If a glass rod rubbed with a silk piece is taken to a ball pen rubbed with wool , the ball pen: a) repels
b) attracts
c) no response
d) at first repels and then attracts​

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)

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

How many miles of water are produced if 5.43 mol pbo2 are consumed