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DO NOW! Happy Tuesday! 12/04/2012 DO NOW! 1.What are the 4 indicators of a chemical reaction? 2.How is a physical reaction different from a chemical reaction?

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Presentation on theme: "DO NOW! Happy Tuesday! 12/04/2012 DO NOW! 1.What are the 4 indicators of a chemical reaction? 2.How is a physical reaction different from a chemical reaction?"— Presentation transcript:

1 DO NOW! Happy Tuesday! 12/04/2012 DO NOW! 1.What are the 4 indicators of a chemical reaction? 2.How is a physical reaction different from a chemical reaction? 3.Label the following “CC” for chemical change or “PC” for physical change: – Burning – Rotting – Rusting – Melting – Combining baking soda and vinegar

2 ACTIVATOR - Reactions Watch the video and write down any reactions you see.video – Are they chemical or physical changes do you think?

3 HOT Qs 1. Which is only a physical change? souring or milk melting of ice burning of oil rusting of iron 2.Which process involves a chemical change? Photosynthesis freezing water boiling water melting ice 3. In the making an omelet, which process involves a chemical change? melting butter frying eggs chopping onions stirring eggs

4 LEQ #8: How are chemical reactions represented in writing?

5 LEQ #9: What can we do to increase the rate of a reaction?

6 KEY VOCAB C HEMICAL E QUATIONS : how scientists represent chemical reactions 6 CO 2 + 6 H 2 O  C 6 H 12 O 6 + 6 O 2 This is a really confusing and stupid way of doing things because what normal person has any idea what this means? LUCKILY… You’re not normal, you’re chemistry students! So let’s break it down…

7 Research 6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 Reactants Chemical Reaction Products Coefficient Subscript

8 KEY VOCAB Reactants: substances that take part in a chemical reaction  What goes in Products: substances made during a chemical reaction  What comes out + =

9 KEY VOCAB Coefficient: # of molecules of a compound in a chemical reaction – Ex: 6 H = 6 molecules of Hydrogen Subscript: # of atoms of an element in a compound – Ex: H 2 O = 2 atoms of Hydrogen in 1 molecule of water ** REMEMBER – ATOMS MAKE UP MOLECULES **

10 PRACTICE 2 H 2 0 2  2 H 2 0 + O 2 1.Reactants? 2.Products? 3.How many molecules of H 2 0 are in the products? 4.How many atoms of Hydrogen are in H 2 0 2 ? 5.How many atoms of Hydrogen are in the Reactants?

11 PRACTICE C 3 H 8 + 5 O 2  4 H 2 O + 3 CO 2 1.Reactants? 2.Products? 3.How many molecules of H 2 0 are in the products? 4.How many atoms of Hydrogen are in C 3 H 8 ? 5.How many atoms of Hydrogen are in the Reactants?

12 PRACTICE – WORK TOGETHER 4Al + 3 O 2  2 Al 2 O 3 1.Reactants? 2.Products? 3.How many molecules of Al 2 0 3 are in the products? 4.How many atoms of Oxygen are in O 2 ? 5.How many atoms of Oxygen are in the Reactants?

13 PRACTICE – ON YOUR OWN 6 CO 2 + 6 H 2 O  C 6 H 12 O 6 + 6 O 2 1.Reactants? 2.Products? 3.How many molecules of C0 2 are in the reactants? 4.How many atoms of Hydrogen are in H 2 0? 5.How many atoms of Hydrogen are in the Reactants?

14 What in the world is a precipitate? http://www.youtube.com/watch?v=8RmVwz2 fNGc (shorter) http://www.youtube.com/watch?v=8RmVwz2 fNGc OR http://www.youtube.com/watch?v=JAeOP2Mf rDY&feature=related (longer) http://www.youtube.com/watch?v=JAeOP2Mf rDY&feature=related

15 Finding the main idea and supporting details! (20 min. 4 min/paragraph) Read the article about reaction rates. For each paragraph, write down the main idea and 2 supporting details 1 reader and 1 recorder Reader reads aloud Recorder writes down the main idea and supporting details Switch for each paragraph

16 Factors that affect the RATE of a chemical change Rate—how quickly something happens

17 Factors that affect the RATE of chemical change Temperature Surface area Concentration


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