Which of the following is a radioisotope used to date rock formations older than 50,000 years?
a. carbon-14.
b. uranium-235.
c. cobalt-69.
d. carbon-12.

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

Temperature is _related to the average kinetic energy of a gas. inversely directly not disproportionally

Acetylene gas c2h2 undergoes combustion to produce carbon dioxide and water vapor how many grams of water are produced by the same amount of c2h2?