14) the formula k2s indicates that
a) the potassium ion is twice the size of the sulfide ion
b) sulfur and potassium form a covalent bond
c) there are two potassium ions for each ion of sulfur
d) there are two sulfur ions for each ion of potassium
15) fluorine, f, forms a binary ionic compound with lithium li. what is the name of this compound?
a) fluorine lithide
b) lithium fluoride
c)lithium fluorine
d) fluorine lithium
16) the standard on which the atomic mass unit is based is the mass of a
a) proton
b) neutron
c) chlorine-35 atom
d) carbon-12 atom
17)two highly reactive elements in period 2 are the metal lithium and
a) metalloid arsenic
b) nonmetal selenium
c) nonmetal fluorine
d)nonmetal krypton

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)