The wavelength will remain the same. The wavelength will increase and then decrease sharply.
3 points
7. A photon has an energy of 5.53 x 10^-17 Joules when the frequency is
8.34 X 10^16 Hz. What will happen to the energy of the photon if the
frequency is decreased to 2.79 X 10^8 Hz? Note: 8, 16, & 17 are exponents.
The energy will decrease.
The energy will increase.
The energy will remain the same.
The energy will increase and then decrease dramatically

b.final

the correct answer is:

a. formation of precipitation

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.