Signicant Digits and Measurement
What digits are signicant when recording a measurement?
Scienrisrs do .1 lor of. measuring. \When Scientists use an instrument (such as a ruler, graduated cyimder,
spectrophotometer or [ml-since) to measure somethi
9. .a . inm- in.
mm? Practice Problems (continued)
13. Find the empirical formula of a
compound, given that the compound is
found to be 47.9 percent zinc and 52.1
percent chlorine by mass.
Find the empirical formula of a
SCIENTIFIC NOTATION Name
Sciensts very often deal with very smalt and very large numbers. which can lead to a lot of
o contusion when counting zeros! We have learned to express these numbers as powers of 10.
Scientific notation takes the form of M x 10 wh
SICK FIGS PRACTICE
' . . . v . - . : Measurement
L Seientmc 3 Number 0! Sick .[ ., -. i 7.
Measurement 7 . J . : Rounded m 1. 51C; 1,
Notation 1 Figs . _ g
! g 5 F10:- -
d $0.035 kg I N A
. e T0246 L ! " ' : T5.
LABORATORY ACTIVITY ,nk 0h
use OF THE METRIC SYSTEM sr FOR ME .
Q! d t l ASUREMENT ho (Mimi/f 3/ amt/bouts
of 6 many our 71 or (Jedi/9
You are accustomed to using such units as feet. pounds, and quarts for measurement. These are part of