Use the information below to answer the question that follows. Michael's soccer team has a game on a cold January day. One of the players on the other team hurts his leg. His
coach pulls out a small bag, makes some crushing motions, and the bag turn cold. The bag is placed on the injured
leg. In the meantime, the spectators are cold in the stands. To warm their hands they pull out small packages, crush
them, and the bags turn warm.
In the above narrative, what is the example of an exothermic reaction?
the soccer game
the ice pack
spectator package
the ball

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.

Find the mass, in grams, of 5.00*10^23 molecules of f2

Select the correct answer. wax is a nonpolar substance. in which type of substance is it the most soluble?