General Facts
What is the rate of reaction?
the change in the concentration as reactants are used up or products are created with time at a particular temp.
I increase the kinetic energy of the reactants and so more particles collide with the activation energy and the particles also collide more frequently. What factor am I?
temperature
I reacted two marble samples with HCl. One with marble chips and the other with marble powder. Which is expected to react faster and why?
The marble powder is expected to react faster due to its smaller particle size and large surface area. A larger surface area allows more of the marble to be exposed to the HCl = more frequent collisions = more effective collisions.
List two factors that affect the rate of reaction.
-
Increasing me increases the number of reacting particles per unit volume. As a result, the particles also collide more frequently and thus increases the chance of effective collision. What factor am I?
concentration
I reacted two marble samples with HCl. One was conducted at room temp. (25C) and one at 35C. Which is expected to react faster and why?
The one at 35C is expected to react approximately twice as fast as the one at room temp. This is because the kinetic energy of the reactants is increased and so more particles collide with the activation energy and the particles also collide more frequently. So the chance of effective collision is increased.
List the other two factors that affect the rate of reaction lol.
concentration, temperature, surface area (particle size), presence of a catalyst
I increase the rate of reaction by lowering the activation and providing an alternation pathway for the reaction but I remain unchanged at the end of the reaction. What factor am I?
presence of a catalyst
What type of gradient is expected at the beginning of a rate of reaction graph and why?
STEEP gradient because there s a high concentration of reactants and so the rate of reaction is the highest here.
What are the three conditions for effective collision?
1) particles must collide
2)particles must collide with sufficient energy
3)particles must collide with the correct orientation
I increase the rate of reaction by exposing more of the solid reactant to the other reactant. Thus, increasing the frequency of collision and the chances of effective collision.
surface area
Some processes in the body would take way too long to preserve homeostasis without the use of a biological catalyst. What are these catalysts called and how do catalysts speed up the rate of reaction?
Biological catalysts are called enzymes. Catalyst work by providing an alternate route for the reaction to take place with a lower activation energy. Thus, more particles will collide with the activation energy. This increases the chance of effective collision and thus increases the rate of reaction.