If a decrease in temperature accompanies a reaction, what occurred?

a. energy was absorbed.

b. energy was released.

c. energy was destroyed.

d. energy was created

Option (A) is the correct answer.

Energy being absorbed, as the temperature decreases for the reaction to occur. This decrease in temperature for the reactants indicates energy being absorbed as the reaction proceeds. Thus, by absorbing energy, the reactants are converted into the required products.

Hence, when temperature decreases, the energy is absorbed and the reaction is said to be an endothermic reaction.

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.  

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.