MARKING BRAINLIEST! HURRY!! Read the following list of objects:

a flying insect, a stretched elastic band, a falling stone, a flowing river, a coiled spring

Which of the objects have only potential energy?

A flying insect, a coiled spring
A stretched elastic band, a coiled spring
A falling stone, a flying insect
A flowing river, a flying insect

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

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There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .