Holt Chemistry Chapter 8

1. Chapter 8 Describing Chemical Reactions

6. Evidence of a chemical change

7. Evidence of a chemical change

8. Evidence of a chemical change

12. Constructing a Chemical Rxn Other symbols

14. Chapter 8 The Great Balancing Act

24. Chapter 8 Reaction Types

25. The 5 Reaction Types

26. Synthesis Reactions In a synthesis reaction a single compound forms from two or more reactants. Two elements form a binary compound C + O 2  CO 2 2C + O 2  2CO Two compounds form a ternary compound CaO( s ) + H 2 O( l )  Ca(OH) 2 ( s ) CO 2 ( g ) + H 2 O( l )  H 2 CO 3 (aq )

28. Decomposition Reactions In a decomposition reaction a single compound breaks down, often with the input of energy, into two or more elements or simpler compounds. Decomposition of water electricity heat CaCO 3 ( s ) CaO( s ) + CO 2 ( g ) A metal carbonate decomposes to form a metal oxide and carbon dioxide. 2H 2 O( l ) O 2 ( g) + 2H 2 ( g )

35. Displacement Reactions In a displacement reaction a single element reacts with a compound and displaces another element from the compound. 2Al( s ) + 3CuCl 2 ( aq )  2AlCl 3 ( aq ) + 3Cu( s ) Aluminum displaces copper.

40. Combustion Reactions A combustion reaction is a reaction of a carbon based compound with oxygen. Combustion of propane C 3 H 8 + 5O 2  3CO 2 + 4H 2 O Combustion of ethanol CH 3 CH 2 OH + 3O 2  2CO 2 + 3H 2 O