Draw the curved arrow mechanism for the Diels alder reaction between cyclopentadienone and acetylene to form benzene.

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.

What are the coefficients to balance the following equation? ba+br=babr2

Where are the noble gases located in the periodic table? a. in the center b. on the left side c. in the upper right corner d. on the far right side