Quick Write!You have 6 minutes!

Describe the 4 main types of Chemical Reactions, as demonstrated in class,

using the following components:

Peanut butter

Chocolate

Graham Cracker

Almonds

Physical Science 1-24-07 ReviewPractice

Team Work!Introduction to Balancing

Formulas

REVIEW• What are the components of a chemical

reaction?

________ + __________ _________Reactant Reactant Product

What does the arrow mean in the equation?

“Forms” , “ Produces” , or “ Yields”

REVIEW

• What type of Chemical Reaction does this photo represent?

Double Displacement Reaction

REVIEW

• How about this one?

Synthesis Reaction

REVIEW• What type of reaction does this photo

represent?

Single Displacement Reaction

REVIEW

• And the last one we modelled?

Decomposition Reaction

REVIEW

• In what type of reaction does oxygen react with a second compound producing CO2 and H2O ?

COMBUSTION Reaction

Team Work!• Please locate your team members and

quickly sit at one of the back 4 tables together.

• Team A: Sara, Christian, Carl, Justin, & Bill

• Team B: Joe, Ashlee, Courtney, & Tiffany

• Team C: James D., Brittney, Chelsey, Garrett, & Tim

• Team D: Lacy, James E., Kayla, & Brandon

Team Work!• Each team is provided with a set of 5 cards

(one for each type of reaction we have studied).• Each slide that is projected here will display a

new chemical reaction.• As a team you have 20 seconds to decide

which type of reaction it is and place that card, FACE DOWN, at the end of the table closest to the teacher.

• If you are correct, your team may talley one point on the chalk board. If you are incorrect, your team loses two points!!!!

H2 + Cl2 2HCl

Synthesis Reaction

4H2 + O2 2H2O

Synthesis Reaction

2CH4 + 3O2 2CO2 + 4H2O

Combustion Reaction

2Al + 2H2SO4 Al2(SO4 ) 2 + 2H2

Single Displacement Reaction

2Al2O3 4Al + 3O2

Decomposition Reaction

SiCl4 Si + 2Cl2Decomposition Reaction

C + 2H2 CH4

Synthesis Reaction

Zn(OH)2 ZnO + H2O

Decomposition Reaction

2KI + Cl2 2KCl+ I2

Single Displacement Reaction

Mg + 2HCl MgCl2 + H2

Single Displacement Reaction

P4 + 5O2 P4O10

Synthesis Reaction

GAME OVER!

• TALLEY UP THE POINTS EACH TEAM HAS…THE WINNING TEAM RECEIVES A PRIZE AT THE END OF CLASS.

WHAT ELSE CAN WE LEARN USING THESE REACTIONS?

C + 2H2 CH4• HOW MANY ATOMS ARE THERE ON

THE LEFT SIDE OF THE REACTION (TOTAL)?

• HOW MANY ATOMS ARE THERE ON THE RIGHT SIDE OF THE REACTION (TOTAL)?

C + 2H2 CH4• On the left side, there are ONE Carbon

atom and FOUR Hydrogen atoms. (Note: 4 Hydrogen atoms, because the Coefficient gets multiplied by the subscript). This gives us 5 total atoms.

• On the right side (products), we also see ONE Carbon atom and FOUR Hydrogen atoms, for a total of 5 atoms.

• Notice that the number of atoms of each ELEMENT stays the same on each side!

This is known as a BALANCED EQUATION!

• Over the next couple of days, we will be discovering how to balance a chemical equation by manipulating the Coefficients.

• It is important to remember that we will not change the subscript numbers in the formulas at any time. (*Few exceptions to this rule may be pointed out later to you.)

• Bring your books, your thinking caps and a writing utensil tomorrow….and find out more!!!