Which of the following waves are mechanical waves? (More than one choice may be correct.) Group of answer choices

A sound wave which moves through the air

A wave in the ocean

A seismic wave which moves through the ground

An electromagnetic wave which moves through outer space

Will mark brainliest how many electrons can be held in the energy level n = 4?

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 .

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these