Question 1

Which statement about a bond between sodium and chlorine is incorrect?

Accepted Answer

A)   Na is the chemical symbol for sodium.
B)   Chlorine donates an electron.
C)   Chlorine becomes negatively charged.
D)   Sodium becomes positively charged.
E)   The bond that is formed is a strong bond.

Question 2

What do a lemon,a toaster oven,and sand grains have in common?

Accepted Answer

A)   All are composed of matter and energy.
B)   All are alive.
C)   All are composed of organic molecules.
D)   All are acidic.
E)   All are basic.

Question 3

The atomic number of an atom or element is the number of

Accepted Answer

A)   neutrons in the nucleus.
B)   electrons in the nucleus.
C)   protons in the nucleus.
D)   neutrons in the orbitals.
E)   protons in the orbitals.

Question 4

Blood is closely maintained at a pH of 7.4.A patient whose blood pH drops below 7.35 is suffering from metabolic acidosis and can go into a coma.What happens to the concentration of H⁺ ions in a patient with a blood pH of 6.4?

Accepted Answer

A)   H⁺ concentration is decreased 10-fold.
B)   H⁺ concentration is decreased 2-fold.
C)   H⁺ concentration is increased 2-fold.
D)   H⁺ concentration is decreased 4-fold.
E)   H⁺ concentration is increased 10-fold.

Question 5

Evaporation is

Accepted Answer

A)   the conversion of a liquid into a vapor.
B)   the conversion of a solid into a vapor.
C)   the conversion of a vapor into a liquid.
D)   the conversion of a vapor into a solid.
E)   All answers are correct.

Question 6

Isotopes of the same element are different from one another in that

Accepted Answer

A)   they have a different number of protons.
B)   they have a different number of neutrons.
C)   they have a different number of electrons.
D)   they are a different element.
E)   only one of the isotopes is matter.

Question 7

A substance with a pH of 7 is

Accepted Answer

A)   a weak acid.
B)   a weak base.
C)   neutral.
D)   a strong acid.
E)   a strong base.

Question 8

An acid

Accepted Answer

A)   has a value above 7 on the pH scale.
B)   is a chemical that takes hydrogen ions from a solution.
C)   has a value of 7 on the pH scale.
D)   is a chemical that adds hydrogen ions to a solution.
E)   All answers are correct.

Question 9

If you were told to sort cards into boxes after a lab on elements,you would put into a slot labelled "Mass Number" any card with text that included the total number of

Accepted Answer

A)   protons, neutrons, and electrons of an atom.
B)   protons and electrons of an atom.
C)   protons and neutrons of an atom.
D)   neutrons and electrons of an atom.
E)   protons of an atom.

Question 10

Scientists use carbon dating to determine the age of fossils. 14C is a rare isotope of carbon that has a half life of 5730 years and decays into 14N. By measuring the amount of 14C remaining in a fossil, scientists can estimate when the organism died to within 60,000 years. The atomic numbers of C is 6 and of N is 7.
-The most common isotope of carbon is ¹²C.¹⁴C has ____ than ¹²C.

Accepted Answer

A)   more protons
B)   more neutrons
C)   fewer neutrons
D)   fewer protons
E)   more electrons

Question 11

Hydrogen,nitrogen,carbon,and oxygen account for 96% of the human body.These elements are

Accepted Answer

A)   also the main elements in organic molecules.
B)   rare in nonhuman organisms.
C)   rare on Earth.
D)   always bonded by hydrogen bonds.
E)   All answers are correct.

Question 12

In a covalent bond

Accepted Answer

A)   atoms share electrons.
B)   atoms of opposite charges attract each other.
C)   atoms share protons.
D)   atoms share neutrons.
E)   atoms are repelled by each other.

Question 13

Water is best described as which of the following?

Accepted Answer

A)   an ion
B)   a nonpolar molecule
C)   an atom
D)   a polar molecule
E)   an element

Question 14

Scientists use carbon dating to determine the age of fossils. 14C is a rare isotope of carbon that has a half life of 5730 years and decays into 14N. By measuring the amount of 14C remaining in a fossil, scientists can estimate when the organism died to within 60,000 years. The atomic numbers of C is 6 and of N is 7.
-¹⁴C and ¹⁴N have the same

Accepted Answer

A)   atomic number.
B)   number of protons.
C)   mass number.
D)   number of neutrons.
E)   number of electrons.

Question 15

You encounter a new compound that is bright purple and smells of violets.It sticks to surfaces in a way similar to water and can replace water in the running of living cells.You might expect that this new molecule will make

Accepted Answer

A)   covalent bonds.
B)   ionic bonds.
C)   hydrogen bonds.
D)   hydrophobic bonds.
E)   peptide bonds.

Question 16

If a carbohydrate polymer contains only two monomer units,such as sucrose made from glucose and fructose,it is called a(n)

Accepted Answer

A)   disaccharide.
B)   polysaccharide.
C)   monosaccharide.
D)   oligosaccharide.
E)   complex carbohydrate.

