The illustration below shows how the particles in a substance act in a solid, liquid, and gas. Which of the following causes a substance/object to change from one physical state to another? * 1 point

A. an increase or decrease in the temperature of a substance/object causing it to reach a boiling or melting point
B. the bending and shaping of a substance/object
C. mixing a substance with another substance/object
D. all of these will cause a substance/object to change physical states

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 .