Chemistry and Controlled Explosions

The Cardin chemistry classes are learning about chemical reactions. This is by far the favorite unit of the year. The students love to try different reactions and getting to see some controlled explosions. In class we have discussed the five types of reactions and looked at an example of each type. In synthesis reactions two or more substances react to produce a single product (A+B -> AB). In combustion reactions oxygen reacts with a substance (usually a hydrocarbon) to release energy in the form of heat and light. In a decomposition reaction a single compound breaks down into two or more elements or new compounds (AB-> A+B). A single replacement reaction involves the exchange of a metal or halogen for another element with a lower reactivity (A + BX-> AX+ B). Finally, double replacement reactions involve two anion-cation exchanges (AX + BY -> AY + BX). See if you can identify the following reactions as synthesis, combustion, decomposition, single replacement, or double replacement:

•       Ti + 2Cl2 =TiCl4

•       AgNO3 + LiI = AgI +LiNO3

•       3Mg + 2Cr(NO3)3 = 3Mg(NO3)2 + 2Cr

•       2C2H2 + 5O2= 4CO2 + 2H2O

•       2H2O2 = 2H20 + O2

Answers:

-Synthesis

-Double Replacement

-Single Replacement

-Combustion

-Decomposition

~Ms. Alexandra Sloane

Science Instructor