Posted by Chuck on Monday, March 3, 2008 at 8:58pm.
These are thought questions. Let's hear your thoughts and we can offer suggestions.
c. the increase in temperature, increases the speed and energy of the collisions, causing the reaction to occur faster.
a. by increasing the concentration, there are more particles, which means they will collide more frequently causing a faster reaction.
Your answers to a and c look good.
b. The addition of a catalyst increases the rate of reaction because it offers the reaction an alternative path from reactants to products. Many reactions are slow because they have a high "activation energy"; that is, a high hump which the molecules must get over before the reaction will occur. The reaction is slow because most of the molecules don't have that energy to "get over the hump" so it proceeds slower. The catalyst lowers the activation energy (by providing the alternative path) and more molecules have that lower energy requirement. You can take this and redo it in your own words; this is too long an answer but it provides you with the information to distill it to one or two sentences.
d. A catalyst in poweder form gives MUCH more surface area than in solid block form. Catalyzed reactions often occur on the surface of the catalyst (that's where the alternative pathway comes into the picture) so more surface means more molecules can engage each other.
Related Questions
chemistry - H2C=CH2(g) + H2(g) C2H6(g) Adding a small amount of platinum powder ...
Chemistry - Explain the following observation in terms of the collision theory, ...
Chemistry - During rate of reverse step... A. A catalyst decreases the reverse ...
chemistry - The rate law of the overall reaction. A + B -> C is rate = k...
Chemistry - Given the reaction system; 2 NO (g) + O2 (g) -> 2 NO2 (g) ...
Chemistry - Given the reaction system; 2 NO (g) + O2 (g) -> 2 NO2 (g) ...
Chemistry - Which of the following is the BEST explanation for why a catalyst ...
Chemistry - Which of the following is the BEST explanation for why a catalyst ...
Chemistry - Which of the following is the BEST explanation for why a catalyst ...
Chemistry (again) - I need help with this question: Suppose you bake two cakes ...
For Further Reading
