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Chemical reactions - Coggle Diagram
Chemical reactions
What is a chemical reaction?
It is the bond of one or more substance/elements (reactants) combined with another substance/element (products).
There are several different ways for two or more substances to react
Types
Synthesis
When two or more chemicals bond together to form a new substance or compound
Decomposition
Opposite of Synthesis
When one substance or compound breaks into two or more individual substances
Single Displacement
When one element knocks out another element out of a compound
Double Displacement
When two compounds switch ions with each other, creating a bond
Combustion
When oxygen combines with a substance to create a new substance
Examples of chemical reactions from the different types
Combustion
CH4 + 2O2 --> CO2 + 2H20
Methane + Dioxygen = Carbon dioxide + water
Production of energy
Single displacement
2HCl + Zn = ZnCl2 + H2
Hydrogen Chloride (2 Atoms of Hydrogen and 2 atoms of Chlorine) + One atom of Zinc = One atom of Zinc and 2 atoms of Chlorine + 2 atoms of Hydrogen
Through the process of single displacement, we can see how Hydrogen gets knocked out of the compound by Zinc
Decomposition
2H2O2 = 2H2O + O2
Here, one substance breaks down into 2 separate substances through the process of Decomposition
Example used from Chemistry Website
Double displacement
AgNO3 + NaCl --> AgCl + NaNO
Because of the exhange in ions between both reactants, this is a double displacement
Synthesis
2Na + Cl2 = 2NaCl
Here, both the elements react together to form a new compound, which is : Sodium Chloride
2 atoms of Sodium + 2 atoms of Chlorine = Sodium Chloride
Example used from Chemistry Website
Connection to the Flame Test
When some elements or compounds react to fire, the colour outcome of the flame changes based on the element which is introduced, because the energy which is emitted from the atoms since they are in an excited state, due to the high temperatures
It shows how elements react to different substances and the outcomes it produces
The Flame Test is a scientific experiment which acts as an accurate technique to help identify the relationship between chemical compounds and fire. It helps scientists understand that when metals are exposed to heavy heat, the electrons on the outermost layers get extremely excited and go into different energy levels or color spectrums, which is why colors are created when these elements or compounds get in touch with fire. It helps scientists and learners to inquire deeper into metal reactions and the Reactivity series
connected to the Reactivity Series as the purpose of it is to note the reactivity of elements to different substances.
Metal reactivity series
Reaction with water (K, Na, Ca, Mg) Reactions with acids (Al, Zn, Fe, Sn, Pb) Reactions with air (Cu, Ag, Au, Pt)