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Chemistry 11.2

Chemistry 11.2. “Types of Chemical Reactions”. I. Classifying Reactions. A. Combination Reaction 1. Def – 2 or more substances combine to form a single substance 2. Ex: 2 K (s) + Cl 2 (g)  2 KCl (s) 3. Demo – Magnesium + Oxygen -Why is this a combination reaction?.

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Chemistry 11.2

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  1. Chemistry11.2 “Types of Chemical Reactions”

  2. I. Classifying Reactions A. Combination Reaction 1. Def – 2 or more substances combine to form a single substance 2. Ex: 2 K (s) + Cl2 (g)  2 KCl (s) 3. Demo – Magnesium + Oxygen -Why is this a combination reaction?

  3. B. Decomposition Reaction 1. Def – a single compound is broken down into smaller products. 2. Ex: Pg. 215 2 HgO (s)  2 Hg (l) + O2 (g) 3. Dynamite 2 C7H5N3O6 (s)  7 CO (g) + 3 N2 (g) + 5 H2O (g) + 7 C (s) *For every 2 moles of dynamite, 15 moles of hot expanding gases are produced*

  4. C. Single Replacement Reactions 1. Def – One element replaces another element in a compound. 2. Ex: 2 K (s) + 2 H2O (l)  2 KOH (aq) + H2 (g) 3. Demo – I am going to add a small piece of magnesium to hydrochloric acid. The products produced is hydrogen gas and magnesium chloride. -Write the word equation -Balance the equation -Explain why this is a single replacement reaction

  5. 4. Activity Series of Metals *For any replacement reaction, the replacing metal must be higher on the list than the one it is replacing *I will give you this* Decreasing Reactivity

  6. 5. Ex: Will these reactions occur? Ag + LiOH Al + Pb(NO3)2 Li + CuCl2 Na + H2O No Yes Yes Yes

  7. D. Double Replacement Reactions 1. Def – involves an exchange of positive and negative ions between two reacting compounds. 2. Forms 3 possible compounds… -forms a precipitate (s) (AgNO3 + NaCl) -forms a gas (g) (HCl + Mg) -forms water (l) NaOH + HCl) *Pg. 334*

  8. E. Combustion Reaction 1. Def – an element or compound that reacts with oxygen producing energy and light. 2. Ex: 2 Mg (s) + O2 (g) 2 MgO 3. Lighting a bunson burner… CH4 (g) + 2 O2 (g)  CO2 (g) + 2 H2O (g)

  9. 4. Steel Wool Demo -Mass b/4 burning -Mass after burning -Why are they different? -Write the word equation -Write a balanced chemical equation -What type of reaction is this?

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