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The Language of Chemistry
Language of Chemistry Formula: A combination of symbols that shows the ratio of elements in a compound. ex: H 2 O
Chemical Equation: A short, easy way to show a chemical reaction, using symbols instead of words ex: 2Na + Cl 2 2NaCl
Subscript:A small number in a formula that tells the number of each element in a compound. ex: CO 2
Coefficient: A BIG number placed in front of a formula that tells how many atoms are involved in a reaction. ex: 2Na + Cl 2 2NaCl
Reactant:A substance that enters into a chemical reaction (what you start with). Reactant(s) Product(s) 2Na + Cl 2 2NaCl
Product:A substance formed as a result of a chemical reaction (what you produce or end with). Reactant(s) Product(s) 2Na + Cl 2 2NaCl
+:Is added to or combined with. :Yields or produces.
Warm-up Spiral Write or read over your summary for the notes on “Describing Chemical Reactions” (Pgs. 544 – 548) If you were absent, begin to write notes.
The Language of Chemistry
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The Language of Chemistry Matter, Symbols, Formulas & Chemical Equations.
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Changes of Matter Physical Change- a change that alters the appearance or form of a substance but doesn’t produce a new substance. Ex: melting a sample.
Chemical Reactions. Nature of Reactions A chemical reaction is when you create a new substance with unique physical and chemical properties.
Do Now Please write HW in your agenda. Please update your table of contents. Fold and attach the notes to page 119. Answer the entrance ticket.
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