1. Quiz: Identify the following as physical or chemical changes: 1.melting zinc 2.silver tarnishing 3.sanding copper to a shine Answer the following questions: 4. 4.Which branch of chemistry that is concerned with the identification and composition of materials 5. 5.Which branch of chemistry is concerned with the properties, changes, and mathematical relationships between energy and matter. 6.Why should your hair be kept far from fire? 7.How is matter defined? 8.How is energy defined? 9.Which Branch of chemistry is concerned with identifying unknown compounds? 1.physical change 2.chemical change 3.physical change 4.Analytical Chemistry 5.Physical Chemistry 6.Hair is very flammable 7.Matter is anything with inertia or anything with mass and volume 8.Energy is the ABILITY to do work. 9.Analytical Chemistry

2. Today Make sure all of the parts of the lab are complete: A summary of the introduction A summary of the introduction Pre-lab questions are answered Pre-lab questions are answered Procedures are clearly written Procedures are clearly written Data Table is ready to be filled in. Data Table is ready to be filled in. You are beginning to answer Post-lab questions. You are beginning to answer Post-lab questions. Homework: You should have turned in HW 1  4, You should turn in homework 5. (Extra Credit if turned in by Monday) Homework: You should have turned in HW 1  4, You should turn in homework 5. (Extra Credit if turned in by Monday)

3. Homework Homework #5: Do #6-9 page 62 Lab # 5 page 29 in lab manual. Homework #6: Re-read pages 63-68; Do # 10 a  e; page 64; #11  18 page 69; Homework #5: Do #6-9 page 62Lab # 5 page 29 in lab manual.Homework #6: Re-read pages 63-68; Do # 10 a  e; page 64; #11  18 page 69 Homework #5: Do #6-9 page 62Lab # 5 page 29 in lab manual.Homework #6: Re-read pages 63-68; Do # 10 a  e; page 64; #11  18 page 69 Due Monday! Due in one WEEK Due byThursday Homework #7: Do # 28  36 page 72 (evens only) Due Friday Lab #4 page 23 in lab manual

4. Really Short Lecture so you can understand HW 6 Really Short Lecture so you can understand HW 6

5. Conversions: page 64 (for HW 6) Joules are measurements of energy calories and Calories are measurements of energy Calories = 1000 calories = Kilocalories SI unit for heat/thermal energy is Joules. after Sir Charles’ Joule. after Sir Charles’ Joule. 1 calorie = 4.184 Joules This is a given: Make a flash-card of this!

6. This is your conversion factor How to do Conversions This is given in the problem Always multiply the numerator! Always Divide the Denominator

7. 1 calorie 4.184 Joules How to do Conversions 1980 joules Always multiply the numerator! Always Divide the Denominator 1980 J x 1 cal. 4.184 J = 473 calories

8. Remember, You can have as many conversion factors in a row as you want! But, you always MULTIPLY THE NUMERATOR AND you always DIVIDE THE DENOMINATOR X 

9. Homework 5

10. 6. Classify the following as extensive or intensive a.mass b.color c.ductility d.length e.melting point a.extensive b.intensive c.intensive d.extensive e.intensive

11. 7. Classify each as chemical or physical a.fading of dye in cloth b.growth of a plant c.melting of ice d.digestion of food e.formation of clouds in the air f.healing a wound g.making rock candy by evaporation h.light from an electric light. chemical (physical if from machine washing) chemicalphysicalchemicalphysicalchemicalphysicalphysical

12. 8. Classify the following as physical or chemical properties. a.color b.reactivity c.flammability d.odor e.porosity f.stability g.ductility h.solubility i.thermal expansion j.melting point k.catches fire in air. a.physical b.chemical c.chemical d.physical e.physical f.chemical g.physical h.physical i.physical j.physical k.chemical

13. 9. Helium doesn’t react, does it have “no chemical properties” No, it has the chemical property of being un-reactive, non-flammable, and stable,…