Question

Iodine-131 has a half-life of 8.10 days. In how many days will 50 grams of Iodine-131 decay to one-eighth of its original amount?

24.3 days

32.4 days

40.5 days

48.6 days

Answer 1

please help me :)

Answer 2

one second I am calculating haha
just cut it in half everytime, but if you don't know how to do it then I will still help

Answer 3

It is 24.3 hon

Answer 4

hope that helped

Answer 5

thank you! you are so nice, can u help me with some more?

Answer 6

I can try shoot some more and right now I am in a Biology B final exam so I might be slow cause I am having a hard time too

Answer 7

i see people say B, what does that stand for?

Answer 8

Which of these conclusions is most likely correct about the location from where the fossil was discovered?

It was a sea which was replaced by a forest.

It was a forest which was replaced by a sea.

It has many marine animals which feed on plants.

It has many marine animals which share a common ancestor.

Answer 9

here is the link

Answer 10

http://puu.sh/34huY.jpg

Answer 11

B is because of the way K12 online school works, Biology A is the First Semester and B is the second

Answer 12

oh okay, do u think u know the answer to the question above :)

Answer 13

I believe it is A because it was obviously a fossil from the sea that has to now be covered in land in order to be preserved like that

Answer 14

So are you in Biology and I take it you are in the same Biology as me cause I learned all this, this year

Answer 15

thanks, can u help me with 1 last 1 ? i am rlly bad at the half life things

Answer 16

I meant Biology 1 haha

Answer 17

yeah hit me

Answer 18

actually i am in BVS which is the same thing as FLVS

Answer 19

I have no clue what that means haha, but what's the question dear

Answer 20

he table below compares the radioactive decay rates of two materials.



Based on the table, which of these conclusions is most likely correct?
The half-life of Material 1 and Material 2 are equal.

The half-life of Material 2 is double the half-life of Material 1.

The half-life of Material 2 is 10.8 seconds more than the half-life of Material 1.

The half-life of Material 1 is 10.8 seconds more than the half-life of Material 2.

Answer 21

http://puu.sh/34hCt.png

Answer 22

if you have trouble copying and pasting just copy it and then do Ctrl+V

Answer 23

ok one sec

Answer 24

yikes thats a hard one, just a minute

Answer 25

lol thts wut i do, i was just making sure i had the right question

Answer 26

i am bad at these :(

Answer 27

haha oh ok XD

Answer 28

okay nevermind that was easy XD... It's B The half-life of Material 2 is double the half-life of Material 1.

Answer 29

I am good at math too so that may be why it helped

Answer 30

Thanks so much for all your help! by any chance would u like to help me a little more?

Answer 31

hahaha your welcome and it depends I may or may not know the answer and are you taking the test right now or can it wait? cause idk if you remember, but I am in a Final Exam and I could get kicked out at anytime since it is past twelve :(
and I have to try to do more assignments and today is supposed to be my deadline :(

Answer 32

Yeah, sadly i am in my final 2 :( it is 3:16 a.m.! I am soo tired but i want to get school done for the year! i dont want you to get timed out gl on ur exam and thanks for all the help! I am going to ask some1 else in a new thread :D:D

Answer 33

your welcome and ask any way I think I'll be fine

Answer 34

you may not get anything from anyone for a long time and hey do you have a gmail