Which two reactions are faster than the others? Silver tarnishes in air that contains hydrogen sulfide.
Iron metal reacts with oxygen in air to form rust.
Lead nitrate and potassium iodide react to form a yellow precipitate.
Lead nitrate and potassium iodide react to form a yellow precipitate.

In order to calculate the amount of heat transferred you must know the __ and specific heat of the material, as well as the change in temperature. a. volume b. density c. mass d. enthalpy

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.

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?