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Chemical Reactions - Coggle Diagram
Chemical Reactions
How do we represent Chemical Reactions?
A chemical reaction is the rearrangement of atoms, where compounds are changed into new compounds
All chemical reactions can be represented by equations or models
Anytime an atom has re-arranged into new combinations we say a chemical reaction has occured
Word Equations
This is where we represent a chemical reaction in terms of words
To the left of the arrow is the before situation, This represents the substances we have before the reaction. They are known as the reactants
To the right of the arrow is the
after
situation, this is what we have after the reaction takes place. We call them the
products
Picture Equations
The reaction can be represented by Sub-Microscopic Diagrams
They show the reactions in pictures
Chemical Equations
We use represent the reaction in terms of the chemical formula (Symbols)
There are 3 types of numbers: Coefficients and Subscripts. The coefficients are the
big
numbers and the Subscripts are the
small
numbers
Introduction
During them materials are changed into new materials with new chemical and Physical Properties
The materials we start with are called the reactants the new materials that form are called the products
During a chemical reaction the atoms are re-arranged
Bonds are broken in the reactants to form the products
Thinking about chemical reactions
There are 3 different levels: Macroscopic - Can be observed
Microscopic- Can be observed using instruments
Submicroscopic- Cannot be observed, requires imagination to observe
A glass of water Can be Directly Observed
Atoms make up the sub-microscopic scale
Symbolicy we use H2O
Coefficients and Subscripts in chemical Equations
The numbers that are infront of the chemical formula are the Coefficients and the Numbers after it are the Subscripts
The subscripts tell us how much of an element we have
Balanced Chemical Equations
In chemical reactions mass is never lost or gained. This means that we cannot lose any atoms in a chemical reaction
In every chemical reaction we must have the same amount of atoms that we started with
