Catalyst – February 4(7), 2011
Monday Mystery Element
1. Named after Etruscan god Tinia
2. Used to make mirrors
3. p-block element
Sit where you like, but make sure you can stay focused and see the
board!
Catalyst – February 4(7), 2011
Monday Mystery Element
1. Named after Etruscan god Tinia
2. Used to make mirrors
3. p-block element
TIN!
Today’s Agenda
Catalyst Chemistry Prom Begins! Intro to Unit 4 – Chemical
Reactions! Practice Time! Exit Question
HW: Page 1 of Chemistry Prom Scrapbook
Today’s Objectives
SWBAT interpret chemical equations.
SWBAT write skeleton (formula) and word equations to describe chemical reactions.
What to Expect at Chemistry Prom
Learn how to interpret and write chemical reactions
Learn about 5 types of chemical reactions
Show off your chemical dance moves Crown a Chemistry Prom King and
Queen from each class Remember Chemistry Prom with a
Scrapbook! Host a Special Chemistry Prom Guest
on Friday!!!
Chemistry Prom King and Queen Eligibility Requirements
Must be present 4/5 daysMust complete all homeworkMust complete all classworkMust dance at least once
STAY FOCUSEDNO SLEEPING, CELL PHONES,
DISRUPTION, ETC!
Do you know what a chemical reaction is????
Key Point #1: A chemical reaction is a process involving one or more substances changing into NEW SUBSTANCES.
DANCE FLOOR TIME!Chemical Reaction: YES or NO?1. Milk going sour2. Cutting a piece of paper3. Eggs rotting4. Baking soda and vinegar mixing to
produce carbon dioxide5. Crushing an aluminum can before
recycling it6. Recycling an aluminum can7. Mg + O2 MgO
Chemical Equations!
Key Point #2: We use CHEMICAL EQUATIONS to show what happens in chemical reactions.C3H8 + O2 CO2 + H20
Chemical Equations
Chemical equations are similar to algebraic equations in that the total number of atoms of each element must be equal on each side
A mathematical equation: x + 2x = 3x
A chemical equation:C3H8 + O2 CO2 + H20
Parts of a Chemical Equation
Key Point #3: A chemical equation identifies the starting chemicals as REACTANTS and the finishing chemicals as PRODUCTS.
Reactants ProductsExample (combustion of propane)
C3H8 + O2 CO2 + H20
3 Types of Chemical Equations
There are 3 ways to write chemical
equations:1. Word Equations2. Skeleton Equations
3. Balanced Equations
Phase Notations
There are 4 phase notations used in
equations:1. Solid (s)2. Liquid (l)3. Gas (g)4. In water/Aqueous
(aq)
Parts of Chemical Equations
Reactants ProductsC3H8 + 5 O2 3 CO2 + 4
H20
When you see
“yields” or “produces
” or “forms,” use an
arrow ()
When you see
“reacts with” or
“and,” use a plus sign
(+)
Word Equations
Key Point #4: Word equations use WORDS to show chemical reactions.
Solid iron and chlorine gas react to form solid iron(III)
chlorideIt’s like a short “chemical sentence” describing a chemical reaction!
Skeleton Equations
Key Point #5: Skeleton equations use CHEMICAL FORMULAS rather than words to identify products and reactants.
Word Skeleton Examples
1. Write the skeleton equation from the following word equation:Solid iron and chlorine gas react to form solid iron(III) chloride.
Just replace all names with formulas!
Don’t forget phase notations!
Write the skeleton equation…
Solid iron and chlorine gas react to form solid iron(III) chloride.
Metals: Just write the element symbol Diatomics: Molecules with 2 atoms of the
same element Start at 7, make a 7, don’t forget the “H!”
Skeleton Equation:Fe (s) + Cl2 (g) FeCl3 (s)
Skeleton Equations – Examples
Write skeleton equations for the following word equations:
1.Solid magnesium and chlorine gas react to form solid magnesium chloride.
2.The reaction of hydrogen gas and bromine gas yields hydrogen bromide gas.
3.Aqueous sodium hydroxide reacts with aqueous hydrogen chloride to produce aqueous sodium chloride and liquid dihydrogen monoxide.
Skeleton Equations – Your Turn!
Write the skeleton equations for the following word equations:
1. Hydrogen gas reacts with iodine gas to yield gaseous hydrogen iodide.
2. Gaseous carbon monoxide reacts with oxygen gas to produce carbon dioxide gas.
3.Solid potassium chlorate (chlorate = ClO3
1-) yields solid potassium chloride and oxygen gas.
TURN IN CLASSWORK TO FOLDER
HW Part ONE
Create Page 1 of your Chemistry Prom Scrapbook
BE CREATIVE!!!! It should include ALL of the following:
Definition of a chemical reaction Describe what (s), (l), (g), and (aq) mean in
a chemical reaction Three reaction stories in WORD FORMAT
AND SKELETON EQUATION FORMAT
Exit QuestionHW: PAGE 1 OF PROM SCRAPBOOK!
1. What is written on the LEFT side of the arrow in a chemical equation: PRODUCTS or REACTANTS?
2. Which of the following is a correctly written SKELETON EQUATION for the reaction between solid lithium and oxygen gas, producing lithium oxide?
A) Li + O LiOB) Li + O2 Li2O
C) Li (s) + O2 (g) Li2O (s)
D) LiO Li + O
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