Question 1

One dalton is the same as the mass of one _______.

Accepted Answer

The answer of One dalton is the same as the...

Question 2

_______ occurs when one atom, such as 14C, is transformed into another atom, such as 14N, with an accompanying emission of energy.

Accepted Answer

Question 3

Covalent bond formation depends on the ability of atoms to

Accepted Answer

A)   share electrons with other atoms.
B)   donate electrons to other atoms.
C)   receive electrons from other atoms.
D)   Both a and b
E)   All of the above

Question 4

The molecular weight of glucose is 180. If you added 180 grams of glucose to a 0.5 liter of water, what would be the molarity of the resulting solution? (See Figure 2.2 for the periodic table.)

Accepted Answer

A)   18
B)   1
C)   9
D)   2
E)   0.5

Question 5

Which of the following pairs has similar chemical properties?

Accepted Answer

A)   1H and 22Na
B)   12C and 28Si
C)   16O and 8S
D)   12C and 14C
E)   8H and 2He

Question 6

Why does ice float in water?

Accepted Answer

A)   Ice is less dense than water.
B)   There are no hydrogen bonds in ice.
C)   Ice is denser than water.
D)   Water has a higher heat capacity than ice.
E)   Ice has more covalent bonds than water.

Question 7

Which contains more molecules, a mole of hydrogen or a mole of carbon?

Accepted Answer

A)   A mole of carbon
B)   A mole of hydrogen
C)   Both contain the same number of molecules.
D)   Inadequate information is provided.
E)   It depends on atmospheric pressure.

Question 8

Why is the pH of a 0.1 M solution of acetic acid in water higher than that of a 0.1 M solution of HCl in water?

Accepted Answer

A)   HCl is a weaker acid than acetic acid.
B)   The acetic acid does not fully ionize in water, but HCl does.
C)   HCl does not fully ionize in water, but acetic acid does.
D)   Acetic acid is a better buffer than HCl.
E)   Acetate (ionized acetic acid)  is a strong base.

Question 9

A _______ is two or more atoms linked by chemical bonds.

Accepted Answer

The answer of A _______ is two or more atoms...

Question 10

The compounds that sulfur forms with hydrogen are most like the compounds found in which of the following?

Accepted Answer

A)   CH4
B)   NH3
C)   H2O
D)   NaCl
E)   CaCl2

Question 11

If you have 12 moles of a substance, how many molecules do you have of that substance? Suppose the substance has a molecular weight of 342. How many grams of that substance would you have to dissolve in a liter of water to make a 12 M solution?

Accepted Answer

You would multiply Avogadro's number (6....

Question 12

The atomic number of an element

Accepted Answer

A)   equals the number of neutrons in an atom.
B)   equals the number of protons in an atom.
C)   equals the number of protons minus the number of neutrons.
D)   equals the number of neutrons plus the number of protons.
E)   depends on the isotope.

Question 13

How would you make 100 ml of an aqueous solution with a 0.25 M concentration of a compound that has a molecular weight of 200 daltons?

Accepted Answer

A)   Add 0.25 grams of the compound to 100 ml of water.
B)   Add 250 grams of the compound to 100 ml of water.
C)   Take 250 grams of the compound and add water until the volume equals 100 ml.
D)   Take 50 grams of the compound and add water until the volume equals 100 ml.
E)   Take 5 grams of the compound and add water until the volume equals 100 ml.

Question 14

The attraction between a slight positive charge on a hydrogen atom and the slight negative charge of a nearby electronegative atom is a _______.

Accepted Answer

The answer of The attraction between a slight positive charge...

Question 15

Water is a polar molecule. This property contributes to cohesion and surface tension. Draw six water molecules. In your drawing, indicate how hydrogen bonding between molecules contributes to cohesion and surface tension. (Be sure to include appropriate covalent bonds in each molecule.)

Accepted Answer

Three pairs of electrons are shared betw...

Question 16

In addition to covalent and ionic bonds, which of the following interactions are important in biological systems?

Accepted Answer

A)   van der Waals interactions
B)   Hydrogen bonds
C)   Hydrophobic interactions
D)   Both a and b
E)   All of the above

Question 17

An atom with _______ has an atomic mass of 14.

