Covalent Bonds Quiz
Which diagram represents an element that is likely to form covalent bonds?
# 2
The compound ethylene (C2H4) is represented by this diagram. What statement best describes the arrangement of the atoms in an ethylene molecule?
Two electrons are shared between each hydrogen atom and the carbon atom bonded to it, and four electrons are shared between the carbon atoms.
Which best describes most covalent compounds?
brittle
Phosphorous (P) and chlorine (Cl) bond covalently to form the important industrial compound phosphorous trichloride. The diagrams below show the electron structures of phosphorous and chlorine. Which diagram shows how the covalent bonds most likely form in a phosphorous trichloride molecule?
# 3
What best explains how two oxygen atoms, each with six valence electrons, can bond with each other?
Each atom can share two electrons with the other so that each atom has eight valence electrons.
For a science fair project about food and chemistry, Bill looks around his kitchen for examples of covalent compounds. What evidence can Bill use in his project to show that water (H2O) acts like other covalent compounds?
He can demonstrate that water can be boiled on a simple kitchen stove.
After a covalent bond has stabilized an atom, the atom will have
a full valence electron shell.
A candle's wick is the fabric string that holds the flame, and it burns down at a constant slow pace when the candle is lit. The wick is usually surrounded by wax. Which is the most important property of covalent compounds that makes them useful for making candle wax?
a low melting point
In carbon dioxide (CO2), there are two oxygen atoms for each carbon atom. Each oxygen atom forms a double bond with carbon, so the molecule contains two sets of double bonds. Two sets of double bonds means that the total number of electrons being shared in the molecule is
eight
The compound cyanogen (CN)2 has covalent bonds shown in this diagram. How many electrons are shared between one nitrogen atom and one carbon atom?
six
