Warm Up Work Silently. Ask Ms. H questions! What does it mean “to evaluate”? What does it mean if a college basketball recruiter is “evaluating a player”? Would you rather be able to hit the same spot on the backboard every time OR always score an average of 40 points? 15 minutes

Unit 1 Grandmasters 3 minutes

Chemistry Tracker What’s a tracker? What’s a GLE? - To track your success in Unit 1 - It will show you how well you did on each GLE What’s a GLE? Resume- shows your experience from that experience you got skills Shows people who are trying to hire you why you would be a good person for the job. This is the same thing It will track how you do on each GLE to see if you have the skills you should have for chemistry. 80% or above it considered mastery….mastery means?? Master P, Grandmaster Flash? 1 person to pass out calculators; I pass out exams -

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! Get 20 min tutoring Retake the GLEs you didn’t master Raise your grade 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

The study of MATTER and its CHANGES Chemistry The study of MATTER and its CHANGES

Criteria To be MATTER it… must have mass (be made of stuff) must have volume (take up space) Spend time changing the definition of matter to the

Does this matter? count down. 3-2-1 YES 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? Average = 6.0 Literature Value= 6.03 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? Average = 5.53 Textbook Value= 7.10 Trial Measurement 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. Not doing it. Add Key Points, add IP questions. ~ 10

Accuracy, Precision and % Error Percent Error %E = Vactual – Vmeasured X 100 Vactual |-------| Addd slide what is acceptable percent error

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 Measuring a string you get 18 cm, but Ms. Hughes tells you the string is actually 20 cm long.

Accuracy, Precision and % Error [(20 – 18)/20] x 100

Accuracy, Precision and % Error [(20 – 18)/20] x 100 = 10%

Accuracy, Precision and % Error Measured: 88 mL Actual: 83 mL

Accuracy, Precision and % Error 6.0%

Accuracy, Precision and % Error Measured: 140 g Actual: 122 g

Accuracy, Precision and % Error 14.8%

Accuracy, Precision and % Error Measured: 3438 m Actual: 4888 m

Accuracy, Precision and % 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? For now, work ALONE Best ranking wins Find out tomorrow… For now, work ALONE Best ranking wins

Binders Do nows/exit slips Homework Notes/Practice Demos/Labs Tracking

Homework Top Ten: how’d we do? Half sheet of accuracy + precision, % error practice

Exit slip Define accuracy Define precision Can percent error ever be negative? Why or why not?