What is the average speed of a skateboarder who travels 20 km in 2 hours

In an oxidation-reduction reaction, oxidation is what happens when a reactant

What is the value of the standard enthalpy of formation of an element in its most stable form?

Which of your 24 wells had indications that a chemical reaction occurred? how were you able to tell that a chemical reaction occurred? which of your 24 wells had indications that a physical reaction occurred? how were you able to tell that a physical reaction occurred? report on both mixing and evaporation. make a general statement about whether your hypotheses were validated or rejected. must your hypotheses be correct for this to be a successful laboratory?