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Chemical reactions (Physical properties can be observed without changing…
Chemical reactions
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Physical change is a change that occurs without any change in the original molecular composition. The same compound is present before and after the change.
Chemical properties are any characteristics that can be determined by changing the molecular structure of the compound. EX: Combustibility.
Chemical changes occur when a new substance is formed. When bonds are broken and new ones are formed. EX: Change in colour, precipitate...
To predict whether a reaction will happen or not. you have to compere their positions on the reactivity series.
Synthesis reactions are reactions in which 2 reactants combine to make a larger or more complex product; general pattern is A+B-->AB.
Decomposition reactions are reactions in which a larger or more complex compound breaks down breaks down to form 2 or more simpler products; general patter in AB-->A+B.
In single displacement reactions; refer to water, acids and chlorine as ionic compounds when writing down chemical equations.
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Double displacement reactions are reactions in which elements in 2 compounds displace eachother or trade places, producing 2 new compounds; general pattern: AB+CD-->AD+BC
Double displacement reactions products vary. Most produce precipitates, some release gas and others form neutralized solutions
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Combustion is a chemical reaction in which a fuel burns in oxygen to produce combustion products and, often, a flame
Complete combustion of a hydrocarbon is the burning of a in a plentiful supply of oxygen to produce carbon dioxide (which is GHG), water and energy.
Incomplete combustion is the burning of a hydrocarbon in the limited supply of oxygen; products may include carbon dioxide, carbon monoxide, water, and energy.
Incomplete combustion releases only a portion of energy that may be contained from hydrocarbon fuels
Soot produced from incomplete combustions form an inhalation hazard. Carbon monoxide is a "silent killer". It binds with hemoglobin to prevent oxygen from reaching the tissues.
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Nitrogen oxide causes respiratory diseases and nitrous acid. Carbon oxides cause acid rain. Sulfur oxides create sulfuric acid
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