Which of these is a spectator ion in the chemical reaction shown below? 2NaOH(aq) + CuCl₂ →2NaCl(aq) + Cu(OH)₂(s) a. Cu
b. Cl and Na
c. Na
d. OH

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

What can be found in the ionosphere

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?