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Warm UpWork Silently. Ask Ms. H questions!
1. What does it mean “to evaluate”?
2. What does it mean if a college basketball recruiter is “evaluating a player”?
3. Would you rather be able to hit the same spot on the backboard every time OR always score an average of 40 points?
GrandmastersUnit
1
Chemistry Tracker
•What’s a tracker?- To track your success in Unit 1- It will show you how well you did
on each GLE
•What’s a GLE?
The BIG GOAL:
80% Mastery
of ALL GLEs
Why 80% Mastery?
• Graduate high school
• Pass the GEE Science Exam
• Graduate college
• Solve your own problems
• $$$
If I didn’t get mastery, is that it?
No!
1. Get 20 min tutoring
2. Retake the GLEs you didn’t master
3. Raise your grade
4. Increase future opportunities!
Group Work:Complete Resumes
• Introduce yourself to your team• Always help each other, but work only with your
team.• Keep your voices below the music.• RAISE your hand to ask questions.• Stack your group’s TESTS & Résumé I will pick
them up
Goal Sheets
• I believe you all 1) CAN and 2) WILL master Chemistry
• Pick 1 goal for yourself
• Relate that goal to mastering Chemistry
• Complete your goal sheet
• Then, EARN IT
Done with Unit 1…
Unit 2: Matter
Test on Friday
Chemistry
The study of MATTER and its CHANGES
Criteria
To be MATTER it…1. must have mass (be
made of stuff)2.must have volume (take
up space)
Does this matter?count down.
3-2-1YES or NO
Does this matter?
book
Does this matter?
car
Does this matter?
thoughts
Does this matter?
water
Does this matter?
happiness
Does this matter?
eggs
Does this matter?
opinions
Does this matter?
air
Does this matter?
grades
Does this matter?
chair
Does this matter?
sleepiness
Does this matter?
jello
Does this matter?
hunger
Does this matter?
Sulfuric acid
Does this matter?
Sodium hydroxide
So….
Chemistry is about studying STUFF in the world and
how that stuff can change.
Accuracy, Precision and Percent Error
Accuracy = getting the right answer ON AVERAGE
Other words for “right answer”• True value• Accepted value• Actual value• Textbook value• Literature value
Accurate or not?
Trial Measurement
1 7.1
2 5.9
3 8.0
Average =
6.0
Literature Value= 6.03
Precision = getting the SAME answer again and again
Precise or not?
Trial Measurement
1 5.53
2 5.54
3 5.52
Average =
5.53
Textbook Value=
7.10
Accurate? Precise? Both? Neither?
Trial Measurement
1 5.5
2 10.0
3 4.5
Average =
10.0
Accepted Value=
20.5
Accurate? Precise? Both? Neither?
Trial Measurement
1 73.7
2 73.4
3 73.6
Average =
73.6
Accepted Value=
73.57
Percent error
• Percent error= Tells you how far off your measurement is.
Accuracy, Precision and % Error
Percent Error
%E = Vactual – Vmeasured X 100
Vactual
|-------|
Accuracy, Precision and % Error
Percent Error Formula includes absolute value sign
You may never have a negative answer with % error, just drop the negative!
Accuracy, Precision and % Error
% error:Measuring a string you get 18 cm, but Ms. Hughes tells you the string is actually 20 cm long.
Accuracy, Precision and % Error
% error:
[(20 – 18)/20] x 100
Accuracy, Precision and % Error
% error:
[(20 – 18)/20] x 100 = 10%
Accuracy, Precision and % Error
% error:
Measured: 88 mLActual: 83 mL
Accuracy, Precision and % Error
% error:
6.0%
Accuracy, Precision and % Error
% error:
Measured: 140 gActual: 122 g
Accuracy, Precision and % Error
% error:
14.8%
Accuracy, Precision and % Error
% error:
Measured: 3438 mActual: 4888 m
Accuracy, Precision and % Error
% error:
29.7%
Stations!
• 8 total
• Answer all on separate sheet of paper
• Return calculators when finished
• Work on your own
• If finished early, start binder organization
Synergy Exercise
•What’s Synergy?–Find out tomorrow…
•For now, work ALONE•Best ranking wins
Binders
• Do nows/exit slips
• Homework
• Notes/Practice
• Demos/Labs
• Tracking
Homework1.Half sheet of accuracy +
precision, % error practice
Top Ten: how’d we do?
Exit slip
1. Define accuracy
2. Define precision
3. Can percent error ever be negative? Why or why not?
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