1. DO NOW – DENSITY REVIEW (SHOW WORK) 1. Find the Density of an object that has a mass of 10g and a volume of 5 cm 3. 2. Find the Density of an object that has a mass of 5g and a volume of 10 cm 3. 3. Find the mass of an object that has density of 2g/cm 3 and a volume of 5cm 3. 4. Find the volume of an object that has a mass of 100g and a density of 25g/cm 3. D v X ÷ ÷ m D = m ÷ vD = 10 ÷ 5D = 2 g/cm 3 D = m ÷ v D = 5 ÷ 10 D =.5 g/cm 3 m = D x v m = 2g/cm 3 x 5cm 3 m = 10g v = m ÷ Dv = 100g ÷ 25g/cm 3 v = 4cm 3

2. HOMEWORK AND ANNOUNCEMENTS Due Today: vocabulary word find Science Fair – written summaries and updated forms. Chapter 9 textbook pages 322-327 (grade tomorrow) USA TestPrep (due today) Quarter 1 Extra Credit deadline (Monday 10/26/15)

3. L.O. SWBAT use the periodic table to determine the number of p+ and e- in an atom. Using the Periodic Table

5. Chemical Symbol Represents an element 1 or 2 letters 1 st letter capitalized & 2 nd letter lower case Example: C = Carbon O = Oxygen Co = Cobalt Non-Example CO = Carbon monoxide (Compound: Carbon and Oxygen ) 6 C 12.01 Chemical Symbol Carbon

6. 1.Oxygen 2.Lithium 3.Beryllium 4.Potassium 5.Argon 6.Chlorine 7.Phosphorus 8.Aluminum 9.Silver 10.Tin O Li Be K Ar Cl P Al Ag Sn Use your periodic table to find the chemical symbol for the following elements. (Write the element and your answer in your notes)

7. Atomic Number Equals # of protons in an atom. Equals # of electrons in an atom. Each element has a different atomic number. 6 C 12.01 Atomic Number Carbon

8. 1.Oxygen 2.Lithium 3.Beryllium 4.Potassium 5.Argon 6.Chlorine 7.Phosphorus 8.Aluminum 9.Silver 10.Tin 8 3 4 19 18 17 15 13 47 50 Use your periodic table to find the atomic number for the following elements. (Next to the chemical symbol, write the # of p +.)

9. Atomic Number Average mass of an element’s atoms. 6 C 12.01 Atomic Mass Carbon

10. 1.Oxygen 2.Lithium 3.Beryllium 4.Potassium 5.Argon 6.Chlorine 7.Phosphorus 8.Aluminum 9.Silver 10.Tin 16 7 9 39 40 35 31 27 108 119 Use your periodic table to find the atomic mass for the following elements. (Write the atomic mass in your notes)

11. A little math… Atomic Mass - Atomic Number # of neutrons 6 C 12.01 Atomic Mass Carbon Atomic Number

12. Try it!! How many neutrons does a carbon atom have? 6 C 12.01 Atomic Mass Carbon Atomic Number 12 - 6 6 neutrons

13. 5 B Boron 10.81 2 He Helium 4.003 11 Na Sodium 22.990 17 Cl Chlorine 35.453 Raise your hand to answer the following. 1.What is the atomic number for Chlorine? 2.What is the atomic number for Boron? 3.How many protons are in an atom of Na? 4.How many protons are in an atom of He? 5.How many electrons are in an atom of Cl? 6.How many protons are in an atom of Chlorine? 7.What is the atomic mass of Helium? 8.How many neutrons does Helium have? 17 5 11 2 17 4 4 – 2 = 2

14. + + + n n n n e-e- e-e- e-e- What do you see? Protons:____ Electrons: ____ Neutrons:____ Mass Number: ________ What do you know? Atomic Number: ____ Element Name: ________ Chemical Symbol:____ Avg. Atomic Mass: _____ e-e- + n Practice What do you know! 10 12 p + + n = 22 10 Ne Neon 20.18 e-e- e-e- e-e- e-e- e-e- e-e- + + + + + + n n n n n n n Hints: p + = 10 n = 12 mass number = (p + ) + n

15. Summary (3-4 sentences) Today I learned about… Helper questions How do we determine the number of p+ an atom has? Electrons? Netrons?

16. Independent Work Textbook Pages 322-327 Vocabulary Word Find definitions (in notebook)