Molar masses are always in gram units.
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1 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P1 We need for moles of chemical because atoms, molecules, and ions are extremely tiny particles with very small masses. Mole: Mole is the SI unit for the amount of a chemical substance. 1 mole represents 6.02x10 23 of anything. Exactly 12 g of 12 C contains 6.02x10 23 carbon atoms. Notes: A dozen stands for the number 12 A mole stands for the number 6.02x10 23 The mass of 1 mole of any chemical is called the molar mass. Molar masses are always in gram units.
2 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P2 Reactions and Equations Reactants Products Low of conservation of mass: In chemical change, mass is neither created nor destroyed. H 2 (g) + O 2 (g) H 2 O (g) State symbols: (s) solid, (l) liquid, (g) gas, (aq) aqueous H 2 (g) + O 2 (g) 2H 2 O (g)
3 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P3 2H 2 (g) + O 2 (g) 2H 2 O (g) ********************************************* Interpreting Chemical Equations: Meaning on the particulate level: 2H 2 (g) + O 2 (g) 2H 2 O (g) 2 molecules 1 molecule 2 molecules 2 moles 1 mole 2 moles meaning on the macroscopic level: mass = mole x molar mass 2H 2 (g) + O 2 (g) 2H 2 O (g) 2 x x x g 32 g 36g
4 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P4 EXAMPLES OF CHEMICAL CHANGES: Chemical reactions, also called chemical changes, are not limited to happening in a chemistry lab. Here are some examples of chemical reactions with the corresponding chemical equations: A silver spoon tarnishes. The silver reacts with sulfur in the air to make silver sulfide, the black material we call tarnish. Ag + S Ag 2 S 2 Ag + S Ag 2 S An iron bar rusts. The iron reacts with oxygen in the air to make rust. Fe + O 2 Fe 2 O 3 4 Fe + 3 O 2 2 Fe 2 O 3 Methane combines with oxygen in the air to make carbon dioxide and water vapor. CH 4 + O 2 CO2 + H 2 O
5 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P5 CH O 2 CO2 + 2 H 2 O An antacid (calcium hydroxide) neutralizes stomach acid (hydrochloric acid). Ca (OH) 2 + HCl CaCl 2 + H 2 O Ca (OH) HCl CaCl H 2 O Glucose (simple sugar) ferments to ethyl alcohol and carbon dioxide. The sugar in grapes or from grain ferments with yeast to make the alcohol and carbon dioxide. The carbon dioxide is the gas that bubbles out of beer or Champaign. C 6 H 12 O 6 2 C 2 H 5 OH + 2 CO 2 Glucose ethyl alcohol + carbon dioxide Alcohol plus oxygen becomes vinegar and a molecule of water. As in the fermentation of glucose, this is a more complex reaction than it appears here because it is a biochemical reaction. C 2 H 5 OH + O 2 HC 2 H 3 O 2 + H 2 O
6 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P6 Identifying six different kinds of chemical reactions: Combination Reactions: Also called Synthesis, Combination, Construction, or Composition Reactions. A synthesis reaction might be symbolized: A + B AB Example: H 2 + O 2 2H 2 O Sulfur trioxide reacts with water to make sulfuric acid. H 2 O (l) + SO 3 (g) H 2 SO 4 (aq) Charcoal: C (s) + O 2 (g) CO 2 (g) Decomposition Reactions Also call Desynthesis Reactions A single reactant comes apart into two or more products, symbolized by: XZ X + Z 2H 2 O (l) 2H 2 (g) + O 2 (g)
7 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P7 CaCO 3 (s) CaO (s) + CO 2 (g) Lime stone lime Heating sodium bicarbonate releases water and carbon dioxide and sodium carbonate. 6 NaHCO 3 3 Na 2 CO H 2 O + 3 CO 2 III. Complete oxidation or burning of organic compounds: Petroleum products, alcohols, sugars,.. react with oxygen (burn in air). CH 4 (g) + O 2 (g) CO 2 (g) + H 2 O (g) + energy CH 4 (g) + 2O 2 (g) CO 2 (g) + 2H 2 O (g) + energy C 2 H 5 OH (l) + O 2 (g) CO 2 (g) + H 2 O (l) C 2 H 5 OH (l) + 3O 2 (g) 2CO 2 (g) + 3H 2 O (l) + energy
