1. It Was Here Just a Moment Ago!

2. STAAR Category 1 Matter and Energy TEKS (8.5) The student knows that matter is composed of atoms and has chemical and physical properties. The student is expected to: (E) investigate how evidence of chemical reactions indicate that new substances with different properties are formed; and

3. Learning Objectives 1. The student will demonstrate chemical change as evidenced by a change in color. 2. The student will measure temperature change as the result of a chemical reaction. 3. The student will demonstrate a chemical reaction that produces gases. 4. The student will demonstrate a chemical change that results in the formation of a precipitate. 5. The student will use models to explain chemical formulas.

4. ENGAGE Balloon Gas –What happened?

5. Physical vs Chemical Change

6. Physical Changes Alter the size &/or shape Cut, grind, dissolve

7. Phase Changes Physical Changes

8. Easily changed back to original form

9. Chemical Changes New stuff is made Cannot change new stuff back into original form easily Chemical composition of new substance is different from original

10. Raw Chicken Cooked Chicken Physical or Chemical? Write your explanation on page 7 of your IAN Bellringer 10/14/2014- You must complete to do the lab!

11. 5 Evidences of Chemical Change 1.Precipitate (2 clears make a cloudy) 2.Energy change (hot, cold, light, sound, electricity, etc.) 3.(Unexpected) Color Change 4.Bubbles, fizzing, gas produced 5.Smell Change

12. How to remember Please= Precipitate Excuse = energy change Burps = bubbles Coughs = color change Sneezes = smell change

13. #1 Precipitate Two clear solutions make a cloudy solution

14. #2 Energy Change As candle was burns, it gives off heat and light

15. #3 Color Change (Unexpected) Colorless methane burns blue

16. #4 Bubbles or Fizzing Alka Seltzer in water makes carbon dioxide gas

17. #5 Smell Change Baked cupcakes smell differently than batter

18. Physical or Chemical? You decide... How do you know?

19. Physical or Chemical? You decide... How do you know?

20. Physical or Chemical? You decide... How do you know?

21. Chemical Changes Foldable Chemical Changes Foldable- Glue to page 41 Page 42: title- –“Chemical Changes Mini Labs 1 and 2” Page 43: title- –“Chemical Changes Mini Labs 3 and 4”

22. Mini Lab #1 Materials: 15 mL of acetic acid, spoonful of sodium bicarbonate Prediction “I think ___________will happen when I mix acetic acid and sodium bicarbonate together.” Results:

23. Mini Lab #1 1.Use the graduated cylinder to add 15 milliliters of acetic acid to the baggie containing sodium bicarbonate. Close it tightly. 2.Observe the baggie with your eyes and hands as the change takes place. 3.Record evidence of a chemical change on your sheet.

24. Results A chemical change (did/did not) occur because ______________happened

25. Mini Lab #2 Materials: 20 mL of water, 1/2 spoonful of sodium bicarbonate, 2 spoonfuls of calcium chloride Prediction: I think ____________ will happen when I mix water, sodium bicarbonate, and calcium chloride together.

26. Mini Lab #2 1.Mix a spoonful of sodium bicarbonate and a spoonful of calcium chloride together inside a plastic bag. 2.Use the graduated cylinder to add 15 ml of acetic acid to the bag. Close it quickly! 3.Observe the baggie with your eyes and hands as the change takes place. 4.Record evidence of a chemical change on your sheet.

27. Mini Lab #3 Materials: 10 mL of acetic acid, 5 drops of universal indicator Prediction: “I think ____________will happen when I mix acetic acid and universal indicator together.”

28. Mini Lab #3 1.Add 10 ml of acetic acid to a graduated cylinder. 2.Pour the acetic acid into the small beaker. 3.Add 1 dropper of universal indicator or cabbage juice to the beaker. 4.Observe the beaker with your eyes and as the change takes place. 5.Record evidence of a chemical change on page 42 of your IAN.

29. EXPLORE Red Light – Green Light For the Rust of My Life Take a Powder Clabbered Clumps Witches Brew Bubble, Bubble, Toil & Trouble It’s All Aglow Chemical Sunshine

30. –Please- Precipitate (2 clears make cloudy) –Excuse- Energy change (heat, light, sound, electricity) –Coughs- Color change (unexpected) –Sneezes- Smell Change –Burps- Bubbles or fizzing (gas produced) Evidence of Chemical Change

31. EXPLAIN Every reaction we did shows evidence of chemical change- what are 5? –Please- Precipitate (2 clears make cloudy) –Excuse- Energy change (heat, light, sound, electricity) –Coughs- Color change (unexpected) –Sneezes- Smell Change –Burps- Bubbles or fizzing (gas produced)

32. ELABORATE Mixing it Up Irreversible Consequences

33. Bellringer 10/20/2014- pg 7 or 8 What is a precipitate?

34. Homework Study for your vocabulary quiz (summative)!!! Quiz is on Wednesday!!!! Words: subscript, coefficient, chemical formula, alkali metal, noble gas, metal, nonmetal, metalloid, group, period, atom, proton, neutron, electron, valence electron

35. Classwork Atoms Retest (front of the room): Watch the Atomic model brainpop and complete the quiz Lab (back of the room): follow the lab directions for mini lab #6. If you complete you can finish any mini lab that you did not complete.

36. True or False Chemicals are only found in chem labs Fabulous Fact or Mystical Myth

37. Chemistry runs everyone and everything!

38. True or False Physical and chemical changes never happen at the same

39. True or False Energy changes during a chemical reaction always give off heat

40. Energy changes during chemical reactions can give off heat and get hotter, absorb heat and get colder, give off light, sound, and electricity, etc.

41. EVALUATE How many atoms of copper in 2 molecules Cu 2 O? What happens to atoms in chemical reactions? What physical properties can change in a chemical reaction?