1. Chapter 2 Standards
CHEM.A Utilize significant figures to communicate the uncertainty in a quantitative observation.
D Apply scale as a way of relating concepts and ideas to one another by some measure. • Apply dimensional analysis and scale as a ratio. • Convert one scale to another.

2. Section 2.1 Units of Measurement
Chapter 2 Data Analysis
Section 2.1
Units of Measurement

3. Objectives Define SI base units
Explain how adding a prefix changes a unit
Compare derived units for volume and density

4. Metric System Units for scientific measurements
Developed in France in 18th century
Unlike English system

5. SI Units
International agreement
Updated metric system
7 Base Units

6. Base Units

7. Prefixes
Attach to metric unit
You will need to know:
milli
centi
kilo

8. Prefixes

9. Length and Mass Length SI Unit  meter (m) 1 mile = 1.61 km
1 mile = 5280 ft
Mass SI Unit  kilogram (kg)
1 kg = 2.2 lbs

10. Celsius Scale Everyday scale in most countries
Used often in scientific studies

11. Fahrenheit /Celsius

12. Kelvin Scale SI temperature scale
Zero is the lowest obtainable temperature
Absolute Zero

13. Kelvin to Celsius
K = C

14. Derived Units Unit derived from a combination of base units
Ex: Volume and Density

15. Volume
1 milliliter = 1 cubic centimeter
1 mL = 1 cm3

16. Density
Density = Mass/Volume
g/cm3
g/mL

17. Homework
Temp Conversions/ Density Worksheet