Which of the following would best describe the characteristics of covalent materials? select one:
a. a. a brittle, transparent solid with a very high melting point.
b. b. a shiny, malleable solid with a very high melting point.
c. c. a non-conducting material with low melting and boiling points, likely liquid or gas at room temperature.
d. d. a brittle, opaque solid with a very high melting point.
e. e. a non-conducting solid at room temperature that will conduct if melted or dissolved.

C. c. A non-conducting material with low melting and boiling points, likely liquid or gas at room temperature.

Explanation:

Nevertheless it the best description of covalent bond based compounds they are not all likely to be liquid or gas. But many of them are.

(example water, chlorine, sugar, ethanol)

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.