✔ 最佳答案
In the reaction between magnesium and hydrochloric acid, the actual reaction is between magnesium and hydrogen ions in the acid.
Mg(s) + 2H^+(aq) → Mg^2+(aq) + H2(g)
The reaction is caused by collisions of the H^+(aq) ions to the surface of the Mg(s).
The basic idea of the rate of the reaction is that:
The more frequent the collisions between particles of reactants in each second, the higher the reaction rate is.
Statement 1 is correct. When the surface area of magnesium metal increases, H^+(aq) ions have a greater probability to collide the surface of the magnesium metal. Therefore, the number of collisions of the H^+(aq) ions to the surface of the Mg(s) in each second increases. This leads to a higher reaction rate.
Statement 2 is correct. When the concentrations increases, the concentration of the H^+(aq) in the solution also increases, and the surface of the magnesium has a greater probability to be collided by H^+(aq) ions. Therefore, the number of collisions of the H^+(aq) ions to the surface of the Mg(s) in each second increases. This leads to a higher reaction rate.
2010-03-30 02:07:51 補充：
You've got the wrong answer. The first one is true.
Magnesium powder has a greater surface area than magneium ribbon of the same mass. Obviously, magnesium powder reacts faster than magnesium ribbon.
