The reaction below shows how the potential energy changes during a chemical reaction. What does the red arrow show?
Potential Energy
Reaction Progress
A. The change in enthalpy is negative, and the reaction is exothermic.
hegativ
B. The activation energy is positive, and the reaction is exothermic.
C. The activation energy is negative, and the reaction is endothermic.
D. The change in enthalpy is positive, and the reaction is
endothermic

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

The polymer used for the nonstick surface of cooking utensils is 24.0%c and 76%f by mass. what is the empirical formula of this polymer?

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n