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4.2 From reactions to balancing equations
Chemical reactions and equations
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Slide 1:
Tekstslide
Scheikunde
Middelbare school
havo, vwo
Leerjaar 3
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13 slides
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tekstslides
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Chemical reactions and equations
Slide 1 - Tekstslide
How can you tell that a chemical reaction has taken place?
Slide 2 - Open vraag
Types of reactions
You can divide the reactions up in three broad types:
decompositions
:
one
reactant ->
multiple
reactions products
combustions:
reactant +
oxygen
-> reactions product(s)
other
reactions
:
multiple reactants -> reactions product(s)
Slide 3 - Tekstslide
What is a decomposition?
A
A reaction with oxygen
B
A reaction with one reactant and multiple reaction products
C
A combustion
D
A reaction with multiple reactants and one reaction product
Slide 4 - Quizvraag
Types of decomposition
A
elektrolysis, analysis, hydrolysis
B
thermolysis, electrolysis, photolysis
C
photolysis, thermolysis, kinelysis
D
thermolysis, luminysis, electrolysis
Slide 5 - Quizvraag
chemical reaction or chemical equation?
You can make a chemical equation out of a chemical reaction.
A chemical reaction is in words.
A chemical equation is in symbols and needs to be balanced.
Slide 6 - Tekstslide
chemical reaction
Start: methane and oxygen
End: carbondioxide and water
Slide 7 - Tekstslide
Give the chemical reaction for the decomposition of the substance aluminiumoxide (l)
Slide 8 - Open vraag
+
+
Chemical reaction of photosynthesis
glucose
water
carbondioxide
oxygen
Slide 9 - Sleepvraag
You can tell what happens with a chemical reaction, but not how many of each substance is needed or used
Slide 10 - Tekstslide
Chemical reaction to chemical equation
A
chemical equation
:
uses
formulas
to indicate which substances react with one another and which new substances form
uses the
ratio
in which the molecules react with one another and which new substances form
Slide 11 - Tekstslide
Rules for balancing equations
after the reaction each type of atom needs to have the same amount as it had before the reaction
You can't alter the molecules which you have themselves (so you can't alter the index
There are no half molecules, if you get to a half number you will have to multiply
all
of the coefficients by 2
The coefficients need to be the lowest possible whole number
Slide 12 - Tekstslide
phet.colorado.edu
Slide 13 - Link
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