Jan 12 Chemistry

Jan 12 Chemistry

WELCOME!! 1. Welcome. Please come in and sit in your seat. Then wait for further instructions. 2. On your Catalyst sheet you should be on January 21st. CATALYST 5

MINUTES List the 5 types of chemical reactions and be able to give the basic equations for 4 of the 5. CATALYST 4 MINUTES List the 5 types of

chemical reactions and be able to give the basic equations for 4 of the 5. CATALYST 3 MINUTES List the 5 types of chemical reactions and be able to give

the basic equations for 4 of the 5. CATALYST 2 MINUTES List the 5 types of chemical reactions and be able to give the basic equations for 4 of the 5.

CATALYST 1 MINUTE List the 5 types of chemical reactions and be able to give the basic equations for 4 of the 5. TIMES UP!!!!!

Answer to Catalyst List the 5 types of chemical reactions and be able to give the basic equations for 4 of the 5. Synthesis: AB> A + B Decomposition: AB > A + B Single Replacement: AB + C > AC + B

Double Replacement: AB + CD > AD + CB Combustion AGENDA Catalyst Notes-Demos Exit Ticket ANNOUCEMENTS 1.

2. Quiz Friday If your name is on the board you may not participate in labs until youve taken the test and/or had your contract signed. TODAYS

OBJECTIVE Youll identify the types of chemical reactions. Chemical Reactions Types of Reactions

There are five types of chemical reactions we will talk about: 1. Synthesis reactions 2. Decomposition reactions 3. Single displacement reactions 4. Double Displacement reactions 5. Combustion reactions

You need to be able to identify the type of reaction. 1. Synthesis reactions Synthesis reactions occur when two substances (generally elements) combine and form a

compound. (Sometimes these are called combination reactions.) General Format: reactant + reactant 1 product Basically: A + B AB Example: 2H2 + O2 2H2O Example: C + O2 CO2 Analogy assembling a puzzle Synthesis Reactions

Here is another example of a synthesis reaction Synthesis Reactions Here is another example of a synthesis reaction Zn plus sulfur 2 min Zn + S _ZnS_____ZnS_ZnS______ZnS______ZnS______ZnS______ZnS_____ Practice-- Use the bottom of

page 1 Predict the product. Sodium metal reacts with chlorine gas Na(s) + Cl2(g) 2. Decomposition Reactions

Decomposition reactions occur when a compound breaks up into the elements or into a few simpler compounds

General Format : 1 Reactant Product + Product In general: AB A + B Example: 2 H2O 2H2 + O2 Example: 2 KClO3 2KCl + 3O2 Decomposition Reactions Another view of a decomposition

reaction: Decomposition Reactions Another example of a decomposition reaction: screaming cheeto KClO Carbohydrate CHO ---- _ZnS______ZnS______ZnS______ZnS______ZnS______ZnS______ZnS______ZnS______ZnS_____+ _ZnS______ZnS______ZnS______ZnS______ZnS______ZnS_____

3 3. Single Replacement Reactions Single Replacement Reactions occur when one element replaces another in a compound. A metal can replace a metal (+) OR a nonmetal can replace a nonmetal (-).

General Format : element + compound new element and new compound A + BC AC + B (if A is a metal) OR A + BC BA + C (if A is a nonmetal) Single Replacement Reactions

Another view: Single Replacement Reactions Zinc metal reacts with aqueous hydrochloric acid Zn2(s) + HCl(aq) ZnCl2 + H2(g) Note: Zinc replaces the hydrogen ion in the reaction

Sodium chloride solid reacts with fluorine gas NaCl(s) + F2(g) NaF(s) + Single Replacement Reactions N a reacts with water (HOH) Na + H2O _ZnS_____H2_ZnS______ZnS______ZnS______ZnS_____ + _ZnS______ZnS_____Na2O_ZnS______ZnS______ZnS______ZnS______ZnS_____ sodium with water in pond :40

4. Double Replacement Reactions Double Replacement Reactions occur when a metal replaces a metal in a compound and a nonmetal replaces a nonmetal in a compound General Format : Compound + compound new compound + new compound AB + CD AD + CB

Double Replacement Reactions Think about it like foiling in algebra, first and last ions go together + inside ions go together Example: AgNO3(aq) + NaCl(s) AgCl(s) + NaNO3(aq)

Another example: K2SO4(aq) + Ba(NO3)2(aq) 2 KNO3(aq) + BaSO4(s) 5. Combustion Reactions (BURNING) This is also called

burning!!! In order to burn something you need the 3 things in the fire triangle: 1) A Fuel (hydrocarbon) 2) Oxygen to burn it with 3) Something to ignite the reaction (spark) Combustion Reactions

In general: CxHy + O2 CO2 + H2O Hydrocarbon plus oxygen Products in combustion are ALWAYS carbon dioxide and water. (although incomplete

burning does cause some by-products like carbon monoxide) Combustion Reactions Edgar Allen Poes drooping eyes and mouth are potential signs of CO poisoning.

Combustion Example: propane burning C3H85 + O32 CO H2O 2+ 4

Demo: methane can explosion CH4 + _ZnS______ZnS_____2O2_ZnS______ZnS______ZnS______ZnS______ZnS_____ _ZnS_____CO2_ZnS______ZnS______ZnS______ZnS_____ + _ZnS______ZnS______ZnS_____2H2O_ZnS______ZnS______ZnS_____

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