Date

- Tuesday, January 31st

Class Business

- Video due date
- Sharing density data (see post for info)
- Turn in worksheet HW

Recap

- Review homework questions
- How do I show process?
- Do I need to write units all the time?
- Sig figs and math rules?

Quiz – Measurement, Sig Figs and Units

- two questions
- 15 minutes
- show your work

Lab Activity – Pennium

- weighted average calculation
- simulate this with pennies
- each group has a sample of 15 pennies
- determine how many isotopes
- determine the mass of each isotope
- calculate the weighted average of each sample
- share on the spreadsheet [LINK]

Lab Activity Discussion

- How does this relate to the periodic table?

Homework

- Finish lab data entry
- Ch. 5 (22, 24)

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