SOME PLEASE HELP The law of conservation of energy states that energy cannot be created or destroyed. Which of the following is true in an exothermic reaction?
a. Heat plus the chemical energy of the reactants is converted into the chemical energy of the products.
b. The chemical energy of the reactants is converted into heat plus the chemical energy of the products.
c. The total amount of energy before the reaction is greater than the total amount of energy after the reaction.
d. The total amount of energy before the reaction is less than the total amount of energy after the reaction.

It is A

Explanation:

Thats because if heat reacts to chemicals then it would be a chemical energy spreading onto other objects in its surroundings  

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

56 moles of   lieter in chemistry