What will happen when a reactant is added to a system at quilibrium

When a septic tank backs up a goes in to clean it out

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397