Question

PLEASE HELP - MEDAL AND FAN:
Hey guys, sorry I know this isn't exactly math, but there was nobody in chemistry. I have a few questions on significant figures and I was wondering if you could check my answers?

Answer 1

@ganeshie8
@Nnesha

Answer 2

The first one is
6.07 * 10^-15
How many sig figs?
I put 3, is that correct?

Answer 3

yes

Answer 4

ok 0.003840
How man sigfigs? 4?

Answer 5

yes

Answer 6

17.00
4 sig figs?

Answer 7

yes

Answer 8

8 * 10^8
I think this one is 1 sig fig?

Answer 9

yup

Answer 10

lol ok -
463.8052
7 sig figs

Answer 11

yes

Answer 12

300 has 1
301 has 3
and 300. has 3
?

Answer 13

yes to all

Answer 14

Awesome, so
100 has 1
and 1.0 * 10^2 has 1 as well right?

Answer 15

almost

1.0 * 10^2 has 2, since we count the 0 after a decimal point

Answer 16

oh ok -
so would 1.00 * 10^3 be 3?

Answer 17

yes

Answer 18

100.
3 s.f.?

Answer 19

yup

Answer 20

0.0048 has 2?
0.00480 has 3?
4.80 * 10^-3 has 3?
4.800 * 10^-3 has 4?

Answer 21

yes to all

Answer 22

ok what about rounding to sig figs?
0.00034159 to three digits? how do i do that

Answer 23

well,

0.00034159 has 5 sig figs, so we look at the third digit from the right (1). then we look at 5 (the next digit) to see whether to keep 1 or round to 2. since it's 5 we round 1 to 2 like so:

0.00342

Answer 24

ok but what happened to the third zero?

Answer 25

oh whoops

0.000342

Answer 26

haha ok thats what i thought
the next one is
103.351 * 10^2 to 4 digits.
103.4?

Answer 27

yup, but don't forget the 10^2

Answer 28

ok so i keep that. Next one is:
17.9915 to 5 digits
17.992

Answer 29

yup

Answer 30

ok and the last one:
3.365 * 10^5 to 3 digits
3.37 * 10^5 ?

Answer 31

yes

Answer 32

btw you are awesome, my teach gave homework without teaching (which is ok except for the fact that I don't have my textbook yet lol)