Question

i know this math but do anybody know anything about significant figures(chemistry)

Answer 1

yea.. posts ur question! :)

Answer 2

the number of significant figures in 640cm

Answer 3

3

Answer 4

somebody told me 2

Answer 5

It's two.

Answer 6

640. would have three

Answer 7

how? or why? / if the zero was on the left that it wont count but the zero is on the right so its 3 i guess..

Answer 8

so 200.0mL is 4 significant figures??

Answer 9

yes

Answer 10

0.5200g has uuummmmmm i think 2?

Answer 11

no the zeros on the right u count them ! so its 4

Answer 12

okay... 1.005kg is 4?

Answer 13

yes

Answer 14

10 000L is 1?

Answer 15

no ,

Answer 16

what is it den??

Answer 17

5

Answer 18

how it got 0s behind the 1.

Answer 19

no these zeros are on the right but if it was like 00001 this will be 1

Answer 20

aaww ok

Answer 21

20.900cm is 5?

Answer 22

yes

Answer 23

0.000 000 56g/L 8?

Answer 24

yes!! :D

Answer 25

im gettn it yay...

Answer 26

heehe oh yea u aarreee!!!! :D

Answer 27

0.040kg/m is 3?

Answer 28

yup! :)

Answer 29

790 001cm is6?

Answer 30

yes!

Answer 31

665.000 kg is 6?

Answer 32

yep!

Answer 33

yay thanks

Answer 34

hehee no problem!! :D :D

Answer 35

Actually, .040 is not 3 sig figs, it is 2 significant digits. The 0 in front of 0 is a place holder, tells you which decimal place the number 4is at. The number in proper scientific notation is 4.0 x 10-2. ALso .00000056 is 2 significant figures for the same reason. the number is 5.6x10-7. So two sig figs in the actual number. Something like 640 or 15,000 is sort of ambiguous. Best to assume it has less sig figs than more. So best guess is 2 for 15,000. Unless you know that it is 1.5000 x 10^4.

Answer 36

oh yea ur right!! (soorrryyyy)

Answer 37

Thanks daymond, You should read about it some more. http://www.usca.edu/chemistry/genchem/sigfig.htm or http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch1/sigfigs.html
Be happy to help. There are always problems on Sig figs in any college intro chem exam.

Answer 38

thanks