Worksheet Experiment
Group :____________Date :__________Name :____________
Purposes :
Students are able to conclude the effects of surface area, temperature, and
concentration on the rate of reaction based on experiments data.
Introduction
The rate at which a
reaction takes place can be measured by working out how much of one of the products
has been made in a given time, or how much of a reactant is used up in a given
time.
Why does the rate
of reaction change? For a chemical reaction to take place, the particles of
the reactants involved have to collide
with each other with enough energy to react together. At the start of a
reaction there a lots of particles that have not reacted.Collisions happen frequently. As the particles react, the number
that have not reacted gets lower and lower. The chance of two unreacted
particles colliding with each other decreaces.Eventually, all the particles
have reacted. There no more collisions and the reaction has finished.
What factors that
affect the rate of reactions?
1. increased temperature
2. increased concentration of dissolved reactants,
3. increased surface area of solid reactants
4. use of a catalyst.
Apparatus/ Materials :
-
Test
tube + rack -stopwatch - egg shell
-
Vinegar/
acetic acid (CH3COOH) -
pipette -rock sugar
-
Ballons - beaker
100 mL - hot plate
-
Stirer -
erlenmeyer 100 mL
Activity 1
The effect of
surface area
Procedure
1. Take 2 erlenmeyer
flask 100 mL, add 20 mL of CH3COOH into each erlenmeyer
2. Enter the egg
shells into the 2 balloons then put the balloon in erlenmeyer
3. Mix egg shells
and CH3COOH in each erlenmeyer, at
the same time then record time with a stopwatch until the ballon already
stand or has expand
5. Write down
your observation
No
|
Reaction
|
Time until the balloons has expand
|
Observation
|
Question :
1. Which reaction
will be fastest?
___________________________________________________________________
2. Which size of
egg shell react more quickly?
___________________________________________________________________
3. What effect
does increasing the total surface area have on rate of reaction?
___________________________________________________________________
4. Explain the
reason for the change in reaction rate.
___________________________________________________________________
Activity 2
The effect of
temperature
Procedure
1. Take 2 beaker glass 100 mL.
2. Add 30 mL of cold water into glass I and 30 mL of warm water into glass
II.
3. Record the temperature of water in each beaker glass
4. Put 2 gr of rock sugar in to each beaker glass
5. Stir the sugar until it disappears and record the time.
6. write down your observation
No
|
Reaction
|
Time until the balloons has expand
|
Observation
|
Question :
1. Plot a graph of your results
____________________________________________________________________
2. Describe the relationship between the temperature and the rate of
reaction
____________________________________________________________________
____________________________________________________________________
Activity 3
The effect
concentration
Procedure
1. Take 2
test-tube and label I and II, add 10 mL of CH3COOH 0,1 M into
test-tube I and CH3COOH 1,0 M into test-tube II
2. Enter 2 gr of
baking into the 2 balloons then put the balloon in the test-tube
3. Mix CH3COOH
and baking soda in each test-tube, at the
same time then record time with a stopwatch until the ballon already stand
or has expand
5. Write down
your observation
No
|
Reaction
|
Time until the balloons has expand
|
Observation
|
Question :
1.Plot a graph of your results
____________________________________________________________________
2. Which concentration of CH3COOH gave the fastest reaction?
____________________________________________________________________
3. Explain what the effect of concentration
____________________________________________________________________
____________________________________________________________________
Conclusion :
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