Regents Chemistry
Name: _________________________________ Date Due_______
Pre-Lab Questions:
1.
According to the Collision Theory, list the 3 requirements for a chemical reaction to occur & explain why each requirement is necessary. a.
Rubric:
Pre-lab: ______/6
Analysis:_____/6
Graph trial 1: ____/4
Graph trial 2: ____/4
b.
c.
2.
Explain, in terms of collision theory, why each of the following stressors increase the rate of reaction. a.
Increasing temperature: b.
Increasing Concentration:
3.
Illustrate on the graphs how a catalyst affects the Activation Energy of each reaction.
endothermic: exothermic:
4.
Explain how a catalyst affects the rates of reaction for both the forward and reverse directions of a reaction.
5.
Do the rates of the forward reaction and the reverse reaction have to be equal at equilibrium?
6.
In an equilibrium reaction concentration changes, for reactants and products, as a function of time. Illustrate this on the graph:
7.
Do the concentrations of the reactants and products have to be equal at equilibrium?

DATA:
Trial 1 Reactant Cylinder Product Cylinder Trial 2 Reactant Cylinder Product Cylinder
Transfer
#
Straw size:
Volume (ml)
Straw size:
Volume (ml)
Transfer
#
Straw size:
Volume (ml)
Straw size:
Volume (ml)
0
1
2
3
4
5
6
7
8
25.00ml 0.00ml 0
1
2
3
4
5
6
7
8
0.00ml 25.00ml
9
10
11
12
13
9
10
11
12
13
14
Observations and Analysis: ANSWER IN FCGCS!
14
1.
PLOT DATA ON GRAPH PAPER – follow directions on lab handout & attach graph to final lab report
2.
In trial 1, did you use the larger diameter straw for the forward or reverse reaction?
3.
Once equilibrium was reached (in trial 1) was there a greater volume of products or reactants?
4.
Why was equilibrium established even though the volume of the product was unequal to the volume of the reactants?
5.
What variable determined whether there was a greater volume of reactants or products at equilibrium?
6.
Could this system be called a dynamic equilibrium? Why or why not?
7.
What information on your plotted graphs indicates that your trials reached equilibrium?