Question 57

the sharing or transferring of outer valence electrons between atoms results in a chemical bond.

true

false
2 points save answer

question 58

the bond exhibited between two nitrogen atoms is an example of a covalent bond.

true

false
2 points save answer

question 59

the bond exhibited between lithium and fluorine is an example of an ionic bond.

true

false
2 points save answer

question 60

which of the following pairs of atoms exhibit an ionic bond?

h and s

fe and o

c and f

c and n
3 points save answer

question 61

which of the following pairs of atoms do not exhibit a covalent bond?

o and s

c and h

sr and f

f and h
3 points save answer

question 62

non-metal atoms can form:

ionic bonds

covalent bonds

both ionic and covalent bonds

neither ionic nor covalent bonds
3 points

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.