Chemistry Final ACS Exam with Answers

Chemistry Final ACS Exam with Answers
Question 1
Accuracy?

Correct Answer
Closeness of measurements to the TRUE VALUE of what is being measured



Question 2
Precision?
Correct Answer
Closeness of a SET of measurements



Question 3
How do you calculate Percent Error?
Correct Answer
I experimental-accepted I
____________________ x 100
accepted value




Page 1 of 20

,Question 4
Are zeros infront of non-zero digis significant?
Correct Answer
Nope!
ex: 0.0071 is only 2 sig figs



Question 5
Are zeros at the end of a number and to the right of the decimal significant?
Correct Answer
Yep!
ex: 9.100 is 4 sig figs



Question 6
Addition/Subtraction in regards to sig figs?
Correct Answer
Round numbers to the least number of decimal places



Question 7
Multiplaction/Division in regards to sig figs?
Correct Answer
Round answers to the least amount of sig figs




Page 2 of 20

, Question 8
# of e- equal
Correct Answer
the # of p+



Question 9
Atomic Mass?
Correct Answer
Number of protons in the nucleus (number on the left bottom corner of the chemical symbol)



Question 10
Atomic Mass Number?
Correct Answer
Number of protons and neutrons (number on the left upper corner of the chemical symbol)



Question 11
Isotope?
Correct Answer
Atoms of the same element, but with different masses (different number of neutrons)




Page 3 of 20