Below is a proposed two-step mechanism for the decomposition of hydrogen peroxide: h2o2(aq) + br−(aq) → h2o(ℓ) + bro−(aq) slow bro−(aq) + h2o2(aq) → h2o(ℓ) + o2(g) + br−(aq) fast is this homogeneous or heterogeneous catalysis? also identify the catalyst in the mechanism.

Answer : This is homogeneous catalysis. Br⁻ is behaving as a catalyst

Explanation :

Let us write down the given reactions.

.....Slow

.....Fast

A catalyst is defined as a substance that increases the rate of the reaction.

A catalyst takes part in the reaction by reacting with the reactants to form an intermediate. But it is regenerated at the end of the reaction.

If we take a look at the above reactions, we can see that bromide ion Br⁻ is reacting with H₂O₂ to form an intermediate BrO⁻. It is also getting regenerated back at the end. That means Br⁻ is behaving as a catalyst.

We can also see that the reactant and the catalyst are in the same phase which is aqueous phase. Therefore the reaction is homogeneous.

A homogeneous reaction is the one where the reactants and the catalyst are in the same phase.

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j