Catalyst – March 4(4)-1, 2010
Monday Mystery Element
1. Used in space shuttle parts
2. One of its compounds looks like a diamond
3. Its name probably originated from the Arabic word “zargun”
Pass GEE Packets
up to the front
please!
Catalyst – March 4(4)-1, 2010
Monday Mystery Element
1. Used in space shuttle parts
2. One of its compounds looks like a diamond
3. Its name probably originated from the Arabic word “zargun”
ZIRCONIUM!
Today’s Agenda
Catalyst New Groups! Intro to Unit 5 – Chemical
Reactions! Practice Time! Guest Speaker? Exit Question
Today’s Objectives
SWBAT interpret chemical equations.
SWBAT write skeleton (formula) equations from word equations.
Front Door
Projector2nd Period
Group 3
Josh T., LaRatio,
Brandi, J’Nae
Group 2
Durand, Heidi, Keiara,
Erica
Group 1
Heidi, George,
Jacob, Taylor
Group 6
Quincy, Josh D., Akiya,
Rodneisha K.
Group 4
Tierra, Johnika, Howard,
Montronique
Group 9
Lashannia, Chris, Marlon
Group 8
Sedric, Angelica,
Rodneisha O.
Group 7
Shante, Jeremiah,
Tracy, Ashley
Group 5
Angel, Annquinette,
Tyler, Johneisha
Front Door
Projector4th Period
Group 3
Selena, Katie, Chasity, Holloway
Group 2
Jamal, Kevin, Brittney, Kenisha
Group 1
Kendall, Quoc, Thuy, Jemeca
Group 6
Celeste, Arthur,
Stephen, Jarion
Group 5
Frank, Hannah, Cornell,
Darniesha
Group 4
Haley, Desmond, Treshon, Jeanette
Group 9 Group 8
Taylor, Martha,
Adam, Raven
Group 7Mankisha, Tatiyaan, Deston, Brhea
Front Door
Projector5th Period
Group 3
Brianna M., Gina, Nathan,
De’Jonel
Group 2
Chassidy, Chyna, Justin,
Mason
Group 1
Breionna H., Rikki, Carlton,
Breonne
Group 6
Aujuan, Jandolyn, Ida,
Mikell
Group 5
Tyler, Granville,
Qiana, J’Don
Group 4
Jesse, Natosha, Timberly, Jasmine
Group 9
Mario, Dominique,
James
Group 8Group 7
Desman, Felix, Paul,
Stephon
Chemical reactions are everywhere!
Let’s see what Bill Nye has
to say about them!
Do you remember what a chemical change is????
Key Point #1: A chemical change is a process involving one or more substances changing into NEW SUBSTANCES; this is also called a chemical reaction.
Chemical Equations!
Key Point #2: We use CHEMICAL EQUATIONS to show what happens in chemical reactions.C3H8 + 5 O2 3 CO2 + 4
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 + 5 O2 3 CO2 + 4 H20
Parts of a Chemical EquationKey Point #3: A chemical equation identifies the starting chemicals as REACTANTS and the finishing chemicals as PRODUCTS.
Reactants ProductsExample (combustion of propane)
C3H8 + 5 O2 3 CO2 + 4 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 chloride2. The reaction of hydrogen gas and
bromine gas yields hydrogen bromide gas
3. Aqueous sodium hydroxide reacts with aqueous hydrogen chloride to produce solid sodium chloride and aqueous 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 (ClO31-) yields
solid potassium chloride and oxygen gas.
Exit Question
1. What is written on the LEFT side of the arrow in a chemical equation?
2. Write the skeleton equation for the following. Use phase notations! Solid lithium reacts with oxygen gas to produce solid lithium oxide.
