Section 6.1
Chemical Equations
•Chemists use statements called equationsto represent chemical reactions.
•Descriptions and observations are notenough to detail chemical reactions
Section 6.1
Chemical Equations (cont.)
•Word equations are the simplest way toexpress chemical reactions in words
•Each reactant is separated by a plus (+) sign
•Each product is separated by a plus (+) sign
•Reactants and products are separated fromeach other by an arrow ( )
Section 6.1
Chemical Equations (cont.)
•Basic Format:
Reactant 1 + Reactant 2 Product 1 + Product 2
•Example:
Vinegar + baking soda sodium acetate +water+ carbon dioxide
Section 6.1
Chemical Equations (cont.)
•Scientific names can also be used
•Example:
acetic acid + sodium hydrogen carbonate →sodium acetate + water + carbon dioxide
Section 6.1
Chemical Equations (cont.)
•Chemical equations use symbols andformulas to represent the reactants andproducts.
•This tells you exactly what reacted, and whatwas formed.
•Example:
HC2H3O2 + NaHCO3 → NaC2H3O2 + H2O + CO2
Section 6.1
Chemical Equations (cont.)
•Symbols for states of matter:
•(s) solid
•(l) liquid
•(g) gas
•(aq) aqueous [in water solution]
Section 6.1
Chemical Equations (cont.)
•The state of matter directly follows theformula it describes.
•Example:
HC2H3O2 (aq) + NaHCO3 (s) → NaC2H3O2 (aq)+ H2O (l) + CO2 (g)
Section 6.1
Examples of Chemical Equations
•Na (s) + H2O (l) NaOH (aq) + H2 (g)
•What are the reactants?
Na and H2O
•What are the products?
NaOH and H2