How many atoms are in 19.8 grams of neon

A__ is two or more substances that are together in the same place but are not chemically combined

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products