Accepted Answer

A)   14 neutrons
B)   14 electrons
C)   7 neutrons and 7 electrons
D)   7 protons and 7 electrons
E)   6 protons and 8 neutrons

Question 18

Which of the following is the correct order (in decreasing order)  for the relative strengths of chemical bonds?

Accepted Answer

A)   Covalent, ionic, hydrogen, van der Waals forces
B)   Ionic, covalent, hydrogen, van der Waals forces
C)   van der Waals forces, covalent, ionic, hydrogen
D)   Hydrogen, covalent, van der Waals forces, ionic
E)   Ionic, covalent, van der Waals forces, hydrogen

Question 19

The part of the atom that determines how the atom behaves chemically is the

Accepted Answer

A)   proton.
B)   electron.
C)   neutron.
D)   innermost shell.
E)   nucleus.

Question 20

A 1.0 M solution of HCl has a pH of

Accepted Answer

A)   1.0.
B)   7.0.
C)   14.0.
D)   11.2.
E)   14.

Exam 2: Small Molecules and the Chemistry of Life

If you have 12 moles of a substance, how many molecules do you have of that substance? Suppose the substance has a molecular weight of 342. How many grams of that substance would you have to dissolve in a liter of water to make a 12 M solution?

Correct AnswerverifiedYou would multiply Avogadro's number (6....View AnswerShow Answer

A _______ is two or more atoms linked by chemical bonds.

Correct AnswerverifiedShow Answer

The molecular weight of glucose is 180. If you added 180 grams of glucose to a 0.5 liter of water, what would be the molarity of the resulting solution? (See Figure 2.2 for the periodic table.)

Correct AnswerverifiedShow Answer

The compounds that sulfur forms with hydrogen are most like the compounds found in which of the following?

Correct AnswerverifiedShow Answer

A 1.0 M solution of HCl has a pH of

Correct AnswerverifiedShow Answer

Why does ice float in water?

Correct AnswerverifiedShow Answer

The attraction between a slight positive charge on a hydrogen atom and the slight negative charge of a nearby electronegative atom is a _______.

Correct AnswerverifiedShow Answer

One dalton is the same as the mass of one _______.

Correct AnswerverifiedShow Answer

How would you make 100 ml of an aqueous solution with a 0.25 M concentration of a compound that has a molecular weight of 200 daltons?

Correct AnswerverifiedShow Answer

In addition to covalent and ionic bonds, which of the following interactions are important in biological systems?

Correct AnswerverifiedShow Answer

Which of the following pairs has similar chemical properties?

Correct AnswerverifiedShow Answer

Why is the pH of a 0.1 M solution of acetic acid in water higher than that of a 0.1 M solution of HCl in water?

Correct AnswerverifiedShow Answer

Covalent bond formation depends on the ability of atoms to

Correct AnswerverifiedShow Answer

An atom with _______ has an atomic mass of 14.

Correct AnswerverifiedShow Answer

Water is a polar molecule. This property contributes to cohesion and surface tension. Draw six water molecules. In your drawing, indicate how hydrogen bonding between molecules contributes to cohesion and surface tension. (Be sure to include appropriate covalent bonds in each molecule.)

Correct AnswerverifiedThree pairs of electrons are shared betw...View AnswerShow Answer

The part of the atom that determines how the atom behaves chemically is the

Correct AnswerverifiedShow Answer

Which of the following is the correct order (in decreasing order) for the relative strengths of chemical bonds?

Correct AnswerverifiedShow Answer

_______ occurs when one atom, such as 14C, is transformed into another atom, such as 14N, with an accompanying emission of energy.

Correct AnswerverifiedShow Answer

Which contains more molecules, a mole of hydrogen or a mole of carbon?

Correct AnswerverifiedShow Answer

The atomic number of an element

Correct AnswerverifiedShow Answer

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You would multiply Avogadro's number (6....
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Three pairs of electrons are shared betw...
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_______ occurs when one atom, such as ¹⁴C, is transformed into another atom, such as ¹⁴N, with an accompanying emission of energy.

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