Which gas in earths atmosphere forms ozone

What type of reaction is zn + cucl2 → cu + zncl2?

Calculate the h3o+ concentration in a solution of acetic acid if the concentration of molecular acetic acid present at equilibrium is 9.97x10^-3 m and k for the dissociation is 1.86x10^-5. ch3cooh(aq)+h2o(> h3o^+(aq)+ch3coo^-(aq)

What’s the scientific notation for the number 6,840,000,000