The State of Matter Characterized by Atomic Nuclei and Free

Q162: The major component of natural gas is<br>A)ethane.<br>B)methane.<br>C)butane.<br>D)octane.

Q163: When coal burns,<br>A)chemical energy is converted to

Q164: The internal heat from the earth is

Q165: The lowest grade of coal is<br>A)anthracite.<br>B)bituminous.<br>C)lignite.<br>D)peat.

Q166: Approximately what percentage of the chemical energy

Q168: Wood,crop residues,and _ still remain the main

Q169: If very pure silicon is doped with

Q170: Which of the following is NOT a

Q171: Most solar cells are composed primarily of<br>A)arsenic.<br>B)sulfur.<br>C)nickel.<br>D)silicon.

Q172: The fastest growing energy source in the