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 Agenda

Catalyst Intro to Unit 5 – Chemical

Reaction! Practice Time! Exit Question

Today’s Objectives

SWBAT interpret chemical equations.

SWBAT write skeleton (formula) equations from word equations.

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 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

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.