CP03 – Sig Figs

Dates

• Friday, January 13th

Lab Recap A – How many digits?

• Beaker (50-mL)
• Beaker (1000-mL)
• Graduated Cylinder (25-mL)
• Graduated Cylinder (100-mL)
• Graduated Cylinder (1000-mL)
• Flask (250-mL)
• Buret (50-mL)
• Glass Thermometer
• Digital Thermometer
• Top-Loading Balance (400-g)
• Analytical Balance

Uncertainty of Each Device

• Determine the absolute uncertainty in each device
• Determine the relative uncertainty in each device assuming a measurement that is the maximum for the device
• Determine the relative uncertainty in each device assuming a measurement that is half of the maximum for the device
• Patterns?
• How can I use this to determine the best device for the job?

“Trigger Words” in Lab – Why?

• right / wrong
• good / bad
• error
• precise
• accurate

Organizing Information

• Data Tables
• Units
• Goals of Data Presentation

Sig Figs

• How many sig figs in a measurment?
• Examples
• Is there such thing as an “exact” measurment?

Homework

• Review Sci Notation (Ch. 2)
• Ch 2 (5 – 12)
• SPREAD OUT WORK
• Note: even though we didn’t get to this in class the way I wished, go ahead and do your best after reviewing the textbook.