Chemical Reactions Ms Gacke Chem Catalyst Chemical Reactions

Chemical Reactions Ms. Gacke

Chem Catalyst

Chemical Reactions • Synthesis Reaction: When two substances combine and form a compound. • Reactant + Reactant 1 product A + B AB

Chem. Catalyst 4. 13. 15 • Select the chemical equation(s) that represent a synthesis and a decomposition reaction. Balance the reaction(s) you selected. – (A) Ba. Cl. O 3 Ba. Cl 2+ O 2 – (B) Fe + H 2 O Fe 3 O 4 + H 2 – (C) Na 2 SO 4 + Ca. Cl 2 Ca. SO 4 + Na. Cl – (D) N 2 + H 2 NH 3 – (E) C 2 H 6 + O 2 CO 2 + H 2 O

Practice Predict the products. Write and balance the following synthesis equations on your whiteboards 1. Na(s) + Cl 2(g) 2. Mg(s) + F 2(g) 3. Aluminum metal reacts with Fluorine gas

Decomposition Reactions • When a compound breaks down into simpler compounds or elements • 1 Reactant product + product AB A + B Catalyst: to speed up the reaction -chemical (compound name will appear over the ) -energy/heat (triangle over the )

Decomposition reactions in nature • Bombardier Beetle – Has two chemicals stored in abdomen – Hydroquinone (C 6 H 4(OH)2) & Hydrogen Peroxide (H 2 O 2) – When they react, H 2 O 2 decomposes, heat of reaction bring water near boiling point, oxygen gas builds up pressure – Hydroquinone converts into p-quinone (C 6 H 4 O 2) P-quinone – irritating to skin, eyes, and respiratory track (of humans) Video 1 Video 2

Decomp Practice • Predict the products of the following decomposition reactions • 1. KCl. O 3 ____ + ____ • 2. Mg. Cl 2 ____ + ____ • 3. Ba(Cl. O 3)2 ____ + ____

Synthesis/Decomposition Review • On your white board – Draw a picture explaining synthesis reactions that is not related to chemistry. – Draw a picture explaining decomposition reactions that is not related to chemistry

Homework • 4/13 – complete synthesis/decomposition problems • 4/14 – complete combustion reactions and remaining problems • 4/15 – entire worksheet is due, concept check in class over synthesis, decomposition, and combustion reactions

Chem. Catalyst 4/14/15 • Watch the demonstration • Answer the following question: – What evidence do you have that Mr. Hall is or is not crazy?

What are the requirements for combustion? • Reactants: • Products:

Combustion Reaction • Hydrocarbon + O 2 CO 2 + H 2 O • What is a hydrocarbon? • Common examples of hydrocarbons?

Remainder of class time to work on HW and get assistance 4/13 – complete synthesis/decomposition problems 4/14 – complete combustion reactions and remaining problems 4/15 – entire worksheet is due, concept check in class over synthesis, decomposition, and combustion reactions

Chem. Catalyst 4/16/15 • Steel wool demo • What reaction type is featured in the demo? • Create an equation for the reaction.

Single Replacement Reaction Demo – Copy into your notes! • • • Single Replacement: Demo: Aluminum and Copper (II) Chloride Indication of a chemical change: Possible Products: Balanced Reaction:

Reactants Did the reaction take place? Possible products Balanced Reaction Explanation of element reactivity Cu + Ag. NO 3 Mg + Ag. NO 3 Cu + H 2 O Mg + H 2 O Cu + HCl Mg + HCl