Laboratory Activity 1.2.1: The Effect of Surface Area on the Rate of Reaction |
Problem statement: How does the total surface area of reactants affect the rate of reaction?
Hypothesis: The bigger surface area of the reactants are exposed, the higher the rate of reaction.
Variable:
» | Fixed variable : Temperature and the quantity of the reactants | |
» | Manipulated variable : Size of the reactants | |
» | Responding variable : Rate of reaction |
Material: » Calcium carbonate chips » Calcium carbonate powder » Hydrochloric acid 0.2mol dm-3 |
Apparatus: » Burette » Conical flask » Measurement cylinder » Stopwatch » Retort stand with clamp » Basin » Delivery tube |
► | ||||||||||||||||||
► |
|
► | Calcium carbonate chips
|
|||||||||||||||||||||||||||||||||||||
► | Calcium carbonate powder
|
► | ||||||
► | Average rate of reaction in 300 seconds:
|
|||||
► | Based on the graph, the gradient for the calcium carbonate powder is steeper compared to calcium carbonate chips. This implies that the rate of reaction for calcium carbonate powder is higher. |
► | Marble reacted with dilute hydrochloric acid to produce carbon dioxide, CO2, gas, as shown in the following equation: CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l) |
|
► | Calcium carbonate powder has a larger total exposed surface area compared to calcium carbonate chips. Thus, the rate of reaction for calcium carbonate powder is higher. | |
► | Based on the result of the experiment, the rate of reaction decreases with time (as the graph gradient decreases with increasing time). The concentration of hydrochloric acid and the mass of calcium carbonate decrease with time.
|
► | The smaller the size of reactant, the higher the rate of reaction. |
⇲ For exercise(objective and subjective), download for free on Android OS. | |
No comments:
Post a Comment