chemical reactions. demo 1 2 h 2 o 2 2 h 2 o + o 2 + heat reactants products
TRANSCRIPT
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Chemical Reactions
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Demo 1
2 H2O2 2 H2O + O2 + Heat
Reactants Products
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Demo 2
Methane Bubbles!CH4 + 2O2 CO2 + 2H2O + Heat
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What is a Chemical Reaction?
A chemical reaction- is a change in which one or more substances are converted into new substances.
An example of this would be a rusty nail. A chemical reaction between the iron in the steel and the oxygen in the atmosphere causes rust.
Other examples: lighting a match, start a car, eat dinner or even walking the dog.
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Identify the reactants and the products in the following chemical equations.
Chemical Equation Reactants Products
2 Na + S Na2S C + O2 CO2
CaO O2 + 2 Ca
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Types of Reactions
Synthesis/CombinationDecompositionSingle DisplacementDouble DisplacementCombustion
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Synthesis/CombinationOccurs when two or more
substances combine to form one substance
A + B AB
Most synthesis reactions involve two elements combining to form a compound
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Decomposition of Nitrogen triiodine
Nitrogen triiodine decomposition video
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Single Replacement ReactionExploding Egg Video (Single Repl
acement)
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Double ReplacementDouble Replacement Reactions Vi
deo
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Why is it important to balance reactions?
Conservation of MassTotal mass of products equals
total mass of reactantMass is conserved, not created or
destroyed
Law of Conservation of Mass Video
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Balancing EquationsBalancing an equation means: changing
coefficients so a chemical equation has the same number of atoms on both sides.
4Al + 3O2 2Al2O3 Coefficients are the numbers that show:
how many atoms or molecules of each substance are used or produced.
4Al + 3O2 2Al2O3
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Balancing EquationsSubscripts are numbers that show there is
more than one atom of a certain type in a molecule of a substance
Balance this equation: Fe + 02 FeO Fe O
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Steps for balancing an Equation1. Write a chemical equation using formulas
and symbols. Fe (s) + O2 FeO (s)2. Count the atoms in the reactants and
products. reactants products Fe O
3. Choose coefficients to balance the equation.
2Fe(s) + 02 2 FeO(s)
4. Check the number of atoms on each side of the equation.
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1. Group Balancing!
2. Let’s review!
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2. Pair Balancing
1. Motivational Video
3. Let’s Review
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1. Individual Balancing
2. Let’s Review
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Reminder Complete Homework practice
problems. ◦Due tomorrow!
Balancing Quiz 1st thing tomorrow!