Today’s Do Now Read the following article titled, ‘Critical Units!’ and answer the questions that follow. As you read the article, highlight or underline important points.

Today’s Do Now 8/11/14 1. What unit system is used in science? What two parts must be present in a measurement? 2. Based upon the article above, what are two reasons to include units in a measurement? 3. In your opinion, should the United States completely switch to using the metric system? Why or why not?

Procedure for Introduction to New Materials 1) SLANT 2) Only talk when called upon 3) Raise your hand if you have a question or answer 4) Take notes; if it is on the board you should write it down 5) Make class work for you!

By the end of the class period today I will be able to… Categorize measurements as being accurate and/or precise Represent numbers in scientific notation and perform calculations

Accuracy and Precision So we don’t lose millions of dollars!!

Today’s Game Plan Do Now 13 minutes INM: Accuracy and Precision 10 minutes The Accuracy and Precision Challenge 15 minutes Scientific Notation 15 minutes SciNot Practice 10 minutes Independent Practice 15 minutes Closing, Exit Ticket 10 minutes

Accuracy vs. Precision Accuracy refers to how close a measured value is to the true value. Precision refers to how close a series of measurements are to one another.

A Continuum of Precision I have 5 different pieces of lab equipment numbered and displayed on my desk. With your desk partner, order the equipment by number from most precise to least precise

How Close Were You??

What makes one piece of lab equipment more precise than another? A piece of lab equipment is more precise than another if it has smaller increments (Ex: A graduated cylinder with 0.5 mL increments is more precise than a graduated cylinder with 1 mL increments)

Which of the following pieces of equipment is the most precise?

A value with more digits is more precise. (3.52 is more precise than 3.5) What makes one measurement of more precise than another?

A measurement or series of measurements can be accurate and precise, inaccurate and precise, or inaccurate and imprecise

Accuracy and precision: the target example Accurate and precise

Accuracy and precision: the target example Precise, but not accurate

Accuracy and precision: the target example Neither accurate, nor precise

Today’s Game Plan Do Now 13 minutes INM: Accuracy and Precision 10 minutes The Accuracy and Precision Challenge 15 minutes Scientific Notation 15 minutes SciNot Practice 10 minutes Independent Practice 15 minutes Closing, Exit Ticket 10 minutes

The Accuracy and Precision Challenge! Partners Each partner group will be given a scenario and a criteria for accuracy and precision 5 minutes to prepare a small poster to display their scenario and explain how their criteria applies. Each group will receive a sheet of paper. Watch Out!! I will randomly call 2 or more groups to share at the end of class!

Today’s Game Plan Do Now 13 minutes INM: Accuracy and Precision 10 minutes The Accuracy and Precision Challenge 15 minutes Scientific Notation 15 minutes SciNot Practice 10 minutes Independent Practice 15 minutes Closing, Exit Ticket 10 minutes

Scientific Notation Because we shouldn’t have to write 20 zeros

Why do we use Scientific Notation? Scientific notation is used in chemistry to represent very large and very small numbers Length of swine flu virus: diameter of 10 to 300 nanometers (nanometer is equal to one billionth of a meter) m becomes 1.0 x m

Scientific Notation Expresses a number as the product of a number between 1 and 10 and a power of 10 Ex: 93,000,000 = 9.3 x 10 7

Numbers Larger than 1 Numbers larger than 1 are expressed with a power of 10 that is positive can be written as 6.02 x 10 23

Numbers smaller than 1 Numbers smaller than 1 are expressed with a power of 10 that is negative cm can be written 1.0 x cm

Today’s Game Plan Do Now 13 minutes INM: Accuracy and Precision 10 minutes The Accuracy and Precision Challenge 15 minutes Scientific Notation 15 minutes SciNot Practice 10 minutes Independent Practice 15 minutes Closing, Exit Ticket 10 minutes

Raise ‘em Up! Expectations: 1)Every person participates 2)Hold up your answer up only when I give the signal 3)Focused on chemistry

1,500, x 10 6

x 10 -4

x 10 1

Opposite Challenge: Write in Standard Notation 7.8 x

How do I enter numbers in scientific notation in my calculator? Most Important Rules: -Use the exponent key instead of ^ -Always put numbers in ( )

Solve the following problem (2.17 x )(3.4 x )

Solve the following problem (8.67 x 10 5 )/(5.998 x 10 3 )

Today’s Game Plan Do Now 13 minutes INM: Accuracy and Precision 10 minutes The Accuracy and Precision Challenge 15 minutes Scientific Notation 15 minutes SciNot Practice 10 minutes Independent Practice 15 minutes Closing, Exit Ticket 10 minutes

Today’s Game Plan Do Now 13 minutes INM: Accuracy and Precision 10 minutes The Accuracy and Precision Challenge 15 minutes Scientific Notation 15 minutes SciNot Practice 10 minutes Independent Practice 15 minutes Closing, Exit Ticket 10 minutes

Closing Accuracy vs. Precision? Examples? 3.44 x Name as many parts of this number as you can that definitively make it in scientific notation

Today’s Homework Accuracy and Precision Worksheet Study for your 1 st Quiz !