The only example which is not a state change is wood burning into a fire, which is a <em>chemical</em> change. The remainder of the choices are all changes of state. e.g. changing between solid, liquid, and gas phases, with no chemical reaction.
Answer:
Blue
Explanation:
If you look at a flame, blue is always at the bottom right? So that would be common sense that blue would be the hottest.
A. K+, OH-
B. C6H5CO+, OH-
C. NH4+, Cl-
D. Mg++, 2 NO3-
Everything has 1 except for the Nitrate ion in D, which has 2
Transition Metals can have more than one possible charge.
The answer would be B, 7 valence electrons. <span>F is located
in the 1s-orbital and the second energy level, which in fluorine's case
is the outermost energy level, meaning it has <span>7 electrons</span></span>