Widespread use of fuel cell vehicles poses a danger because fuel cells emit a greenhouse gas that endangers the ecosystem. it is hard to build fuel cell vehicles that travel slowly enough to match speed limits. hydrogen used to power fuel cells could run out and disappear from earth. it is difficult to safely transport and store hydrogen gas before it is used.

Select the atomic models that belong to the same element

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.