Name _______________________ Block ____ Date ____/____/____
Enzyme Activity
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. Suppose you added a spoonful of sugar to hot water and another to ice-cold water.
Which type of water will cause the sugar to dissolve more quickly? ___The sugar will
dissolve quicker in the warm watr_____________
2. Suppose you held a lighted match to a solid hunk of wood and another match to a pile of
wood shavings. Which form of wood will catch fire more easily? ______wood shaving
would catch fire more easily____________
Gizmo Warm-up
An enzyme is a protein that acts as a catalyst for metabolism. A
catalyst speeds a chemical reaction by reducing the amount of
energy required to convert reactants into products. The enzymes
are not changed by the reaction and can be reused over and
over again. The Enzyme Activity Gizmo allows you to experiment
with several factors that affect the rate at which enzymes catalyze
a reaction.
You will need blue, green, and orange markers or colored
pencils for the first part of this activity.
1. Look at the key at the bottom of the SIMULATION pane. In the space below, draw the two
reactants and two products of this chemical reaction. Use colored pencils for your drawing.
Reactants: Products:
2. Select the ANIMATION tab. Select WITH CATALYST and observe. What do you
observe when the catalyst contacts the reactants? ____The orange molecule
switched_______________________
3. Why do you think the shape of a catalyst is important? _______________the shape
determines the acceleration ___________
Get the Gizmo ready:
Activity A: Click Reset ( ).
Check that the Reactant Concentration is set to
Enzyme
2.0 mol/L, the Surface Area is Maximum, the
Concentration
Temperature is 37 0C, and the Simulation Speed
is at a Maximum rate.
Question: How does concentration of an enzyme affect the rate of a chemical reaction?
1. Predict: How do you think enzyme concentration will affect the rate of a chemical
reaction? ______A higher concentration of enzymes will speed up the rate of the
reaction________________________________________________________
2. Gather Data: On the CONTROLS pane, set the Catalyst Concentration to 0.05 mol/L.
Start the gizmo. Allow it to run for 5 min. the press pause. Record the amount of product
produced. Repeat for three trials at each concentration in the data table. Calculate the
means.
Enzyme (catalyst) Concentration
Trial
0.05 mol/L 0.15 mol/L 0.25 mol/L
1 16 32 32
2 26 36 36
3 20 34 40
mean 20.6 34.0 36.0
3. Analyze: What do your results indicate concerning enzyme concentration and products
produced? __When the enzyme concentration is on 0.05 it averages 20.6 or product
produced but when its at 0.20 it averages 36 of product produced
______________________________________________________________
4. Draw Conclusions: How does the concentration of an enzyme affect the rate of a
chemical reaction? ____Increasing enzyme concentration will speed up the rate of the
reaction______________________________________________________
Get the Gizmo ready:
Activity B: Click Reset ( ).
Check that the Catalyst Concentration is set to
Reactant
0.1 mol/L, , the Surface Area is Maximum, the
Concentration
Temperature is 37 0C, and the Simulation Speed
is at a Maximum rate.
1. Predict: How do you think reactant concentration will affect the rate of a chemical
reaction? ___A higher concentration of reaction will speed up the rate of the
reactions.___________________________________________________________
2. Gather Data: On the CONTROLS pane, set the Reactant Concentration to 0.5 mol/L.
Start the gizmo. Allow it to run for 5 min. the press pause. Record the amount of product
produced. Repeat for three trials at each concentration in the data table. Calculate the
means.
Reactant Concentration
Trial
0.5 mol/L 1.5 mol/L 2.0 mol/L
1 6 26 28
2 8 24 26
3 8 26 26
mean 7.3 25.3 26.6
3. Analyze: What do your results indicate concerning reactant concentration and products
produced? ______The higher the reactant concentration is the higher the amount of
products produced
__________________________________________________________
_________________________________________________________________________
4. Draw Conclusions: How does the concentration of a reactant affect the rate of a
chemical reaction? _Increasing the concentration of one or more reactants will
increase the rate of reaction.
_________________________________________________________
_________________________________________________________________________
Get the Gizmo ready:
Click Reset ( ).
Activity C:
Check that the Reactant Concentration is set to
Temperature 2.0 mol/L, the Catalyst Concentration is set to
0.10 mol/L, the Surface Area is Maximum, and
the Simulation Speed is at a Maximum rate.
1. Predict: How do you think temperature will affect the rate of a chemical reaction?
_Increasing the tempature will also increase the rate of the reaction._____
______________________________________________________________________
2. Gather Data: Start the gizmo. Allow it to run for 5 min. the press pause. Record the
amount of product produced. Repeat for three trials at each concentration in the data
table. Calculate the means
Temperature
Trial o o
0 C 50 C 100 oC 150 oC 200 oC
1 30 34 32 38 38
2 26 30 30 36 36
3 28 32 34 36 38
mean 28.0 32.0 32.0 36.6 37.3
3. Analyze: What do your results indicate concerning temperature and products produced?
_______The higher the tempature the higher the average of the products produced
_______________________________________________________________
4. Draw Conclusions: How does the temperature affect the rate of a chemical reaction?
____Increasing the tempature increases the average speed of reactants .
__________________________________________________________________
Get the Gizmo ready:
Click Reset ( ).
Activity D: Check that the Reactant Concentration is set to
2.0 mol/L, the Catalyst Concentration is set to
Chewing
0.25 mol/L, the Surface Area is Maximum, the
Temperature is 37 0C, and the Simulation Speed
is at a maximum rate.
1. Predict: How do you think chewing will affect the rate of a chemical reaction?
__Chewing increases the rate of the reaction._______
______________________________________________________________________
2. Gather Data: On the CONTROLS pane, set the surface area to minimum to simulate
swallowing a solid chunk of food. Allow it to run for 5 minutes Record the number of
products in the data table. Repeat for three trials and calculate the means.
Surface Area (Chewing)
Trial
Products Products
1 69.05 9:37
2 75.24 5:05
3 58.56 9:31
mean 67.61 7.91
3. What is the value of chewing food before swallowing? ___It breaks down the food to
have more surface area ________________________
______________________________________________________________________
______________________________________________________________________
4. Draw Conclusions: How does the surface area affect the rate of a chemical reaction?
_More surface area sped up the reaction._
______________________________________________________________________
______________________________________________________________________
