2. Welcome Back! Opening Activity 1.What geological forces are at play here? 2.Which layers are the oldest? Youngest? Sideling Hill, Pennsylvania 2016

3. Unit 6 Test You will have two weeks to do test corrections and/or test retakes. Test correction “HELP SHEET” will be posted online today after school. (questions, pictures, graphs, tables, etc. that you need to do the corrections) The retakes will be available online (you must be in teacher’s presence) starting Wednesday. You will need to come in before/after school, or during lunch. The retake WILL NOT be available during class.

4. Unit 7: Introduction to High School Science Chemistry Subunit

5. What to Expect

7. What to REALLY expect Emphasis on REAL WORLD connections (and what you need to know for high school) Lab safety at ALL times 1-2 hands-on labs/demos each week Notes, practice worksheets, quizzes each Friday. Computer/Laptop and Notebook use almost daily And of course… everyone’s favorite… MATH! (it’s a part of science)

8. Chemistry Subunit Week 1 Monday: New Unit expectations, Review Lab Safety, Review Scientific Notation Tuesday: Measuring skills pre-assessment, importance of measuring accurately, measuring skills post-assessment Wednesday: Periodic table. Review protons, neutrons, and electrons. Thursday: Basic electron properties and predicting basic reactions. Friday: Week 1 quiz, chemistry videos/demos online

9. Chemistry Subunit Week 2 Monday: Basic reactions and law of conservation Tuesday: Reaction Lab – what reacts, what doesn’t Wednesday: Acid and Bases in the real world Thursday: Acid/Bases lab Friday: Chemistry Quest, more chemistry videos/demos online.

10. Laptops Practice and Expectations You must use the SAME laptop EVERY day. Match your roster number with your computer number. You must check computer for damage immediately and report any damages. You must put your computer away EVERY day in the CORRECT location and PLUGGED IN with the correct charger. You will LOSE points each week if not done correctly.

11. How to Take Notes Using Laptop There may be MANY ways to do this, but we’ll use the “comments” or simply type the text.

12. Lab Safety Top 5 Lab Rules We should already know these from unit 1 at the beginning of the year. You also signed a lab safety contract. These will be on the Friday quiz. Three lab violations (strikes), we will stop the lab activity for the entire class.

13. Lab Safety Most accidents are not your own fault, they are accidents! Eye protection MUST be worn at all times! Eyes WILL NOT, DO NOT heal!

14. Lab Safety (cont.) No horseplay. Again, 1 second can change your life or someone else’s life forever.

15. Lab Safety (cont.) Treat ALL chemicals as if they are dangerous! Even if you think you know what they are, treat them with care. No eating or drinking (even water) on lab days.

16. Lab Safety (cont.) Teacher must be made aware of broken glass. Accidents will happen. Broken glass goes in the “broken glass” box, NOT the garbage bin.

17. Lab Safety (cont.) Follow ALL instructions as they are presented. Directions will be made verbally and written in clear, simple steps. If you ask “what are we supposed to do?” teacher will respond with “read the instructions.”

18. Scientific Notation

19. Scientific Notation is used to express the very large and the very small numbers so that problem solving will be made easier. Examples: The mass of one gold atom is.000 000 000 000 000 000 000 327 grams. One gram of hydrogen contains 602 000 000 000 000 000 000 000 hydrogen atoms. Scientists can work with very large and very small numbers more easily if the numbers are written in scientific notation.

20. How to Use Scientific Notation In scientific notation, a number is written as the product of two numbers….. …..a coefficient and 10 raised to a power.

21. The number 4,500 is written in scientific notation as ________________. 4.5 x 10 3 The coefficient is _________. The coefficient must be a number greater than or equal to 1 and smaller than 10. 4.5 The power of 10 or exponent in this example is ______. 3 The exponent indicates how many times the coefficient must be multiplied by 10 to equal the original number of 4,500.

22. If a number is greater than 10, the exponent will be _____________ and is equal to the number of places the decimal must be moved to the ________ to write the number in scientific notation. positive left

23. If a number is less than 10, the exponent will be _____________ and is equal to the number of places the decimal must be moved to the ________ to write the number in scientific notation. negative right

24. A number will have an exponent of zero if: ….the number is equal to or greater than 1, but less than 10.

25. 1. Move the decimal to the right of the first non-zero number. 2. Count how many places the decimal had to be moved. 3. If the decimal had to be moved to the right, the exponent is negative. 4. If the decimal had to be moved to the left, the exponent is positive. To write a number in scientific notation:

26. Practice Problems Put these numbers in scientific notation. 1).00012 2) 1000 3) 0.01 4) 12 5).987 6) 596 7).000 000 7 8) 1,000,000 9).001257 10) 987,653,000,000 11) 8 PROBLEMS 1) 1.2 x 10 -4 2) 1 x 10 3 3) 1 x 10 -2 4) 1.2 x 10 1 5) 9.87 x 10 -1 6) 5.96 x 10 2 7) 7.0 x 10 -7 8) 1.0 x 10 6 9) 1.26 x 10 -3 10) 9.88 x 10 11 11) 8 x 10 0 1) 1.2 x 10 -4 2) 1 x 10 3 3) 1 x 10 -2 4) 1.2 x 10 1 5) 9.87 x 10 -1 6) 5.96 x 10 2 7) 7.0 x 10 -7 8) 1.0 x 10 6 9) 1.26 x 10 -3 10) 9.88 x 10 11 11) 8 x 10 0 ANSWERS

27. EXPRESS THE FOLLOWING AS WHOLE NUMBERS OR AS DECIMALS PROBLEMSANSWERS 1) 4.9 X 10 2 2) 3.75 X 10 -2 3) 5.95 X 10 -4 4) 9.46 X 10 3 5) 3.87 X 10 1 6) 7.10 X 10 0 7) 8.2 X 10 -5 1)490 2).0375 3).000595 4)9460 5)38.7 6)7.10 7).000082

28. Using Scientific Notation in Multiplication, Division, Addition and Subtraction Scientists must be able to use very large and very small numbers in mathematical calculations. As a student in this class, you will have to be able to multiply, divide, add and subtract numbers that are written in scientific notation. Here are the rules.

29. Multiplication When multiplying numbers written in scientific notation…..multiply the first factor/coefficients and add the exponents. Sample Problem: Multiply (3.2 x 10 -3 ) (2.1 x 10 5 ) Solution: Multiply 3.2 x 2.1. Add the exponents -3 + 5 Answer: 6.7 x 10 2

30. Division Divide the numerator by the denominator. Subtract the exponent in the denominator from the exponent in the numerator. Sample Problem: Divide (6.4 x 10 6 ) by (1.7 x 10 2 ) Solution: Divide 6.4 by 1.7. Subtract the exponents 6 - 2 Answer: 3.8 x 10 4

31. Addition and Subtraction To add or subtract numbers written in scientific notation, you must….express them with the same power of ten. Sample Problem: Add (5.8 x 10 3 ) and (2.16 x 10 4 ) Solution: Since the two numbers are not expressed as the same power of ten, one of the numbers will have to be rewritten in the same power of ten as the other. 5.8 x 10 3 =.58 x 10 4 so.58 x 10 4 + 2.16 x 10 4 =? Answer: 2.74 x 10 4