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?

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.

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

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

Unit 5: The Mole Dimensional Analysis

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.

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

Unit 5: The Mole Scientific Notation

Think about it… The growth of a fingernail is 0.000015 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?

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

Anatomy of A Number in Scientific Notation

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.

How many times did we move the decimal point? Example The growth of a fingernail is measured in 0.000015 millimeters per hour Example: Let’s put 0.000015 in scientific notation. 0.000015  How many times did we move the decimal point? Since the original number was less than one, the exponent will be negative.

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.

Partner Practice Convert the following into scientific notation: 61,500 kg 0.00043 mm 1,000,000 protons 0.0345 grams

Fixing Numbers in Scientific Notation

Multiplying To multiply two numbers written in scientific notation: Multiply the first two numbers Add the exponents Adjust the leading number as needed. Example: 1.02 x 105 x 3.43 X 10-4

Partner Practice 2 x 106 X 4 x 102

Dividing To divide two numbers written in scientific notation: Divide the first two numbers Subtract the exponents Adjust the leading number as needed. Example: 8.496 x 107 3.6 x 10-8

Partner Practice 6.0 x 105 3.0 x 102

Homework 5.1