Chapter 5 Chemical Quantities and Reactions 5.5 Types of Reactions

Homework due for Wed 2 6 2013 Red problems in blue box at end of section 5.5, classifying reactions

Type of Reactions Chemical reactions can be classified as combination reactions. decomposition reactions. single replacement reactions. double replacement reactions.

Combination In a combination reaction, two or more elements form one product. or simple compounds combine to form one product. + 2Mg(s) + O2(g) 2MgO(s) 2Na(s) + Cl2(g) 2NaCl(s) SO3(g) + H2O(l) H2SO4(aq) A B

Formation of MgO Copyright © 2009 by Pearson Education, Inc.

Decomposition In a decomposition reaction, one substance splits into two or more simpler substances. 2HgO(s) 2Hg(l) + O2(g) 2KClO3(s) 2KCl(s) + 3 O2(g)

Decomposition of HgO Copyright © 2009 by Pearson Education, Inc.

Learning Check Classify the following reactions as 1) combination or 2) decomposition. ___A. H2(g) + Br2(g) 2HBr(l) ___B. Al2(CO3)3(s) Al2O3(s) + 3CO2(g) ___C. 4Al(s) + 3C(s) Al4C3(s)

Solution Classify the following reactions as 1) combination or 2) decomposition. 1 A. H2(g) + Br2(g) 2HBr(l) 2 B. Al2(CO3)3(s) Al2O3(s) + 3CO2(g) 1 C. 4Al(s) + 3C(s) Al4C3(s)

Single Replacement In a single replacement reaction, one element takes the place of a different element in another reacting compound. Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g) Fe(s) + CuSO4(aq) FeSO4(aq) + Cu(s)

Zn and HCl is a Single Replacement Reaction Copyright © 2009 by Pearson Education, Inc.

Double Replacement In a double replacement, two elements in the reactants exchange places. AgNO3(aq) + NaCl(aq) AgCl(s) + NaNO3(aq) ZnS(s) + 2HCl(aq) ZnCl2(aq) + H2S(g)

Example of a Double Replacement Copyright © 2009 by Pearson Education, Inc.

Learning Check Classify the following reactions as 1) single replacement or 2) double replacement. A. 2Al(s) + 3H2SO4(aq) Al2(SO4)3(s) + 3H2(g) B. Na2SO4(aq) + 2AgNO3(aq) Ag2SO4(s) + 2NaNO3(aq) C. 3C(s) + Fe2O3(s) 2Fe(s) + 3CO(g)

Solution Classify the following reactions as 1) single replacement or 2) double replacement. 1 A. 2Al(s) + 3H2SO4(aq) Al2(SO4)3(s) + 3H2(g) 2 B. Na2SO4(aq) + 2AgNO3(aq) Ag2SO4(s) + 2NaNO3(aq) 1 C. 3C(s) + Fe2O3(s) 2Fe(s) + 3CO(g)

Learning Check Identify each reaction as 1) combination, 2) decomposition, 3) single replacement, or 4) double replacement. A. 3Ba(s) + N2(g) Ba3N2(s) B. 2Ag(s) + H2S(aq) Ag2S(s) + H2(g) C. SiO2(s) + 4HF(aq) SiF4(s) + 2H2O(l) D. PbCl2(aq) + K2SO4(aq) 2KCl(aq) + PbSO4(s) E. K2CO3(s) K2O(aq) + CO2(g)

Solution 1 A. 3Ba(s) + N2(g) Ba3N2(s) 3 B. 2Ag(s) + H2S(aq) Ag2S(s) + H2(g) 4 C. SiO2(s) + 4HF(aq) SiF4(s) + 2H2O(l) 4 D. PbCl2(aq) + K2SO4(aq) 2KCl(aq) +PbSO4(s) 2 E. K2CO3(s) K2O(aq) + CO2(g)

Learning Check Each of the following reactions occur in the formation of smog or acid rain. Identify the type of reaction and balance each. A. NO(g) + O2(g) NO2(s) B. N2(g) + O2(g) NO(g) C. SO2(g) + O2(g) SO3(g) D. NO2(g) NO(g) + O(g)

Solution Each of the following reactions occur in the formation of smog or acid rain. Identify the type of reaction and balance each. Combination A. 2NO(g) + O2(g) 2NO2(s) B. N2(g) + O2(g) 2NO(g) C. 2SO2(g) + O2(g) 2SO3(g) Decomposition D. NO2(g) NO(g) + O(g)

Websites for more practice http://misterguch.brinkster.net/6typesofchemicalrxn.html http://www.ehow.com/how_8251598_classify-analyze-chemical-reactions.html Then use extra practice worksheet PRA020 on MS word

Classwork for 2 6 2013 Lab to view types of reactions, then lesson to try to predict products http://misterguch.brinkster.net/pra_equationworksheets.html Fun with predicting reaction products worksheets