Chemistry Honors – Class 04

Dates

• Period A: Tuesday, January 12th
• Period B: Tuesday, January 12th
• Period F: Wednesday, January 13th

Sig Fig Math

• Review Homework
• Questions? Examples?

Units

• measurements have quantity and units
• measurements incomplete without units
• we treat units with respect

Example

• J = Pa m³
• Pa = N/m²
• N = kg(m/s²)
• using this information express J using only kg, m, s

Dimensional Analysis

• conversions = goal is cancelling units
• ex: m –> km
• more complex examples
• density is an example of unit conversion

Practice

• Ch. 1 (39, 44)

Homework

• Finish Practice Problems