Consider the reaction for the formation of aluminum oxide from aluminum and oxygen. 4Al(s)+3O2(g)⟶2Al2O3(s) ΔH1 Express the enthalpy of the following reaction, ΔH2, in terms of ΔH1. 2Al2O3(s)⟶4Al(s)+3O2(g) ΔH2 ΔH2= Express the enthalpy of the following reaction, ΔH3, in terms of ΔH1. 12Al(s)+9O2(g)⟶6Al2O3(s) ΔH3 ΔH3= Express the enthalpy of the following reaction, ΔH4, in terms of ΔH1 2Al(s)+3/2O2(g)⟶Al2O3(s)ΔH4 ΔH4=

the term hydride is commonly named after binary compounds that hydrogen forms with other elements of the periodic table. hydride compounds in general form with almost any element, except a few noble gases. the trends and properties vary according to the type of intermolecular force that bonds the elements together, the temperature, its molecular masses, and other components. hydrides are classified into three major groups, depending on what elements the hydrogen bonds to. the three major groups are covalent, ionic, and metallic hydrides. formally, hydride is known as the negative ion of a hydrogen, h-, also called a hydride ion. because of this negative charge, hydrides have reducing, or basic properties. its special characteristics will be further discussed.

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