50e5c6cce4b058681f3f0b47 Cher121 135724

Name: Charity Flosser Date: 12.17.2012

Unit: Lesson: Unit 4 Lesson 11

Classifying Reactions

Objectives:
Identify the four most common types of reactions: synthesis, decomposition, single replacement, double replacement
Predict the products of reactions
Balance chemical equations

Part I: Reaction between zinc and iodine

Watch the Video.

http://www.youtube.com/watch?v=xT9V7Y1iKYc

Observations:

Describe what happened when the water was added.

A reaction happened and the iodine exploded into a purple gas

Questions and conclusions:

1. Balance the equation, if necessary, for the reaction between zinc and iodine.

Zn + I2  ZnI2

It is balanced

2. Classify the reaction that occurred between the zinc and iodine. redox

3. What evidence was there that a reaction took place? The explosion

Part II: Decomposition of hydrogen peroxide

Watch the Video.

http://www.youtube.com/watch?v=kLagq1koOUk&feature=related

Observations:

Describe what happened to the hydrogen peroxide when the manganese dioxide was added It formed water and oxygen

Questions and conclusions:

1. The MnO2 was a catalyst and did not get used up in the reaction. Balance the equation, if necessary, for the breakdown of hydrogen peroxide.

H2O2  H2O + O2 2H2O2 -> 2H2O + O2.

2. Classify the reaction that occurred as hydrogen peroxide was broken down. Decomposition 3. What evidence was there that a reaction was taking place? There was a gas that was produced

Part III: Reaction between zinc and hydrochloric acid

Watch the Video.

http://www.youtube.com/watch?v=5p540KucRc8&feature=related

Observations:

Appearance of penny after 4 hours ___________________________

Questions and conclusions:

1. Balance the equation, if necessary, for the reaction between zinc and hydrocloric acid.

Zn + HCl  ZnCl2 + H2

2. Classify the reaction between zinc and hydrocloric acid.

3. What evidence was there to indicate that a