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?

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
511 × 511 - en.wikipedia.org
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”.

5. (8th) Chapter 6-2 Cornell Notes
511 × 511 - en.wikipedia.org
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.

6. (8th) Chapter 6-2 Cornell Notes
511 × 511 - en.wikipedia.org
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.

7. (8th) Chapter 6-2 Cornell Notes
511 × 511 - en.wikipedia.org
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.