What is half-life? Half the life of an organism

The time it takes for the radioactivity of a specific isotope to fall to half its original value

The time it takes for a geologist to determine the age of a rock or mineral

The length and organism lived in prehistoric times

How far is the region from the equator or control climate

Compare and contrast the bohr model and the electron cloud models of the atom.

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 .