The iodination of acetone, ch3coch3, in aqueous solution is catalyzed by the hydrogen ion h+: i2+ch3coch3 h+⟶ hi+ch3coch2i the reaction can be followed visually by adding starch. the purple starch-iodine complex forms immediately, then disappears when the iodine has been consumed. the kinetics of the reaction may be determined by recording the time required for the color to disappear, which is the time required for the iodine, i2, to be consumed.

give me abc and i will get it for u.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.