Errors in experimental technique can result in the percent recovery of copper being too low or too high. Give at least one specific example of each type of error in technique, and explain what could be done to ensure that those errors do not occur in the recovery.

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.