What is an endothermic reaction?
a. it is a reaction that keeps heat contained within it.
b. it is a reaction that releases heat to its surroundings.
c. it is a reaction that draws heat from its surroundings.
d. it is a reaction that occurs within a narrow temperature range.

One or more substances changing into one or more substances is an example of a

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false