Sig Figs

Question 1

accuracy

Answer 1

the extent to which a measured value agrees with a standard value
-ex: 1.00g is accurate

Question 2

precision

Answer 2

the degree of exactness of a measurement

-ex: 1.101g is precise (exact)

Question 3

exact number

Answer 3

infinitely important, obtained when you count objects or use a defined relationship

   - ex: 2 soccer balls
   - ex: 3 horses

Question 4

measured number

Answer 4

numbers measured with a measuring device

Question 5

how do you take measurements from instruments with graduations?

Answer 5

always take a guess between the two closest markings

Question 6

zeros in between two nonzero digits

Answer 6

always significant

Question 7

zeros to the left of a nonzero digit

Answer 7

never significant

Question 8

zeros to the right of a nonzero digit

Answer 8

only significant if a decimal is present

Question 9

sig figs for multiplication & division

Answer 9

the answer cannot have more sig figs than either of the original numbers

Question 10

sig figs for adding & subtracting

Answer 10

the answer cannot have more digits after the decimal point than either of the original numbers