 
D)  donates hydrogen ions to the solution. 
A)  becomes nonpolar. 
B)  leaves behind an OH⁻ ion. 
C)  accepts hydrogen ions from the solution. 
D)  donates hydrogen ions to the solution.

Question 19

Neighboring water molecules are held together with hydrogen bonds because

Accepted Answer

A)  partially negatively charged oxygen atoms and partially positively charged hydrogen atoms on separate water molecules are attracted to one another. 
B)  the hydrogen and oxygen atoms within a single water molecule share electrons equally. 
C)  the oxygen and hydrogen atoms that participate in hydrogen bonding are sharing electrons within a single valence shell. 
D)  ionic interactions repel water molecules from hydrophobic oils that may be present in a solution. 
A)  partially negatively charged oxygen atoms and partially positively charged hydrogen atoms on separate water molecules are attracted to one another. 
B)  the hydrogen and oxygen atoms within a single water molecule share electrons equally. 
C)  the oxygen and hydrogen atoms that participate in hydrogen bonding are sharing electrons within a single valence shell. 
D)  ionic interactions repel water molecules from hydrophobic oils that may be present in a solution.

Question 20

Sodium chloride (table salt)is formed when positively charged sodium ions and negatively charged chloride ions are chemically attracted to each other.This attraction is best described as a(n)

Accepted Answer

A)  hydrogen bond. 
B)  ionic bond. 
C)  covalent bond. 
D)  solution. 
A)  hydrogen bond. 
B)  ionic bond. 
C)  covalent bond. 
D)  solution.

Exam 3: Chemistry of Life

If iodide ions (I⁻)were dissolved in water,they would be attracted to

You are given an unknown substance and asked to determine whether it is polar or nonpolar.The easiest way to do this would be to

Nucleotides

Use the molecule of ethanol shown below to match the numbers with the questions they answer.Numbers may be used more than once or not at all. -What is the total number of carbon atoms?

A solution with a pH of 3 is

The pH value of pure water is 7.0.When Ralph measures the pH of rainwater in his neighborhood,he finds the pH value is 6.0.Which of these solutions has a higher concentration of hydrogen ions? What is the difference in the hydrogen ion concentration?

The positively charged subatomic particle is located in the ________.

Using the answer choices below,match the characteristic with its macromolecule class. -participate in nearly every chemical reaction in living systems

Gina makes vinaigrette dressing with olive oil and vinegar and then shakes the jar vigorously.For a few minutes it appears as if the oil and vinegar have mixed.Then,she notices the two liquids separating from each other.Describe why these two liquids do not stay together even after vigorous mixing.

In the chemical reaction that forms hydrogen peroxide (H₂O₂),hydrogen and oxygen share electrons,creating ________ bonds between the two atoms.

The element ________ makes up the chemical backbone of most molecules on planet Earth.

Which of the following are composed of the same monomers?

Nitrogen has seven protons,seven neutrons,and seven electrons.What is the atomic mass of nitrogen?

Astronauts returning from outer space studied samples taken from their lunar landing.They found that one of their samples was coated with organic compounds.Which of the following statements must be correct about their samples?

Which of the following solutions has the highest concentration of free H⁺ ions?

The genetic material found in all living things is made of building blocks called

Hydrogen and oxygen atoms are held together within an individual water molecule by ________ bonds.

An acid is a polar substance that dissolves in water and

Neighboring water molecules are held together with hydrogen bonds because

Sodium chloride (table salt)is formed when positively charged sodium ions and negatively charged chloride ions are chemically attracted to each other.This attraction is best described as a(n)

The Nature of Science

Evaluating Scientific Claims

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

Adaptation and Species

The History of Life

Bacteria and Archaea

Plants, Fungi, and Protists

Animals and Human Evolution

General Principles of Ecology

Growth of Populations

Communities of Organisms

Ecosystems

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