Quiz 2

What is a substance that resists pH changes when added to a solution? A) base B) conjugate C) acid D) buffer E) solute

D

Which property of an atom indicates the number of protons contained in the nucleus? A) Atomic weight B) Mass number C) Atomic mass D) Mass weight E) Atomic number

E

A cation is an atom that has more electrons than protons. A) True B) False

B

An example of a hydrogen bond is the bond between A) Mg+ and Cl- in MgCl2 B) the H of one water molecule and the O of another water molecule C) the two hydrogen atoms in a molecule of hydrogen gas (H2) D) Na+ and Cl- in salt E) C and H in methane ( CH4)

B

In a solution, the two adjacent water molecules are bound to each other by A) ionic bond B) hydrogen bond C) polar covalent bond D) van der waals interactions

B

An element has an atomic number of 20 and an atomic mass of 40. It follows that this atom must have A) 20 protons B) 20 neutrons C) 40 electrons D) A and B only E) A, B, and C

D

Hydrophobic substances such as vegetable oil are A) polar substances that repel water molecules B) polar substances that have an attraction for water molecules C) charged molecules that repel water molecules D) nonpolar substances that repel water molecules E) nonpolar substances that are attracted to water molecules

D

If two atoms were bonded together and they both share similar values for electronegativity, they will form what? A) an ionic bond B) isotopes C) ions D) nonpolar bonds E) polar covalent

D

The difference between covalent bonds and ionic bonds is that between atoms A) Covalent bonds involve the transfer of electrons while ionic bonds involve the sharing of electrons B) Covalent bonds involve the sharing of protons while ionic bonds involve the sharing of the electrons C) Covalent bonds involve the sharing of protons while ionic bonds involve the sharing of neutrons D) Covalent bonds involve the sharing of electrons while ionic bonds include the transfer of electrons E) Covalent bonds involve the sharing of neutrons whiel ionic bonds involve the sharing of electrons

D

Which four elements make up approximately 96% of living matter? A) carbon, oxygen, sulfur, calcium B) carbon, sulfur, phosphorous, hydrogen C) carbon, sodium, chlorine, nitrogen D) carbon, hydrogen, nitrogen, oxygen

D

Which of the following solutions has the greatest concentration of [H+]? A) lemon juice pH 2 B) urine pH 6 C) vinegar pH 3 D) seawater pH 8

D

What is the approximate atomic mass of an atom with 15 neutrons, 15 protons, and 16 electrons? A) 15 daltons B) 31 daltons C) 16 daltons D) 46 daltons E) 30 daltons

E