1. Science Starter Week 9- Day 1 (4/4/16)
What would be the best way to calculate how many peanuts are in this container?
How many eggs in a dozen? In a gross?
How many protons, neutrons, and electrons in a neutral atom of C-13?
How far away is the sun from Earth?

2. Objective SWBAT use dimensional analysis to solve conversion problems
SWBAT put numbers into scientific notation from standard and vice versa.
SWBAT fix incorrect scientific notation
SWBAT multiply and divide numbers in scientific notation.

3. Agenda Science Starter Dimensional Analysis Scientific Notation
Converting from standard to SciNote and vice versa
Multiplying/Dividing
Exit Ticket/Homework

4. Announcements
Today: Conversions & Scientific Notation
Tuesday: Intro to the Mole
Wednesday: Molar Conversions (1 & 2)
Thursday: Molar Conversions Quiz
Friday: Empirical/Molecular Formulas

5. Unit 5: The Mole Dimensional Analysis

7. What you’re given in problem
General Formula
What you’re given in problem
Find unit
Given unit
The thing in the “fraction” is CONSTANT—we call this a conversion factor.

10. Practice Remember: Set it up as a dimensional analysis problem!
How many eggs in 4 dozen?
How many days in 350,000 seconds?

11. Unit 5: The Mole Scientific Notation

12. Think about it…
The growth of a fingernail is millimeters per hour
The sun’s temperature reaches 27,000,000 degrees Fahrenheit.
The distance from the Earth to the Sun is about 93,000,000 miles.
Would you want to compute math
problems with these crazy numbers??
What can we do to make these
more manageable?

13. Background Info Scientific Notation!!!
Scientific notation is a way of writing a number as a multiplication problem where..
The first number is no smaller than 1 and less than 10 (decimals ok)
And
The second number is a power of 10

14. Anatomy of A Number in Scientific Notation

15. Steps Time to practice your SHORTHAND!!!
Place decimal point so that there is only one non- zero number to the left of the decimal point.
Count the number of decimal places the decimal has “moved”. This will be your exponent.
If the original number was less than 1, the exponent will be negative. If it was greater than 1, the exponent will be positive.

16. How many times did we move the decimal point?
Example
The growth of a fingernail is measured in millimeters per hour
Example: Let’s put in scientific notation. 
How many times did we move the decimal point?
Since the original number was less than one, the exponent will be negative.

17. How many times did we move the decimal point?
Example
The distance from the Earth to the Sun is about 93,000,000 miles.
Example: Let’s put 93,000,000 in scientific notation.
93,000,000 
How many times did we move the decimal point?
Since the original number was greater than one, the exponent will be positive.

18. Partner Practice
Convert the following into scientific notation: 61,500 kg mm 1,000,000 protons grams

19. Fixing Numbers in Scientific Notation

20. Multiplying To multiply two numbers written in scientific notation:
Multiply the first two numbers
Add the exponents
Adjust the leading number as needed.
Example: x x X 10-4

21. Partner Practice
2 x X 4 x 102

22. Dividing To divide two numbers written in scientific notation:
Divide the first two numbers
Subtract the exponents
Adjust the leading number as needed.
Example: x 107
3.6 x 10-8

23. Partner Practice
6.0 x 105
3.0 x 102

24. Homework 5.1