Question

Cinnabar can be converted into Oxide by
A) Roasting
B) Reduction
C) Calcination
D) Heating it with sulphur
The source of energy in nuclear power reactor
A) Nuclear fission reaction
B) Exothermic Chemical reaction
C) Nuclear fusion reaction
D) Controlled nuclear fission chain reaction​

Answer 1

Answer:

Explanation:

Nuclear changes occur with a simultaneous release of energy. Where does this energy come from? If we could precisely measure the masses of the reactants and products of a nuclear reaction, we would notice that the amount of mass drops slightly in the conversion from reactants to products. Consider the following nuclear equation, in which the molar mass of each species is indicated to four decimal places:

nuclear_equation_1

If we compare the mass of the reactant (235.0439) to the masses of the products (sum = 234.8605), we notice a mass difference of −0.1834 g, or −0.0001834 kg. Where did this mass go?

According to Albert Einstein’s theory of relativity, energy (E) and mass (m) are related by the following equation:

E = mc2