What do moles measure? What is the value of a mole? Write your number using scientific notation

Explanation:

A mole is a convenient unit of quantity of particles. It can be likened to a dozen, a gross or a score. Each of the unit is a specific number of substances

The particles are atoms, molecules, formula units, ions, electrons, protons, neutrons and so forth.

 The value of this quantity is 6.02 x 10²³ particles

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.