thermochemistry 3

Explain how the following changes affected the rate of reaction. Consider using concepts learned from Collision theory in your explanation.

a. Rather than adding one solid chunk of Magnesium, a chemist brakes the Magnesium into many pieces prior to adding it to a HCl solution.

Mg + 2HCl MgCl₂ + H₂

b. Hydrogen peroxide naturally decomposes into water and oxygen gas. When potassium iodide is added to the solution. The solution begins to bubble more vigorously.

2H₂O₂ 2H₂O + O₂