Question 1

Some insects can stride on the surface of water because water

Accepted Answer

A)   has a high specific heat.
B)   has lower density when frozen.
C)   is a good solvent.
D)   has surface tension.
E)   resists temperature changes.F) None of the above
G) B) and E)

Question 2

Which of the following property of water helps an individual who is exercising vigorously maintain a constant body temperature?

Accepted Answer

A)   Water has high heat capacity.
B)   Water is less dense than ice.
C)   Water is a good solvent.
D)   Water molecules are cohesive.
E)   Water moleculesare adhesive.F) C) and D)
G) None of the above

Question 3

An atom with a neutral charge has

Accepted Answer

A)   equal numbers of neutrons and electrons.
B)   more neutrons making it more neutral.
C)   the same number of protons and neutrons.
D)   equal numbers of protons and electrons.
E)   more protons than it does electrons.F) A) and E)
G) A) and D)

Question 4

Cells need buffering agents in order to

Accepted Answer

A)   speed up chemical reactions.
B)   carry out life functions in extremely acidic conditions.
C)   minimize the changes in pH of their internal environment.
D)   help transfer electrons from one atom to another.
E)   increase the amount of OH - in their surroundings.F) None of the above
G) C) and D)

Question 5

An ionic bond forms when

Accepted Answer

A)   an atom gives away or takes in an electron.
B)   an atom gives away or takes in a proton.
C)   a negatively charged ion is attracted to one with a positive charge.
D)   two atoms come close enough to share one or more electrons.
E)   two atoms come close enough to share one or more protons.F) A) and B)
G) C) and D)

Question 6

Heartburn occurs when stomach acid escapes the stomach and burns the tissues of the esophagus. Baking soda is sometimes used as an antacid. How does baking soda help relieve symptoms of heartburn?

Accepted Answer

A)   The baking soda is serving as a buffer to take up excess H + ions from stomach acid.
B)   The baking soda is able to coat the lining of the esophagus thereby protecting it from the acid.
C)   The baking soda increases the acidity of the stomach.
D)   The baking soda releases salt which draws more water into the esophagus thereby diluting the acid.
E)   The baking soda relaxes the stomach muscles.F) A) and E)
G) C) and E)

Question 7

Isotopes of an element differ in their

Accepted Answer

A)   proton number.
B)   electron number.
C)   neutron number.
D)   type of bonds.
E)   atomic number.F) B) and C)
G) A) and B)

Question 8

In the reaction 6CO 2 + 6H 2O → C 6H 12O 6 + 6O 2 carbon dioxide is one of the

Accepted Answer

A)   reactants.
B)   products.
C)   enzymes.
D)   elements.
E)   ions.F) None of the above
G) D) and E)

Question 9

When water boils

Accepted Answer

A)   hydrogen bonds are broken between neighboring water molecules.
B)   covalent bonds are broken between oxygen and hydrogen atoms.
C)   ionic bonds are broken when the minerals in water are heated.
D)   the bond between one water molecule and another becomes stronger.
E)   the hydrogen atoms break away from the oxygen and escape as vapor.F) B) and D)
G) B) and C)

Question 10

A water molecule, as shown here, is polar because of

Accepted Answer

A)   the transfer of electrons.
B)   unequal sharing of electrons.
C)   its ability to freeze.
D)   its hydrogen bonds.
E)   the negative charge of the molecule.F) None of the above
G) A) and D)

Question 11

Which of the following is a way that isotopes are useful in medicine? Check all that apply.

Accepted Answer

A)   Radioactive isotopescan be used as tracers to detect molecular changes or to destroy abnormal or infectious cells.
B)   Radioactive isotopes can be used to regenerate damaged tissues.
C)   Radioactive isotopes can be used to detect Alzheimer's disease.
D)   Radioactive isotopes can be used to sterilize medical equipment.
E)   Radioactive isotopes can be used to protect against dangerous biological agents.F) A) and E)
G) A) and C)

Question 12

Cola has a pH of 3.5. This means that it has an excess of _______ ions and would be called a(n)  ________.

