Symbolic Language of Chemistry Evidence for Chemical Change (Check physical/chemical change worksheet) Symbolic Language of Chemistry Symbols represent…. Formulas represent… Equations represent…

Station 1: Burning Candle Chemical Equation C20H42+ O2  CO2 + H2O The equation says nothing about the existence of a flame. Reactants Products Arrow acts as an equal sign. You read it as “yields”, “makes” or “produces”

Station 2: Sodium Nitrate and Water NaNO3  Na+ + NO3- Endothermic – heat is absorbed. It gets colder Station 4: Calcium Chloride and water Water CaCl2  Ca+2 + 2 Cl- Exothermic – Heat is released it gets warmer.

Station 5: Magnesium and Hydrochloric acid Effervescence – production of tiny bubbles. Mg + 2 HCl  MgCl2 +H2 Station 7: Zinc and Hydrochloric acid Zn + 2 HCl  ZnCl2+ H2 The equation tells you nothing on how fast the reaction happens Coefficients are used to make the number of atoms in the products equal the number of atoms in the reactants.

Station 6: Potassium Iodide and Hydrogen peroxide Chemical above the arrow is a catalyst – something that lowers the energy necessary to start a reaction, but is not changed with the reaction KI 2H2O2  O2+ 2H2O

Station 3: Copper Sulfate and Barium Nitrate CuSO4 (aq)+ Ba(NO3)2(aq) Cu(NO3)2 (aq) + BaSO4(s) s = solid l = liquid g = gas aq = aqueous – in water Letters in parenthesis tell you the state of matter that the reactants and products are in. Precipitate – a solid forms that is not able to dissolve in water

Station 8 and 9 Bromothymol Blue and Carbon dioxide Bromothymol Blue and Sodium Carbonate Carbon Dioxide makes carbonic acid changing the color to yellow. Sodium carbonate neutralizes the acid making it more basic and changes the color back to blue

Station 8 and 9 Yellow Blue Bromothymol Blue and Carbon dioxide Bromothymol Blue and Sodium Carbonate Yellow Blue For some reactions it makes more sense to show the structure rather than the formula.

Chemical Equations Represent Chemical reactions Tells you the ratios of what goes in and what comes out. Can tell you the reactant and product’s state of matter Can tell you if there is a catalyst involved Cannot tell you the change in energy or the rate of the reaction.

Type of Reaction Definition Equation Synthesis (divorce) (marriage)  Two or more elements or compounds combine to make a more complex substance   ______ +______  ______ Decomposition (divorce) Compounds break down into simpler substances ______  ______ + ______    Single Displacement (Cheating) Occur when one element replaces another one in a compound ______ + ______  ______ + ______ Double Displacement (wife swap) Occurs when different atoms in two different compounds trade places Combustion Occurs when a hydrocarbon reacts with oxygen to produce water and carbon dioxide.

Classifying Reactions Addition (synthesis) - A + B  AB Marriage - 2H2 +O2  2H2O Decomposition - AB  A + B Divorce - 2H2O  2 H2 +O2 Single displacement - AB + C  AC + B Cheating Spouse - 2AlBr3 + 3Cl2  2AlCl3 + 3Br2 Double displacement – AB + CD  AD + CB Wife Swap – 2 AlBr3+ 3HgCl2 2AlCl3 +3 HgBr2 Combustion – Odd man out CxHX + O2  CO2 + H2O

What type of reaction? SeCl6 + O2  SeO2 + 3Cl2 A.) Synthesis iRespond Question Multiple Choice F SeCl6 + O2  SeO2 + 3Cl2 A.) Synthesis B.) Decomposition C.) Single Replacement D.) Double Replacement E.) Combustion

What type of reaction? H2O2  H2 + O2 A.) Synthesis B.) Decomposition iRespond Question Multiple Choice F H2O2  H2 + O2 A.) Synthesis B.) Decomposition C.) Single Replacement D.) Double Replacement E.) Combustion

What type of reaction? 2 Na + Cl2 2 NaCl A.) Synthesis iRespond Question Multiple Choice F 2 Na + Cl2 2 NaCl A.) Synthesis B.) Decomposition C.) Single Replacement D.) Double Replacement E.) Combustion

What type of reaction? Na2CO3  Na2O + CO2 A.) Synthesis iRespond Question Multiple Choice F Na2CO3  Na2O + CO2 A.) Synthesis B.) Decomposition C.) Single Replacement D.) Double Replacement E.) Combustion

What type of reaction? Pb + O2  PbO2 A.) Synthesis B.) Decomposition iRespond Question Multiple Choice F Pb + O2  PbO2 A.) Synthesis B.) Decomposition C.) Single Replacement D.) Double Replacement E.) Combustion

What type of reaction? CH4 + 2 O2  CO2 + 2 H2O A.) Synthesis iRespond Question Multiple Choice F CH4 + 2 O2  CO2 + 2 H2O A.) Synthesis B.) Decomposition C.) Single Replacement D.) Double Replacement E.) Combustion

What type of reaction? NaOH + KNO3 --> NaNO3 + KOH A.) Synthesis iRespond Question Multiple Choice F NaOH + KNO3 --> NaNO3 + KOH A.) Synthesis B.) Decomposition C.) Single Replacement D.) Double Replacement E.) Combustion

What type of reaction? Pb(NO3)2 + 2 KI  PbI2 + 2 KNO3 A.) Synthesis iRespond Question Multiple Choice F Pb(NO3)2 + 2 KI  PbI2 + 2 KNO3 A.) Synthesis B.) Decomposition C.) Single Replacement D.) Double Replacement E.) Combustion

What type of reaction? Fe + H2SO4  Fe2(SO4)3 + H2 A.) Synthesis iRespond Question Multiple Choice F Fe + H2SO4  Fe2(SO4)3 + H2 A.) Synthesis B.) Decomposition C.) Single Replacement D.) Double Replacement E.) Combustion

What type of reaction? Mg + 2 H2O  Mg(OH)2 + H2 A.) Synthesis iRespond Question Multiple Choice F Mg + 2 H2O  Mg(OH)2 + H2 A.) Synthesis B.) Decomposition C.) Single Replacement D.) Double Replacement E.) Combustion

What type of reaction? 8 Fe + S8  8 FeS A.) Synthesis iRespond Question Multiple Choice F 8 Fe + S8  8 FeS A.) Synthesis B.) Decomposition C.) Single Replacement D.) Double Replacement E.) Combustion