1. (8th) Chapter 6-2 Cornell Notes “Observing Chemical Change”

2. (8th) Chapter 6-2 Cornell Notes Key Questions What information does a chemical equation contain? How is matter conserved during a chemical reaction? What must a balanced chemical equation show? What are three types of chemical reactions?

3. (8th) Chapter 6-2 Cornell Notes Key Terms chemical equation- conservation of matter- open system- closed system- coefficient- synthesis- decomposition- replacement-

4. (8th) Chapter 6-2 Cornell Notes Paragraph 1 chemical equation: easy way to show chemical reaction; uses chemical formulas, symbols; beginning substances (on the left) called reactants; ending substances (on the right) called products; arrow in the middle means “yields” or “gives”. 1.511 × 511 - en.wikipedia.org511 × 511 - en.wikipedia.org

5. (8th) Chapter 6-2 Cornell Notes Paragraph 2 in chemical reactions, #atoms remains the same and the total mass also; open system: matter can enter or escape (ex. match burning), can’t measure mass reactants/products; 1.511 × 511 - en.wikipedia.org511 × 511 - en.wikipedia.org Closed system: matter can’t enter or escape (ex. in a sealed plastic bag), can measure mass reactants/products.

6. (8th) Chapter 6-2 Cornell Notes Paragraph 3 chemical reaction same # atoms on both sides of the equation; balanced equation example of conservation of matter; 1.511 × 511 - en.wikipedia.org511 × 511 - en.wikipedia.org coefficients can be used to balance equations, shows # atoms or molecules of reactants/products.

7. (8th) Chapter 6-2 Cornell Notes Paragraph 4 3 types chemical reactions: 1.511 × 511 - en.wikipedia.org511 × 511 - en.wikipedia.org Synthesis: combine 2+ elements/compounds to make new substance; Decomposition: reactions breaks down compounds into simpler products; Replacement: element replaces another in a compound or more than one.