iron Presence of trace elements, irradiation and iron impurities give the gem amethyst its purplish color!
Answer:
chemical change
Explanation:
chemical change requires energy in the form of heat or electricity.
Hydroxyl ions are OH⁻ while hydronium ions are H₃O⁺ which is essentially H⁺ ions. The formula for pH is: pH = -log[H⁺]. So, the greater the concentration of H⁺ is, the lower the pH which indicates acidity. On the other hand, the greater the concentration of OH⁻, the greater the pH which indicates basicity. This is also a consequence of the equation: pH + pOH = 14.
El arroz si produce electricidad:)