A 0.481g sample of an unknown gas occupies 139mL at 25 C and 1.20 atm. What is the identity of the gas? Write its name AND its chemical symbol.

18. use the activity series to predict whether the following synthesis reaction will occur. write the chemical equations for the reaction if it's predicted to occur. (s) + o2(g) -> *note: it is possible.*

In which of these cases are the two wave points considered to be in phase with each other?

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