(2.3) CHEMICAL EQUATIONS (p144-145). Recall: Word Equation A word equation - states what reacts and what is produced - uses words instead of formulas.

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Presentation transcript:

(2.3) CHEMICAL EQUATIONS (p )

Recall: Word Equation A word equation - states what reacts and what is produced - uses words instead of formulas to describe a chemical reaction

Word Equation-Examples ex 1: magnesium + oxygen  magnesium oxide what reacts what is produced (reactants) (products)

Word Equation-Examples ex 2: zinc + hydrochloric acid  hydrogen + zinc chloride what reacts what is produced (reactants) (products)

Chemical Equation A chemical equation uses chemical symbols and formulas to represent the reactants and products in a chemical reaction

Chemical Equation From the word equation you can now write a chemical equation: ex: a) sodium chloride  sodium + chlorine (word equation) b) NaCl  Na + Cl 2 (chemical equation)

Chemical Formulas The chemical formulas of most elements are written simply as the symbol in the periodic table ex: magnesium, Mg sodium, Na  But there are some elements that contain more than one atom.  For a list, see Table 2.9 p147

Chemical Formulas Textbook p 147

CLASSWORK Copy Table 2.9 (pg. 147) into your notes pg.147 “Learning Check” # 1 - 4

HOMEWORK “Chemical Reactions and Chemical Equations” Worksheet