Chemistry Final ACS Exam questions with correct answers

Accuracy? - Answer Closeness of measurements to the TRUE VALUE of what is being measured Precision? - Answer Closeness of a SET of measurements How do you calculate Percent Error? - Answer I experimental-accepted I ____________________ x 100 accepted value Are zeros infront of non-zero digis significant? - Answer Nope! ex: 0.0071 is only 2 sig figs Are zeros at the end of a number and to the right of the decimal significant? - Answer Yep! ex: 9.100 is 4 sig figs Addition/Subtraction in regards to sig figs? - Answer Round numbers to the least number of decimal places Multiplaction/Division in regards to sig figs? - Answer Round answers to the least amount of sig figs # of e- equal - Answer the # of p+