Deck 3: Chemistry/biochemistry

Question 1

The physical properties of a substance may be affected by a change in conditions.If this occurs, when the substance returns to its original condition, the physical properties

A)result in the formation of one or more "new" substances.
B)will be the same as the initial properties.
C)will still be different because they cannot have their change reversed.
D)result in a change of physical state.

Answer 1

will be the same as the initial properties.

Question 2

A buffer solution

A)helps maintain pH.
B)is necessary for a neutralization reaction.
C)is necessary for the suspension of colloids.
D)is important in redox reactions.

Answer 2

helps maintain pH.

Question 3

A compound, regardless of its origin or method of preparation, always contains the same elements in the same proportions by weight; this is called

A)the law of constant composition.
B)the law of multiple proportions.
C)a complex ion.
D)a ligand.

Answer 3

the law of constant composition.

Question 4

A colloid is a type of mixture in which

A)the particles are aerosolized.
B)the particles settle and result in a layered mixture.
C)the particles remain suspended in the dispersing medium indefinitely.
D)all of the particles are of equal size and shape.

Question 5

The atomic number of an element is defined as the

A)number of neutrons in an atom.
B)atomic mass of an atom.
C)number of protons in an atom.
D)the number of protons minus the number of neutrons.

Question 6

The Pauli exclusion principle states that

A)no electrons can be in the nucleus.
B)no two electrons can have the same set of quantum numbers.
C)only one electron can occupy the same orbital.
D)no electron can be at a subenergy level.

Question 7

Each family of simple organic compounds is characterized by a functional group that determines

A)the number of covalent bonds necessary for interactions within the family.
B)the number of aromatic rings for each family.
C)their location on the periodic table.
D)the chemical reactions that all members of the family undergo.

Question 8

Avogadro's number is

A)the ratio of the weight of each element in a compound.
B)equal to the atomic mass of an element.
C)the number of atoms or molecules in 1 gaw or gmw.
D)the electron configuration of an element.

Question 9

A solution is a homogeneous mixture

A)of two substances.
B)of particles and a solute.
C)of particles and a solvent.
D)of a substance and a ligand.

Question 10

Atoms that differ only in the number of neutrons present in the nucleus are called

A)isomers.
B)isotones.
C)isotopes.
D)isomorphs.

Question 11

The equation used for calculation of the quantity of an acid or base in a given sample is

A)C₁V₁ = C₂V_2.
B)V₁N₁ = V₂N_2.
C)C₁V₁² = C₂V₂ ².
D)V₁N₁² = V₂N₂².

Question 12

On the periodic table, there is a family of elements that are not very reactive but do form compounds under special conditions.The elements in this family are referred to as

A)noble gases.
B)transition metals.
C)alkaline metals.
D)radioactive.

Question 13

Which type of compound is held together by purely electrostatic forces?

A)Ionic
B)Covalent
C)Constant
D)Cooperative

Question 14

Titrations are procedures in which

A)an accurately measured but unknown volume of solution must be determined.
B)an accurate volume of a known substance must be determined.
C)an accurate volume of a ligand must be determined and measured.
D)an accurate volume is used to determine an unknown redox reaction.

Question 15

A characterization of a weak acid is that it

A)completely dissociates in water.
B)does not completely dissociate in water.
C)needs a buffer water.
D)neutralizes water.

Question 16

Sharing of electrons between two bonded elements forms a(an)

A)ionic bond.
B)covalent bond.
C)coordinate bond.
D)cooperative bond.

Question 17

In the chemical symbol ^ZX_A , the A number is

A)the number of protons and neutrons.
B)the number of protons and electrons.
C)the number of protons minus the number of electrons.
D)the number of neutrons minus the number of protons.

Question 18

The products of a neutralization reaction are

A)an acid and a base.
B)salt and water.
C)a chelate and a ligand.
D)a standard solution.

Question 19

The chemical properties of a substance may be affected by a change in conditions.If this occurs, the change will

A)result in the formation of one or more "new" substances.
B)exhibit the initial properties of the substance.
C)always be irreversible.
D)result in a change of the physical state of the substance.

Question 20

The pH of a solution is determined to be 6.This solution would be considered

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

Question 21

All of the following organic compounds are used in radiopharmaceuticals, EXCEPT

A)arenes.
B)alcohols.
C)phenols.
D)esters.

Question 22

What is the simplest aromatic compound?

A)Benzene
B)Ethene
C)Ethanol
D)Methane

Question 23

Nitrate has a

A)neutral charge.
B)-3 charge.
C)+1 charge.
D)-1 charge.

Question 24

All of the following are types of organic compounds, EXCEPT

A)halides.
B)amines.
C)acids.
D)alkenes.