Accepted Answer

A)   H +; acid
B)   OH -; acid
C)   H +; base
D)   OH -; base
E)   H +; neutral solutionF) A) and B)
G) None of the above

Question 13

Sulfur has an atomic number of 16. How many valence shell electrons does it have?

Accepted Answer

A)   One
B)   Two
C)   Three
D)   Four
E)   SixF) B) and D)
G) None of the above

Question 14

Which of the following statements about basic solutions is true?

Accepted Answer

A)   Basic solutions have high concentrations of H +.
B)   Basic solutions have a pH under 7.
C)   Basic solutions release OH -.
D)   Basic solutions release both H+ and OH -.
E)   Basic solutions have a neutral pH.F) A) and B)
G) A) and C)

Question 15

Which of the following is a molecule?

Accepted Answer

A)   H 2O
B)   O­ 2­
C)   NaCl
D)   CO 2
E)   MgCl 2F) A) and D)
G) A) and B)

Exam 2: The Chemical Basis of Life

In the reaction 6CO ₂ + 6H ₂O → C ₆H ₁₂O ₆ + 6O ₂ carbon dioxide is one of the

Correct Answer
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When water boils

Correct Answer
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Which of the following is a way that isotopes are useful in medicine? Check all that apply.

Correct Answer
verified

Isotopes of an element differ in their

Correct Answer
verified

Sulfur has an atomic number of 16. How many valence shell electrons does it have?

Correct Answer
verified

Which of the following property of water helps an individual who is exercising vigorously maintain a constant body temperature?

Correct Answer
verified

Cola has a pH of 3.5. This means that it has an excess of _ ions and would be called a(n) __.

Correct Answer
verified

Which of the following statements about basic solutions is true?

Correct Answer
verified

Some insects can stride on the surface of water because water

Correct Answer
verified

An ionic bond forms when

Correct Answer
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Which of the following is a molecule?

Correct Answer
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An atom with a neutral charge has

Correct Answer
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Cells need buffering agents in order to

Correct Answer
verified

A water molecule, as shown here, is polar because of

Correct Answer
verified

Heartburn occurs when stomach acid escapes the stomach and burns the tissues of the esophagus. Baking soda is sometimes used as an antacid. How does baking soda help relieve symptoms of heartburn?

Correct Answer
verified

Exam 2: The Chemical Basis of Life

In the reaction 6CO 2 + 6H 2O → C 6H 12O 6 + 6O 2 carbon dioxide is one of the

Correct AnswerverifiedShow Answer

When water boils

Correct AnswerverifiedShow Answer

Which of the following is a way that isotopes are useful in medicine? Check all that apply.

Correct AnswerverifiedShow Answer

Isotopes of an element differ in their

Correct AnswerverifiedShow Answer

Sulfur has an atomic number of 16. How many valence shell electrons does it have?

Correct AnswerverifiedShow Answer

Which of the following property of water helps an individual who is exercising vigorously maintain a constant body temperature?

Correct AnswerverifiedShow Answer

Cola has a pH of 3.5. This means that it has an excess of _______ ions and would be called a(n) ________.

Correct AnswerverifiedShow Answer

Which of the following statements about basic solutions is true?

Correct AnswerverifiedShow Answer

Some insects can stride on the surface of water because water

Correct AnswerverifiedShow Answer

An ionic bond forms when

Correct AnswerverifiedShow Answer

Which of the following is a molecule?

Correct AnswerverifiedShow Answer

An atom with a neutral charge has

Correct AnswerverifiedShow Answer

Cells need buffering agents in order to

Correct AnswerverifiedShow Answer

A water molecule, as shown here, is polar because of

Correct AnswerverifiedShow Answer

Heartburn occurs when stomach acid escapes the stomach and burns the tissues of the esophagus. Baking soda is sometimes used as an antacid. How does baking soda help relieve symptoms of heartburn?

Correct AnswerverifiedShow Answer

In the reaction 6CO ₂ + 6H ₂O → C ₆H ₁₂O ₆ + 6O ₂ carbon dioxide is one of the

Correct Answer
verified

Correct Answer
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Cola has a pH of 3.5. This means that it has an excess of _ ions and would be called a(n) __.

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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