DESCRIBING CHEMICAL REACTIONS

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Presentation transcript:

DESCRIBING CHEMICAL REACTIONS

CHEMICAL REACTIONS One or more substances changes into different substances.

CHEMICAL REACTION EQUATIONS Word Equations: Names of chemicals are written out in full. Chemical Equations: Chemical formulas are used to represent the chemicals.

PARTS OF REACTION EQUATIONS Reactants: Substances that are used up during a reaction. Potassium

PARTS OF REACTION EQUATIONS Products: Substances that are produced during the reaction. Potassium and Water!

CHEMICAL REACTION RESULTS Chemical reactions can either absorb or release energy. included in equation.

CHEMICAL EQUATIONS Reactants Yields Products ? + ? ?

iron + sulfur iron (II) sulfide + energy EQUATIONS Word Equation: iron + sulfur iron (II) sulfide + energy Chemical Equation: Fe + S FeS + energy

EQUATION GUIDELINES An arrow indicates the direction of the chemical reaction. Substances on the left are reactants. Substances on the right are products. Usually very difficult to have the reaction proceed the other way

EQUATION GUIDELINES State Symbols: Indicates the state or form of each substance Ex. (s) means solid (g) means gaseous (aq) means dissolved in water

EXAMPLES Zinc + copper sulfate zinc sulfate + copper + energy Zn(s) + CuSO4(aq) ZnSO4 (aq) + Cu(s) + energy

VOCABULARY Chemical reaction Word equation Chemical equation Reactants Products State Symbols

Pg 227 # 1-9