Download Physical Science Chapter 6

(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.