Quick Write! You have 6 minutes! Describe the 4 main types of Chemical Reactions, as demonstrated in...
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Transcript of Quick Write! You have 6 minutes! Describe the 4 main types of Chemical Reactions, as demonstrated in...
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!!!