19. The properties of this type of element are: a.
it is a semi-conductor, it is brittle, and it can exist c. it is a semi-conductor, it is shiny, and has a low
in all three states.
melting point
b. it is a bad conductor, it is shiny, and it is a gas. d. it is a bad conductor, has a low melting point, and
can exist in all three states.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

c8h10 is your answerr

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

the correct answer is:

a. formation of precipitation