Do Now: Get binders, lab notebooks
• The volume of a piece of wood is 42.1 mL. Its
length is 14.65 cm and its width is 6.28 cm.
What is its height?
• Convert 9.27 km to nm.
Quizzes and Misc. Notes
• Average (after curve) was a C+.
– We did not meet our class goal 
• AP exams are timed… a lot of you struggled
with this. We will work on quickly getting
through difficult problems!
• Chapter tour – tomorrow. Or Friday? How are
we feeling?
• Please check your assignment schedules!
Next week: what’s happening?
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Monday – Chapter tour and lab report due
Tuesday – SHORT problem set due, review
Wednesday – Unit 1 exam
Thursday – go over Unit 1 exam
Friday – Mini-chapter tour (2.6-2.8) due
How many atoms thick is a piece
of Aluminum Foil?
A Lab Investigation…
The Goal
• Determine the thickness of a piece of
aluminum foil in atoms
Tools
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Al foil – normal and heavy duty
Rulers
Electronic balance
Graduated cylinder
Al cylinder
Anything else you would like to use!
What information might be useful to
solve this puzzle?
• What given info do we need?
• What measurements can we make?
Results
• Carefully and neatly document all of your data
and results
• Record proper number of sig figs with each
measurement – remember: record every digit
you can see PLUS an estimated digit
• Make sure you follow the rules of sig figs in
your calculations. Show all of your work neatly
and clearly!
Write up due Monday
• Abstract: 4 sentence summary of the whole lab
• Methods: Write a detailed procedure to explain
exactly what you did and every measurement you
made and why
• Results: explain all of the calculations you did,
and how you used all of the data to find your
answer
• Discussion: Calculate your percent error
compared to the established value (need to look
this up!) Identify several sources of error in your
group’s process.