3/26/12 - Bellringers

• What is happening in this chemical reaction?

Turn in bellringersif absent Friday!

23.3 – Classifying Chemical Reactions

Combustion Reaction

• Type of synthesis reaction that produces heat and light– Involves a carbon compound plus oxygen

gas to produce carbon dioxide and water

• EX - 2 C2H6 + 7 O2 4 CO2 + 6 H2O

• Also fits into other reaction types

Synthesis Reaction

• Two or more substances form a new substance

• A + B C• Example – hydrogen burning in

oxygen to become water

Decomposition reaction

• One substance breaks down into two or more substances

• AB A + B• Most require the use of heat, light,

or electricity

Single-Displacement Reaction

• One element replaces another one in a compound

• A + BC AC + B• D + BC BD + C

Activity Series

• In single displacement reactions, more reactive metals can replace less reactive metals

• Most reactive – lithium, potassium, sodium

• Least reactive – gold, silver, copper

Double-Displacement Reaction

• Results if a precipitate, water, or a gas forms when two ionic compounds in solution are combined

• Precipitate – insoluble compound that comes out of a solution in a DD reaction

• AB + CD AD + CB

Synthesis A + B ABNa + Cl2 NaCl

Decomposition AB A + B2NaCl 2Na + Cl2

Single-Displacement

A + BX AX + BMg + CuSO4 Cu + MgSO4

Double-displacement

AX + BY AY + BXCaCO3 + HCl CaCl2 + H2CO3

Video

• http://www.youtube.com/watch?v=i-HHvx1VC_8

In class assignment/homework…

• 23.3 Reinforcement WKT