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Ch 8 - Chemical Reactions. Types of Reactions There are five types of chemical reactions we will talk about: 1. 1. Combination (or synthesis) reactions.

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Presentation on theme: "Ch 8 - Chemical Reactions. Types of Reactions There are five types of chemical reactions we will talk about: 1. 1. Combination (or synthesis) reactions."— Presentation transcript:

1 Ch 8 - Chemical Reactions

2 Types of Reactions There are five types of chemical reactions we will talk about: Combination (or synthesis) reactions Decompositition reactions Single replacement reactions Double replacement reactions Combustion reactions You need to be able to identify the type of reaction and predict the product(s)

3 1. Combination reactions Combination reactions occur when two substances (generally elements) combine and form a compound. reactant + reactant 1 product A + B AB Example: 2H 2 + O 2 2H 2 O Example: C + O 2 CO 2

4 Combination Reactions Here is another example of a combination reaction

5 Practice Complete and balance: Sodium metal reacts with chlorine gas Na (s) + Cl 2(g) Solid Magnesium reacts with fluorine gas Mg (s) + F 2(g) Aluminum metal reacts with fluorine gas Al (s) + F 2(g)

6 2. Decomposition Reactions Decomposition reactions occur when a compound breaks up into elements 1 Reactant Product + Product AB A + B Example: 2 H 2 O 2H 2 + O 2 Example: 2 HgO 2Hg + O 2

7 Decomposition Reactions Another view of a decomposition reaction:

8 Practice Complete and balance: Solid Lead (IV) oxide decomposes Aluminum nitride decomposes

9 Practice Identify the type of reaction for each of the following synthesis or decomposition reactions, and write the balanced equation: N 2(g) + O 2(g) BaCl 2(s) Co (s) + S (s) NI 3(s) (make Co be +3) Nitrogen monoxide

10 3. Single Replacement Reactions Single Replacement Reactions occur when one element replaces another in a compound. Element A + compd BC element B + Compd AC A + BC AC + B (if A is a metal) A + BC BA + C (if A is a halogen) H 2 O H + and OH - (not H+ and O -2 !!)

11 Single Replacement Reactions Another view:

12 Single Replacement Reactions Complete and balance: Zinc metal reacts with hydrochloric acid Zn (s) + HCl (aq) ZnCl 2 + H 2(g) Note: Zinc replaces the hydrogen ion in the reaction 2

13 Single Replacement Reactions Sodium chloride solid reacts with fluorine gas NaCl (s) + F 2(g) NaF (s) + Cl 2(g) Aluminum reacts with aqueous copper (II) nitrate 22

14 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 AB + CD AD + CB

15 Double Replacement Reactions Think about it like foiling in algebra, first and last ions go together + inside ions go together Example: AgNO 3(aq) + NaCl (s) AgCl (s) + NaNO 3(aq) Another example: K 2 SO 4(aq) + Ba(NO 3 ) 2(aq) KNO 3(aq) + BaSO 4(s) 2

16 Solubility Table

17 Practice Predict the products. Balance the equation HCl (aq) + AgNO 3(aq) CaCl 2(aq) + Na 3 PO 4(aq) Pb(NO 3 ) 2(aq) + BaCl 2(aq) FeCl 3(aq) + NaOH (aq) H 2 SO 4(aq) + NaOH (aq) KOH (aq) + CuSO 4(aq)

18 1. 1. CaCl 2(aq) + Na 3 PO 4(aq) Pb(NO 3 ) 2(aq) + BaCl 2(aq)

19 5. Combustion Reactions Combustion reactions occur when a hydrocarbon reacts with oxygen gas.

20 Combustion Reactions For burning hydrocarbons: C n H n+2 + O 2 CO 2 + H 2 O Products of complete combustion are ALWAYS carbon dioxide and water.

21 Combustion Reactions Edgar Allen Poes drooping eyes and mouth are potential signs of CO poisoning.

22 Combustion Example: C 5 H 12 + O 2 CO 2 + H 2 O Complete and balance: C 10 H 22 + O

23 Mixed Practice State the type, predict the products, and balance the following reactions: BaCl 2 + H 2 SO C 6 H 12 + O Zn + CuSO Cs + Br FeCl 3


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