Double Displacement Reactions and ionic equations Double-Displacement Reactions (Gas Formation Reactions) -In some double-displacement reactions, a gas is formed, which helps drive the reaction to completion. Double Displacement Reactions (Acid Base Neutralization Reactions) in an acid base neutralization reactions, the driving force is the formation of H2O a molecular compound. Combustion Reactions -A combustion reaction is a 5th type of reaction that does not fall into one of the earlier categories. -In a combustion reaction, a substance reacts with oxygen in a reaction that burns to produce a flame Combustion of Hydrocarbons -The most common combustion reactions involve the burning of a hydrocarbon or a hydrocarbon with oxygen. The products are always carbon dioxide and water. Representing Reactions in Aqueous Solution -When reactions occur in water soluble ionic compounds exist as separate ions not grouped together with each other as might seem so from the equation sometimes called a molecular equation.
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