Answer to Question #309676 in Chemistry for mcc

Question

Explosion of a firecracker triggered by a spark is _________.

a. endothermic

b. exothermic

c. partly exothermic

d. both endothermic and exothermic

Enthalpy of reaction is positive when _______________.

a. chemical reaction is endothermic.

b. chemical reaction is both endothermic and exothermic.

c. chemical combustion does not happen.

d. the amount of heat transferred and absorbed are unequal.

Law of Conservation of Energy states that, ______________.

a. Energy can neither be created nor destroyed.

b. The change in energy of a system is equal to the heat absorbed and released.

c. The energy of the system and the of the surroindings are unrelated.

d. Energy can neither be created nor transferred.

Answer 1

Solution:

(B) Explosion of a firecracker triggered by a spark is a exothermic reaction.

(A) Enthalpy of reaction is positive when chemical reaction is endothermic.

(A) Law of Conservation of Energy states that energy can neither be created nor destroyed.