1. SIGNIFICANT DIGITS INTRODUCTION
UNIT #1 INTRODUCTION TO CHEMISTRY

2. What are significant digits?
Scientists use significant digits to indicate the accuracy of a measurement

3. Significant Digit Rules
All non-zero digits are significant 13479
Hugged zeros (zeros between other significant digits) are significant 4.002
Leading zeros (zeros in front of non-zero digits) are not significant
Trailing zeros (zeros that are after non-zero digits) are significant only if they are to the right of the decimal point

4. Practice
0.02
0.020
501
501.0
5000
50.000
0.0005
0.1020
10.001

5. Exact numbers
Numbers which have an infinite number of significant digits