Chemical Reactions The fun stuff!

Indicators of Chemical Reactions 1.Color Change 2.Formation of a precipitate (two liquids form a solid) 3.Formation of a new gas (bubbling, fizzing) 4.Temperature change (without adding or taking away heat) 5.Explosions, flames, light or sound 6.Odor change 1.Color Change 2.Formation of a precipitate (two liquids form a solid) 3.Formation of a new gas (bubbling, fizzing) 4.Temperature change (without adding or taking away heat) 5.Explosions, flames, light or sound 6.Odor change

Symbols used Catalyst: a substance that causes or accelerates a chemical reaction without itself being affected. The chemical is not used in the reaction Noted above the arrow(s) Catalyst: a substance that causes or accelerates a chemical reaction without itself being affected. The chemical is not used in the reaction Noted above the arrow(s)

Heat/Delta symbol (triangle): a symbol of heat or delta above the arrow(s) indicates that heat is needed for the reaction to occur

Forward arrow: chemical reaction only processes in one direction. It cannot be reversed Double arrow: reaction is a reversible reaction and can process in either direction Forward arrow: chemical reaction only processes in one direction. It cannot be reversed Double arrow: reaction is a reversible reaction and can process in either direction

(aq): the substance is aqueous. Means the substance is dissolved in water (s or ): the substance is a solid (l): the substance is a liquid (g or ): the substance is a gas (aq): the substance is aqueous. Means the substance is dissolved in water (s or ): the substance is a solid (l): the substance is a liquid (g or ): the substance is a gas

Word equations are used to describe a reaction happening. The description should include amounts, states and chemicals. Describing equations need to include all the information that is possible to describe the reaction.

Symbolic Equation Symbolic equations are written so that a chemist can read the reaction in a short abbreviated format. Symbolic equations tell as much as a word equation does but uses only symbols.

Symbol to word equations When writing word equations: –Include all information possible States, amounts, catalyst –Tell how the reaction is happening When writing word equations: –Include all information possible States, amounts, catalyst –Tell how the reaction is happening

Word to symbol equations Make sure every word that is written is shown as a symbol –Excluding words that aren’t important like of,to,are, etc Make sure every word that is written is shown as a symbol –Excluding words that aren’t important like of,to,are, etc

Naming is still important Knowing how to name is still important. Not knowing the vocabulary of chemistry will inhibit your ability to speak the language of chemistry.