Quiz #2

in salt, what is the nature of the bond between sodium and chlorine? a) ionic b) nonpolar covalent c) hydrogen d) hydrophobic e) polar covalent

a) ionic

which of these refer to atoms with the same atomic number but different atomic masses? a) these atoms are isotopes b) these atoms have different number of electrons c) these atoms have different number of protons d) these atoms are different elements e) these atoms are isomers

a) these atoms are isotopes

which of the following statements is true about buffer solutions? a) they maintain a relatively constant pH when either acids or bases are added to them b) they maintain a constant pH when acids are added to them but not when bases are added to them c) they maintain a relatively constant pH of approximately 7 when either acids or bases are added to them d) they are found only in living systems and biological fluids e) they maintain a constant pH when bases are added to them but not when acids are added to them

a) they maintain a relatively constant pH when either acids or bases are added to them

if you want a molecule that is highly polar, look for one that contains a) O-N b) H-N c) C-S d) C-H e) S-H

b) H-N

which answer correctly ranks the atoms in terms of highest to lowest electronegativity? a) C,H,O,N b) O,N,C,H c) N,O,H,C d) O,N,H,C e) N,O,C,H

b) O,N,C,H

an ions bond involves ___. a) no atoms other than sodium and chlorine b) an attraction between ions of opposite charge c) the unequal sharing of an electron pair d) water avoidance e) the sharing of a single pair of electrons

b) an attraction between ions of opposite charge

the chemical behavior of an atom depends primarily upon which of the following? a) total number of electrons contained by the atom b) number of electrons in the valence shell c) number of neutrons in the nucleus d) number of electron shells contained by the atom e) number or protons in the nucleus

b) number of electrons in valence shell

pick out the most polar bond in the list a) N-H b) O-C c) O-H d) C-H e) O-N

c) O-H

atoms with the same number of protons but different electron charges____. a) have different atomic masses b) have different numbers of neturons c) are different ions d) have different atomic numbers e) are different isotopes

c) are different ions

water molecules are able to form hydrogen bonds with ____. a) methane gas (CH4) molecules b) compounds that are not soluble in water c) compounds that have polar covalent bonds d) compound that have nonpolar covalent bonds e) oxygen gas (O2) molecules

c) compounds that have polar covalent bonds

a(n) ___ refers to two or more atoms held together by covalent bonds a) ion b) shell c) molecule d) isotope e) community

c) molecule

a water molecule can bond to up to ___ other water molecules by ___ bond. a) three...ionic b) four...polar covalent c) two...polar covalent d) four...hydrogen e) two...hydrogen

d) four...hydrogen

fluorine's atomic number is 9 and its atomic mass is 19. how many neutrons does fluorine have? a) 9 b) 28 c) 19 d) 81 e) 10

e) 10

an uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. how many protons does boron have? a) 16 b) 0 c) 6 d) 11 e) 5

e) 5

what is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons a) -1 b) 12 c) 0 d) 18 e) 6

e) 6

the tendency of an atom to pull electrons towards itself is referred to as its___. a) tonicity b) polarity c) covalency d) ionic potential e) electronegativity

e) electronegativity

the unequal sharing of elections within a water molecule makes the water molecule ____. a) change easily from a liquid to gaseous form b) hydrophobic c) ionic d) have a low surface tension e) polar

e) polar