Unit 1 - Matter and Energy - Measurements of Matter - Regents

Question 1

Definition of Accuracy

Answer 1

How close the measurement is to the actual value

Question 2

Definition of Precision

Answer 2

How reprodeucible measurements are.
OR
How close repeated measurements are to each other

Question 3

Why are Significant Figures used (3/1)

Answer 3

1. Digits in a number
2. Shows how precise it is
3. Indicate the accuracy of the measurement

Ensures answer is not more precise than original numbers, but is still accurate.

Question 4

How do you round using significant figures? (3)

Answer 4

1. If a decimal is Present (P), count from left after first non- digit is reached
2. If a decimal is Absent (A), count from right after first non- digit is reached
3. ALL NUMBERS AFTER THAT DIGIT IS SIGNIGICANT

Question 5

SIG FIGS

Multiplication & Division
vs. Addition & Subtraction

Answer 5

Multiplication & Division - Round to the least # of SIGFIGS in the original

Addition & Subtraction - Round to the least # of decimal places in the original