In the equation 2 h2 + o2 -> 2h2o, h2, o2, and h2o are all trace elements. only h2o is a compound. only h2 and o2 are compounds. h2, o2, and h2o are all elements. h2, o2, and h2o are all compounds.

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

Balance this equation: n2 + h2 > nh3, write the following molar ratios: n2 / n2 / nh3 h2 /

Why are people not able to scuba dive in the deep part of the ocean