8 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P8 Do this example: Let s try burning isopropyl alcohol, C 3 H 7 OH: Identifying six different kinds of chemical reactions: I. Combination Reactions Symbolized by: A + B AB II. III. Decomposition Reactions Symbolized by: AB A + B Complete oxidation or burning of organic compounds Burning isopropyl alcohol, C 3 H 7 OH?! C 3 H 7 OH + O 2 CO 2 + H 2 O First take care of the carbon and hydrogen. C 3 H 7 OH + O 2 3 CO H 2 O An oxygen problem! Multiply the whole equation (except oxygen) by two. 2C 3 H 7 OH + O 2 6 CO H 2 O Now the number nine fits in the oxygen coefficient 2C 3 H 7 OH + 9 O 2 6 CO H 2 O IV. Single-Replacement (Redox) Reactions Symbolized by: A + BX AX + B
9 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P9 V. Double-Replacement Precipitation Reactions Symbolized by: AX + BY AY + BX VI. Double-Replacement Neutralization Reactions Acid + Base Salt + Water Write the formula for each material, balance it and tell what type of reaction it is. 1. Sulfur trioxide and water combine to make sulfuric acid. 2. Lead (II) nitrate and sodium iodide react to make lead iodide and sodium nitrate. 3. Calcium fluoride and sulfuric acid make calcium sulfate and hydrogen fluoride (Hydrofluoric acid). 4. Calcium carbonate will come apart when you heat it to leave calcium oxide and carbon dioxide. 5. Ammonia gas when it is pressed into water will make ammonium hydroxide. 6. Sodium hydroxide neutralizes carbonic acid. 7. Lithium oxide and water make lithium hydroxide. 8. Aluminum hydroxide and sulfuric acid neutralize to make water and aluminum sulfate.
10 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P10 9. Sulfur burns in oxygen to make sulfur dioxide. 10. Barium hydroxide and sulfuric acid make water and barium sulfate. 11. Aluminum sulfate and calcium hydroxide become aluminum hydroxide and calcium sulfate. 12. Copper metal and silver nitrate react to form silver metal and copper (II) nitrate. 13. Sodium metal and chlorine react to make sodium chloride. 14. Phosphoric acid plus sodium hydroxide. 15. Propane burns (with oxygen). 16. Zinc and copper (II) sulfate yield zinc sulfate and copper metal.
11 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P Sulfuric acid reacts with zinc. 18. Chlorine gas and sodium bromide yield sodium chloride and bromine.
12 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P12 ANSWERS TO EQUATIONS 1. SO3 + H2O H2SO4 Combination. 2. Pb(NO 3 ) 2 + 2NaI PbI 2 + 2NaNO 3 Double-Reaction-Precipitation 3. CaF 2 + H 2 SO 4 CaSO HF D-R-Precip. 4. CaCO 3 CaO + CO 2 Decomposition 5. NH 3 + H 2 O NH 4 OH Comb NaOH + H 2 CO3 Na 2 CO H 2 O Neutralization 7. Li 2 O + H 2 O 2 LiOH Comb Al(OH) H 2 SO 4 6 H 2 O + Al 2 (SO4) 3 Neut. 9. S + O2 SO 2 Comb. 10. Ba(OH) 2 + H 2 SO 4 2 H 2 O + BaSO 4 Neut. 11. Al 2 (SO4) Ca(OH) 2 2 Al(OH) CaSO 4 D-Reac-Precip. 12. Cu + 2AgNO 3 2Ag + Cu(NO 3 ) 2 (CATIONIC) Single-Replacement 13. 2Na + Cl2 2 NaCl Comb. 14. H 3 (PO 4 ) + 3 NaOH Na 3 PO H 2 O Neut. 15. C 3 H O 2 4 H 2 O + 3 CO 2 Burning 16. Zn + CuSO 4 ZnSO 4 + Cu (CATIONIC) S-Replac. 17. H 2 SO 4 + Zn ZnSO 4 + H 2 (CATIONIC) S-Replac. 18. Cl NaBr 2 NaCl + Br 2 (ANIONIC) S-Replac
13 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P13 CaCl 2 AgNO 3 AgCl Formation of an insoluble compound or a gas product is referred to as a driving force for a reaction.
14 SCC-CH110/UCD-CH41C Chapter: 8 Instructor: J.T. P14 H 2 SO 4 HCl (g) NaCl (s)
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