In the early days of automobiles, illumination at night was provided by burning acetylene, c2h2. though no longer used as auto headlamps, acetylene is still used as a source of light by some cave explorers. the acetylene is (was) prepared in the lamp by the reaction of water with calcium carbide, cac2: cac2(s)+2h2o(l)⟶ca(oh)2(s)+c2h2(g). calculate the standard enthalpy of the reaction. the δh∘f of cac2 is −15.14 kcal/mol.

answer: they produce more slow than unicellular organisms.

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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