Date

- Tuesday, January 30th

Quiz

- recap answer
- sig figs and units process

Counting by Weighing

- determine the mass (30 particles)
- determine the mass per particle
- determine the number of particles in sample by mass
- count the total number of particles

New Idea – The Mole

- words as numbers
- magic translator number
- mass of one mole = periodic table number in grams

How big is a mole?

- If I start with a mole of dollar bills and spend a million dollars every second, how long would it take for the money to run out (years)? Note: this is a dollars-to-years conversion using dimensional analysis (units!)

New Idea – Mole Math

- particles <–> moles
- mass <–> moles
- particles <–> mass

Homework

- Ch. 7 PAIRED (1)

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