In terms of energy, how would you classify the following chemical reaction?
2cu + o2 -> 2cuo + 315 kj
a. endothermic
b. exothermic
c. both endothermic and exothermic
d. neither endothermic nor exothermic
2. the total amount of energy before and after a chemical reaction is the same. thus, energy is
a. created
b. destroyed
c. conserved
d. the same as mass

1. Answer;

- Exothermic reaction

Explanation;

-Exothermic reactions are types of chemical reactions in which heat energy is released to the surroundings. Since enthalpy change is the difference between the energy of products an that of reactants. It means that in an exothermic reaction the energy of products is less than that of products. In this case an energy of 315kJ is released to the surroundings.

2. Answer;

Conserved

-The total amount of energy before and after a chemical reaction is the same. Thus, energy is conserved.

Explanation;

-According to the law of conservation of energy, energy is neither created nor destroyed. Energy may change form during a chemical reaction. For example, energy may change form from chemical energy to heat energy when gas burns in a furnace. However, the exact amount of energy remains after the reaction as before, which is true for all chemical reactions.