Chemical Reactions Chemistry I Chapter 11b Chemistry I Honors Chapter 8 SAVE PAPER AND INK!!! When you print out the notes on PowerPoint, print "Handouts" instead of "Slides" in the print setup. Also, turn off the backgrounds ICP Chapter 21b (Tools>Options>Print>UNcheck "Background Printing")! Types of Reactions There are five types of chemical
reactions we will talk about: 1. 2. 3. 4. 5. Synthesis reactions _____________ reactions Single displacement reactions ________________ reactions Combustion reactions You need to be able to identify the
type of reaction and predict the product(s) Steps to Writing Reactions Some steps for doing reactions 1. 2. 3. Identify the type of reaction Predict the product(s) using the type of reaction as a model Balance it
Dont forget about the diatomic elements! (BrINClHOF) For example, Oxygen is O2 as an element. In a compound, it cant be a diatomic element because its not an element anymore, its a compound! 1. Synthesis reactions Synthesis reactions occur when two substances (generally elements) combine and form a compound. (Sometimes these are called combination or addition reactions.) reactant + reactant 1 product Basically: A + B AB
Example: 2H2 + O2 2H2O Example: C + O CO 2 2 Synthesis Reactions Here is another example of a synthesis reaction Practice
Predict the products. Write and balance the following synthesis reaction equations. Sodium metal reacts with chlorine gas Na(s) + Cl2(g) Solid Magnesium reacts with fluorine gas Mg(s) + F2(g) 2. Decomposition Reactions Decomposition reactions occur
when a compound breaks up into the elements or in a few to simpler compounds 1 Reactant Product + Product In general: AB A + B Example: 2 H O 2H + O 2 2 2 Example: 2 HgO 2Hg + O2 Decomposition Reactions
Another view of a decomposition reaction: Decomposition Exceptions Carbonates and chlorates are special case decomposition reactions that do not go to the elements. Carbonates (CO32-) decompose to carbon dioxide and a metal oxide Example:
CaCO3 CO2 + CaO Chlorates (ClO3-) decompose to oxygen gas and a metal chloride Example: There 2 Al(ClO3)3 2 AlCl3 + 9 O2 are other special cases, but we will not explore those in Chemistry I
Practice Predict the products. Then, write and balance the following decomposition reaction equations: Solid Lead (IV) oxide decomposes PbO2(s) Aluminum nitride decomposes AlN(s) Practice Identify the type of reaction for each of the following synthesis or
decomposition reactions, and write the balanced equation: Nitrogen monoxide N2(g) + O2(g) BaCO3(s) Co(s)+ S(s) (make Co be +3) NH3(g) + H2CO3(aq) NI3(s) 3. Single Replacement Reactions Single Replacement Reactions occur when one element replaces another in a
compound. A metal can replace a metal (+) OR a nonmetal can replace a nonmetal (-). element + compound element + compound A + BC AC + B (if A is a metal) OR A + BC BA + C (if A is a nonmetal) (remember the cation always goes first!) When H2O splits into ions, it splits into H+ and OH- (not H+ and O-2 !!)
Single Replacement Reactions Another view: Single Replacement Reactions Write and balance the following single replacement reaction equation: Zinc metal reacts with aqueous hydrochloric acid 2 Zn(s) + HCl(aq) ZnCl2 + H2(g)
Note: Zinc replaces the hydrogen ion in the reaction Single Replacement Reactions Sodium chloride solid reacts with fluorine gas 2 2 NaCl(s) + F2(g) NaF(s) + Cl2(g) Note that fluorine replaces chlorine in the compound Aluminum metal reacts with aqueous
copper (II) nitrate Al(s)+ Cu(NO3)2(aq) 4. Double Replacement Reactions Double Replacement Reactions occur when a metal replaces a metal in a compound and a nonmetal replaces a nonmetal in a compound Compound + compound compound+ compound AB + CD AD + CB Double Replacement Reactions Think about it like foiling in algebra, first and last ions go together + inside
ions go together Example: AgNO3(aq) + NaCl(s) AgCl(s) + NaNO3(aq) Another example: 2 K2SO4(aq) + Ba(NO3)2(aq) KNO3(aq) + BaSO4(s) Practice Predict the products. Balance the
reactions occur when a hydrocarbon reacts with oxygen gas. This is also called burning!!! In order to burn something you need the 3 things in the fire triangle: 1) A Fuel (hydrocarbon) 2) Oxygen to burn it with 3) Something to ignite Combustion Reactions
In general: CxHy + O2 CO2 + H2O Products in combustion are ALWAYS carbon dioxide and water. (although incomplete burning does cause some by-products like carbon monoxide) Combustion is used to heat homes and run automobiles (octane, as in gasoline, is C8H18)
Combustion Reactions Edgar Allen Poes drooping eyes and mouth are potential signs of CO poisoning. Combustion Example
C5H12 +8 O2 5 CO2 +6 H2O Write the products and balance the following combustion reaction: C10H22 + O2 Mixed Practice 1. State the type, predict the products, and balance the following reactions: BaCl2 + H2SO4
2. C6H12 + O2 3. Zn + CuSO4 4. Cs + Br2 5. FeCO3
Total Ionic Equations (HONORS ONLY) Once you write the molecular equation (synthesis, decomposition, etc.), you should check for reactants and products
that are soluble or insoluble. We usually assume the reaction is in water We can use a solubility table to tell us what compounds dissolve in water. If the compound is soluble (does dissolve in water), then splits the compound into its component ions If the compound is insoluble (does NOT dissolve in water), then it remains as a compound Solubility Table Solubilities Not on the Table!
Gases only slightly dissolve in water Strong acids and bases dissolve in water Hydrochloric, Hydrobromic, Hydroiodic, Nitric, Sulfuric, Perchloric Acids Group I hydroxides (should be on your chart
anyway) Water slightly dissolves in water! (H+ and OH-) For the homework SrSO4 is insoluble; BeI2 and the products are soluble There are other tables and rules that cover more compounds than your table! Total Ionic Equations Molecular Equation: K2CrO4 + Pb(NO3)2 PbCrO4 + 2 KNO3 Soluble Soluble
Insoluble Soluble Total Ionic Equation: 2 K+ + CrO4 -2 + Pb+2 + 2 NO3- PbCrO4 (s) + 2 K+ + 2 NO3- Net Ionic Equations These are the same as total ionic equations, but you should cancel out ions that appear on BOTH sides of the equation Total Ionic Equation: 2 K+ + CrO4 -2 + Pb+2 + 2 NO3-
PbCrO4 (s) + 2 K+ + 2 NO3Net Ionic Equation: CrO4 -2 + Pb+2 PbCrO4 (s) Net Ionic Equations Try this one! Write the molecular, total ionic, and net ionic equations for this reaction: Silver nitrate reacts with Lead (II) Chloride in hot water. Molecular: Total Ionic: Net Ionic:
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