An exothermic reaction is a chemical reaction that produces a. bubbles of gas b. a new substance c. a precipitate d. heat energy

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume