1. AP Chemistry
Day 2 – Review Density of Liquids lab, Finish Chapter 1 Notes, Prepare for Quiz 1,

2. Warm Up – Find the Density
Your company are given the task to find the density of a mystery liquid that has been oozing out of the ground near your house. The mystery liquid is thick, green, and pours slowly.
You receive 3 different vessels: a graduated cylinder, a beaker, flask and a scale that measures to g
You must choose the vessel that will be the most precise and propose a procedure that will be used to find the density and eventually identity. Try to be clear and concise with your procedure (limit of 11 steps).
With your lab partner:
Choose the most precise vessel
Look over what you did last class
Write a detailed procedure with no more than 11 steps (on butcher paper with marker from bin)
TIME: 12 MINUTES
WHEN DONE: Give your company a name

3. AP Chemistry Agenda
Discuss Mini-Lab - Measuring Density of Liquids
Finish Up Chapter 1 Notes
Reading/Problem Set Schedule
Correct Homework Packet
Prepare for Chapter 1 Quiz
Next Class:
Pass Out Lab Notebooks
1st Major Lab: Check out lab equipment
Remember: Safety Contract DUE Last class (if you have it now, turn it into class box by end of class) and if you have a “0” in Synergy, this means that you have NOT turned it in.

4. Chapter 1 Book Notes How do I classify states of matter? EQ:
How do I use measurement in chemistry?
EQ:
1.5 Uncertainty in Measurement
Precision
Accuracy
Significant Figures
Ended here 9/8/16

5. Uncertainty in Measurements
Different measuring devices have different uses and different degrees of accuracy
All measured numbers have some degree of inaccuracy

6. Accuracy versus Precision
Accuracy refers to the proximity of a measurement to the true value of a quantity.
Precision refers to the proximity of several measurements to each other.

7. Check for Understanding
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Check for Understanding
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8. In three trials, a student measures a sample’s mass to be to be 0
In three trials, a student measures a sample’s mass to be to be g, g, and g. The accepted value is g. The student’s data have
good accuracy and good precision.
good accuracy, but poor precision.
poor accuracy, but good precision.
poor accuracy and poor precision.
Answer: b

9. Significant Figures
The term significant figures refers to digits that were measured.
When rounding calculated numbers, we pay attention to significant figures so we do not overstate the accuracy of our answers.

10. Significant Figures All nonzero digits are significant.
Zeroes between two significant figures are themselves significant.
Zeroes at the beginning of a number are never significant.
Zeroes at the end of a number are significant if a decimal point is written in the number.

11. Significant Figures
When addition or subtraction is performed, answers are rounded to the least significant decimal place.
When multiplication or division is performed, answers are rounded to the number of digits that corresponds to the least number of significant figures in any of the numbers used in the calculation.

12. Check for Understanding
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Check for Understanding
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13. The measured quantity 0.0860 g contains _____ significant figures.
three
four
five
six
Answer: a

14. 4.1 g g = _____ g
11.180
11.18
11.2 11
Answer: c

15. 6.9 g – 5.07 g = _____ g
1.830
1.83
1.8 1
Answer: c

16. 5.2 cm × 7.01 cm = ____ cm2 36
36.4
36.45
36.452
Answer: a

17. 6.03 g ÷ 7.1 mL = _____ g/mL
0.8
0.85
0.849
Answer: b

18. Chapter 1 Book Notes How do I classify states of matter? EQ:
How do I use measurement in chemistry?
EQ:
1.5 Dimensional Analysis
Converting Units
Conversion Factors

19. Dimensional Analysis
We use dimensional analysis to convert one quantity to another.
Most commonly, dimensional analysis utilizes conversion factors (e.g., 1 in. = 2.54 cm).
We can set up a ratio of comparison for the equality either 1 in/2.54 cm or 2.54 cm/1 in.
We use the ratio which allows us to change units (puts the units we have in the denominator to cancel).

20. Check for Understanding
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Check for Understanding
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21. 120 mL = _____ fl oz 2 4 6 8
Answer: b
30 mL = 1 fl oz

22. 35.0 mi/hr = _____ m/s 1 mile = 1609 meters 56300 m/s 939 m/s

23. Reading and Notetaking Schedule
READ THROUGH: Reading and Notetaking Schedule for Units 2 & 6 and 3 TAKE OUT: Book PUT: Post It Notes at due date places (see example) TIME: 3 MINUTES WHEN DONE: Ask any question you might have about schedule and policy

24. Take out Homework Packet
SHARE IDEAS: From Significant Figures pages IF YOU HAVE A DIFFERENT ANSWER: Be prepared to correct it, ask questions of your team, OR justify your answer USE: White board, if needed to explain something TIME: 6 MINUTES WHEN DONE: Be ready to share out questions or insights

25. Correct Homework Packet
SHARE IDEAS: From Matter Practice IF YOU HAVE A DIFFERENT ANSWER: Be prepared to correct it, ask questions of your team, OR justify your answer USE: White board, if needed to explain something TIME: 3 MINUTES WHEN DONE: Be ready to share out questions or insights

26. Structure of Quiz BASED ON: Format of AP Exam
90 minutes = 60 multiple-choice questions (50%)
105 minutes = 7 free response questions (50%)
UNIT QUIZZES: 10 multiple-choice questions = 15 minutes (50%)
1 shorter free response type question = 10 minutes (50%)