1) which substance could be a metal? 2) state all substances that are liquid at room temperature 3) which substance could be propane? 4) which substance could be sodium chloride?

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

Which of the following units is not an official si unit