Engineers create a new metal that is stronger than steel but much lighter. This material is also significantly cheaper than what is currently used for
most aircraft, available in large quantities, and easy to manufacture. What is
the best step for the engineers to make next?
A. Design a new airplane with this new material.
B. Build a new plane with this material.
C. Decide what profit margins they would like to see for this new
technology.
D. Test the new airplane in a wind tunnel test.

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Can someone me with 1 to 4 plz. fast

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 .