catalyst – november 3 2, 2009 monday mystery element 1. used in space shuttle parts 2. one of its...
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Catalyst – November 32, 2009
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”
Weekly Goal!
Catalyst – November 32, 2009
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 Objectives
SWBAT interpret chemical equations.
SWBAT write skeleton (formula) equations from word equations.
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 Equation
Key Point #3: A chemical equation identifies the starting and finishing chemicals as reactants and 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 fluorine gas to yield gaseous hydrogen fluoride.
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.
Independent Practice
Complete the following assignment on your own paper
Page 304 in your book (read 10.1): #s 53-56, 58, 71- 74
Turn in completed assignment to group folder or finish for homework
Independent Practice – HONORS Complete the following
assignment on your own paper Page 209 in your book (read 7.1-
7.2): #s 5-9, 11, 14, 15, 17, 26
Turn in completed assignment to group folder or finish for homework