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(8th) Chapter 6-2 Cornell Notes • “Observing Chemical Change” (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? (8th) Chapter 6-2 Cornell Notes • Key Terms chemical equationconservation of matteropen systemclosed systemcoefficientsynthesisdecompositionreplacement- (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”. (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; Closed system: matter can’t enter or escape (ex. in a sealed plastic bag), can measure mass reactants/products. (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; coefficients can be used to balance equations, shows # atoms or molecules of reactants/products. (8th) Chapter 6-2 Cornell Notes 3 types chemical reactions: Paragraph 4 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.