Chemical Reactions. Demo 1 2 H 2 O 2 2 H 2 O + O 2 + Heat Reactants Products.
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Transcript of Chemical Reactions. Demo 1 2 H 2 O 2 2 H 2 O + O 2 + Heat Reactants Products.
Chemical Reactions
Demo 1
2 H2O2 2 H2O + O2 + Heat
Reactants Products
Demo 2
Methane Bubbles!CH4 + 2O2 CO2 + 2H2O + Heat
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.
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
Types of Reactions
Synthesis/CombinationDecompositionSingle DisplacementDouble DisplacementCombustion
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
Decomposition of Nitrogen triiodine
Nitrogen triiodine decomposition video
Single Replacement ReactionExploding Egg Video (Single Repl
acement)
Double ReplacementDouble Replacement Reactions Vi
deo
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
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
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
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.
1. Group Balancing!
2. Let’s review!
2. Pair Balancing
1. Motivational Video
3. Let’s Review
1. Individual Balancing
2. Let’s Review
Reminder Complete Homework practice
problems. ◦Due tomorrow!
Balancing Quiz 1st thing tomorrow!