Chemistry Final ACS Exam Questions and
Correct Answers/ Latest Update / Already
Graded
Accuracy?
Ans: Closeness of measurements to the TRUE VALUE of what is
being measured
Precision?
Ans: Closeness of a SET of measurements
How do you calculate Percent Error?
Ans: I experimental-accepted I
____________________ x 100
accepted value
Are zeros infront of non-zero digis significant?
Ans: Nope!
ex: 0.0071 is only 2 sig figs
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Are zeros at the end of a number and to the right of the decimal
significant?
Ans: Yep!
ex: 9.100 is 4 sig figs
Addition/Subtraction in regards to sig figs?
Ans: Round numbers to the least number of decimal places
Multiplaction/Division in regards to sig figs?
Ans: Round answers to the least amount of sig figs
# of e- equal
Ans: the # of p+
Atomic Mass?
Ans: Number of protons in the nucleus (number on the left
bottom corner of the chemical symbol)
Atomic Mass Number?
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