Question

Given the equation representing a reaction:H2(g) + I2(g) → 2HI(g)Which statement describes the energy changesthat occur in this reaction?

Answer 1

The statement describing the energy changes for the reaction H2(g) + I2(g) → 2HI(g) is that it is an exothermic process, with energy being released as heat when hydrogen iodide is formed. The reaction is also reversible and able to reach a state of equilibrium, where temperature changes can shift the position of the equilibrium.

Step-by-step explanation:

The equation H2(g) + I2(g) → 2HI(g) describes the chemical reaction between hydrogen gas and iodine gas to form hydrogen iodide. The statement that best describes the energy changes occurring in this reaction is that the reaction is exothermic. Upon forming hydrogen iodide, energy is released in the form of heat. This means that the products have less energy than the reactants, and consequently, the reaction releases energy to its surroundings.

Moreover, this reaction is reversible, meaning it can achieve a state of chemical equilibrium where the rate of the forward reaction (formation of HI) is equal to the rate of the reverse reaction (decomposition of HI into H2 and I2). When the reaction is at equilibrium, any change in temperature affects the position of the equilibrium. Increasing temperature shifts the equilibrium to the left (favoring reactants), while decreasing temperature shifts it to the right (favoring products).

Answer 2

The given question is incorrect, here is a complete question.

Given the equation representing a reaction:

`H_2(g)+I_2(g)\rightarrow 2HI(g)+Energy`

Which statement describes the energy changes that occur in this reaction?

(1) Energy is absorbed as bonds are formed, only.

(2) Energy is released as bonds are broken, only.

(3) Energy is absorbed as bonds are broken, and energy is released as bonds are formed.

(4) Energy is absorbed as bonds are formed, and energy is released as bonds are broken.

Answer : The correct option is, (3) Energy is absorbed as bonds are broken, and energy is released as bonds are formed.

Explanation :

Bond energy : It is defined as the amount of energy required to break a molecules into its component atoms.

At the time of bond formation, the energy is released and at the time of bond breaking, the energy is absorbed.

In the chemical reaction, when the energy is shown in product side that means the energy is released.

In the chemical reaction, when the energy is shown in reactant side that means the energy is absorbed.

Hence, the correct option is, (3)