The purpose of controlling certain values so that the values remain the same is to: a. simplify the experimental analysis. b. simplify the experimental procedure. c. decrease the error of an experiment. d. increase the validity of an experiment

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

What is the number of neutrons in an atom with atomic mass of 35

Which of the following is an example of how telecommunication devices people do their jobs? a.) a security guard checks the time using a digital watch. b.) a banker does some quick math using a solar calculator. c.) a nurse uses a digital thermometer to take a patient’s temperature. d.) a construction worker reports in to his office using a cell phone.