Which of the following is NOT a clue that could indicate a chemical change? A. Change in color
B. Mixing of reactants
C. Change in energy
D. Release of a gas
E. Formation of a precipitate

i think its C, but im not 100% sure. if not c, then D, but C sounds more right.

Explanation:

everything else sounds like sure fire sighs of a chem change. good luck

b. th3 n4zc4 pl4t3 15 c0nv3rg1ng w1th the s0uth 4m3ric4n pl4t3.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."