Question 17

Organic molecules are defined as chemical compounds that contain

Accepted Answer

A)   hydrophilic solutions.
B)   isotopes of carbon.
C)   ionically bonded atoms.
D)   strong hydrogen bonds.
E)   carbon and hydrogen.

Question 18

Within a single molecule of water,________ bonds form between oxygen and hydrogen.

Accepted Answer

A)   ionic
B)   covalent
C)   hydrogen
D)   hydrophobic
E)   nuclear

Question 19

As part of a lab practical,you need to attach labels about chemical models.For the bond between amino acids,you would add a label describing that it is

Accepted Answer

A)   an ionic bond in proteins.
B)   a covalent bond in carbohydrates.
C)   a covalent bond in proteins.
D)   an ionic bond in carbohydrates.
E)   a hydrogen bond in nucleic acids.

Question 20

For most atoms,the outermost electron shell would be full if it contained

Accepted Answer

A)   one electron.
B)   four electrons.
C)   eight electrons.
D)   sixteen electrons.

Exam 2: The Chemistry of Life

Water is best described as which of the following?

Correct Answer
verified

Correct Answer
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Evaporation is

Correct Answer
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Organic molecules are defined as chemical compounds that contain

Correct Answer
verified

As part of a lab practical,you need to attach labels about chemical models.For the bond between amino acids,you would add a label describing that it is

Correct Answer
verified

Hydrogen,nitrogen,carbon,and oxygen account for 96% of the human body.These elements are

Correct Answer
verified

Correct Answer
verified

If you were told to sort cards into boxes after a lab on elements,you would put into a slot labelled "Mass Number" any card with text that included the total number of

Correct Answer
verified

Isotopes of the same element are different from one another in that

Correct Answer
verified

If a carbohydrate polymer contains only two monomer units,such as sucrose made from glucose and fructose,it is called a(n)

Correct Answer
verified

Which statement about a bond between sodium and chlorine is incorrect?

Correct Answer
verified

An acid

Correct Answer
verified

Within a single molecule of water,________ bonds form between oxygen and hydrogen.

Correct Answer
verified

A substance with a pH of 7 is

Correct Answer
verified

In a covalent bond

Correct Answer
verified

For most atoms,the outermost electron shell would be full if it contained

Correct Answer
verified

What do a lemon,a toaster oven,and sand grains have in common?

Correct Answer
verified

You encounter a new compound that is bright purple and smells of violets.It sticks to surfaces in a way similar to water and can replace water in the running of living cells.You might expect that this new molecule will make

Correct Answer
verified

Blood is closely maintained at a pH of 7.4.A patient whose blood pH drops below 7.35 is suffering from metabolic acidosis and can go into a coma.What happens to the concentration of H⁺ ions in a patient with a blood pH of 6.4?

Correct Answer
verified

The atomic number of an atom or element is the number of

Correct Answer
verified

Exam 2: The Chemistry of Life

Water is best described as which of the following?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Evaporation is

Correct AnswerverifiedShow Answer

Organic molecules are defined as chemical compounds that contain

Correct AnswerverifiedShow Answer

As part of a lab practical,you need to attach labels about chemical models.For the bond between amino acids,you would add a label describing that it is

Correct AnswerverifiedShow Answer

Hydrogen,nitrogen,carbon,and oxygen account for 96% of the human body.These elements are

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If you were told to sort cards into boxes after a lab on elements,you would put into a slot labelled "Mass Number" any card with text that included the total number of

Correct AnswerverifiedShow Answer

Isotopes of the same element are different from one another in that

Correct AnswerverifiedShow Answer

If a carbohydrate polymer contains only two monomer units,such as sucrose made from glucose and fructose,it is called a(n)

Correct AnswerverifiedShow Answer

Which statement about a bond between sodium and chlorine is incorrect?

Correct AnswerverifiedShow Answer

An acid

Correct AnswerverifiedShow Answer

Within a single molecule of water,________ bonds form between oxygen and hydrogen.

Correct AnswerverifiedShow Answer

A substance with a pH of 7 is

Correct AnswerverifiedShow Answer

In a covalent bond

Correct AnswerverifiedShow Answer

For most atoms,the outermost electron shell would be full if it contained

Correct AnswerverifiedShow Answer

What do a lemon,a toaster oven,and sand grains have in common?

Correct AnswerverifiedShow Answer

You encounter a new compound that is bright purple and smells of violets.It sticks to surfaces in a way similar to water and can replace water in the running of living cells.You might expect that this new molecule will make

Correct AnswerverifiedShow Answer

Blood is closely maintained at a pH of 7.4.A patient whose blood pH drops below 7.35 is suffering from metabolic acidosis and can go into a coma.What happens to the concentration of H⁺ ions in a patient with a blood pH of 6.4?

Correct AnswerverifiedShow Answer

The atomic number of an atom or element is the number of

Correct AnswerverifiedShow Answer

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