Li+, Na+, K+, NH4+ (primary rule)

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Presentation transcript:

Li+, Na+, K+, NH4+ (primary rule) Soluble Insoluble (Precipitates) Li+, Na+, K+, NH4+ (primary rule) NO3-, C2H3O2-, ClO3- Cl-, Br-, I- Ag+, Hg22+ , Pb2+ SO42- Ba2+, Ca2+, Sr2+ CO32-, O2-, PO43- H- Ba2+, Ca2+, Sr2+, Mg2+ S2- Chemistry – Mar 5, 2018 P3 Challenge – Balance this reaction, identify its type and then determine a driving force for the reaction, if it happens. (Write no reaction if there is no driving force.) _____SrBr2 + _____ (NH4)2CO3  _____SrCO3 + _____ NH4Br Today’s Objective – Predicting products Pick up three handouts Get out Activity series section and driving forces & types ID balancing page for HMK check

Chemistry – Mar 5, 2018 Objective – Predicting Products Assignment: Predicting products worksheet Agenda Homework Review Predicting Synthesis Predicting Decomposition Predicting Single Replacement Predicting Double Replacement Predicting Combustion

Predicting Products If given reactants, you should be able to predict the products. The type of reactants will tell you which type of reaction will happen. Reactants Reaction Type Products Two elements Synthesis (S) Compound of the two elements A single compound Decomposition (D) Component elements (or simpler substances) An element and a compound Single replacement (SR) Different element and compound Two compounds Double replacement (DR) Two different compounds Reaction with oxygen Combustion (C) Oxides of each element in other reactant

Predicting Synthesis Use when there are two elemental reactants there will be only one product Determine the ions each element makes. One will be a cation, the other will be an anion. If a variable charge element is involved you will need to be told what ion charge is appropriate for the product. Use the “switch drop and reduce” procedure to determine the formula of the single product.

Predicting Synthesis - Practice Recall nonmetals and nonmetal oxides react with water to form acids and metals and metal oxides react with water to form bases (hydroxides) Sometimes a simple inventory of the atoms reacting will suggest a product. Balance the reaction. Ex: (II) Ni + Cl2  Ex: N2O5 + H2O 

Predicting Decomposition Use when there is only one reactant. Decompositions follow patterns: (These patterns will be on the test) binary compound  two elements metal carbonate  metal oxide + carbon dioxide metal hydrogen carbonate  metal oxide + water + carbon dioxide metal hydroxide  metal oxide + water metal chlorate  metal chloride + oxygen metal sulfate  metal oxide + sulfur dioxide + oxygen metal nitrate  metal oxide + nitrogen dioxide + oxygen

Predicting Decomposition -Practice binary compound  two elements metal carbonate  metal oxide + carbon dioxide metal hydrogen carbonate  metal oxide + water + carbon dioxide metal hydroxide  metal oxide + water metal chlorate  metal chloride + oxygen metal sulfate  metal oxide + sulfur dioxide + oxygen metal nitrate  metal oxide + nitrogen dioxide + oxygen Name the compound that will decompose to be able to identify how it will decompose. Then follow the pattern to write the products. Balance the reaction. Ex: NaClO3  Ex: CaCO3 

Predicting Single Replacement Use when an element (usually a metal) reacts with a compound. Determine the ion formed by the free element and combine with the anion of the compound to form one product. Turn the cation (or anion) of the compound into a free element as the second product. A metal free element replaces a metal. A nonmetal free element replaces a nonmetal.

Predicting Single Replacement -Practice Check the activity series to verify the reaction happens. Ex: (II) Cu + AgNO3  Ex: Zn + CaCl2 

Predicting Double Replacement Use when two compounds are reacting. Identify the cations and anions present in the reactants. Switch partners so that each cation is with the other anion. Write your products using the “switch drop and reduce” procedure Check solubility to verify the reaction happens. Ex: CaCl2 + AgNO3  Ex: ZnSO4 + Ba(OH)2 

Predicting Combustion Use when there is oxygen as a reactant. Identify each element in the other reactant. The products formed will be oxides of each of the elements. Common Nonmetal oxides are CO2, H2O, NO2 and SO2. For metal oxides, use the “switch drop and reduce” procedure (Metal ion to use given) Ex: C3H3NO + O2  Ex: (III) FeS + O2 

Exit Slip - Homework What’s Next? (How to prepare for the next day) Exit Slip: none What’s Due? (Pending assignments to complete.) Chemical reactions Lab Prelab Due Wednesday Predicting Products Worksheet Due next Monday What’s Next? (How to prepare for the next day) Read p473, p286-288, p548-549, p280-282