What is a semiconductor?
a. a conductor that operates only at low temperatures.
b. a conductor that conducts electricity faster than common metals.
c. a conductor that has less conductivity than do metallic
conductors
d. a substance that completely blocks the flow of electricity.

Jenny places a strip of ph paper into a solution. when she removes the ph paper, it has turned yellow-green. what should jenny do next to determine the ph of her solution? a. use a different testing method because the ph paper should not change colors b. place the ph paper into a machine that reads the ph of the solution c. compare the ph paper's color with the color of ph paper from another solution d. compare the ph paper's color with a chart of colors and ph ranges