Homework Help: Chemisty (Sig Figs)

Posted by Hannah on Monday, August 23, 2010 at 4:34pm.

Each of the following numbers was supposed to be rounded to two significant figures. For each one below, decide whether it was correctly rounded or not, and for those that were incorrectly rounded, correct them.

(a) 3.149 e3 to 3.2 e3
Its incorrect but I dont know the correct answer

(b) 7.999 102 to 80
same with this one

50.31 to 50.3
same with this one and I put 50.0 and it said check the number of sig figs

(d) 0.009914 to 0.010
this is incorrect but i dont know the correct one.

thanks:)
im not that good at sig figs:(

Chemisty (Sig Figs) - bobpursley, Monday, August 23, 2010 at 5:08pm
The issue you seem to have is not significant figures, but rounding rules.

You can fine rounding rules and examples on a Google search.

a) 3.149e9 rounds (to two sig figures) to 3.1e9

b) 7.999 102 to 80 rounds to 8.0e2
c) 50.31 to 50 or better 5.0e1. When one writes 50, it is difficult to know if the zero is significant, in general it is not. But with 5.0e1, the zero is certain.
d) 0.009914 to 0.0099 is two significant figures.

Answer this Question

Related Questions

Chemistry-sig figs - Each of the following numbers was supposed to be rounded to...
Physics Sig Figs - When you are multiplying two numbers, how do you determine ...
Science (Chemistry!) - I just do not understand ANYTHING about multiplying/...
SIG FIGS - How many significant figures does 22.0, 0.22, 22. , 0.022? Im just ...
algebra - SEE BELOW PLEASE at******** If computing N(t) = Pa^t where P=642....
algebra - SEE BELOW PLEASE at******** If computing N(t) = Pa^t where P=642....
math - See below PLEASE at ******** If computing N(t) = Pa^t where P=642.035376 ...
Chemisty (Sig Figs) - so i am terrible at this. Round each number to 3 ...
sig figs - each of the following were suppose to be rounded to two sig figs. ...
Chemisty (Sig Figs) - 1.20 Mm to kilometers its 1200 but when I put it in it ...

For Further Reading

First Name:
School Subject:
Answer: