LAB7
Name ____________________________________________
Clark Science Period _____________
Rocks and Weathering
Date ___________
Problem:
How does chemical and mechanical weathering affect limestone?
Questions:
Main Ideas/Facts/Details
What is weathering?
What contributes to weathering?
What is erosion?
How do weathering and erosion
work together?
What are the two types of
weathering? Give the definition
and two examples of causes for
each for each.
Bibliography Information: Note: You won’t fill in every item, depending on the type of source.
This source is a:
________________
Author’s Last Name
Date Published
Book
Magazine
Newpaper
Website
Other:
First Name
Middle Initial
Publication/Website Title
Title of Article
(periodicals, encyclopedias, websites)
Place Published
Publisher
(books only)
(books only)
Edition
Volume Number
(if applicable)
(periodicals or encyclopedias)
Website is a
Company
Organization
Government
Newspaper/Magazine
_________________________
The URL is http://
(websites only)
Editor
(if applicable)
Page Number(s)
Other:
Last Date of Access
(websites only)
LAB7A
Questions:
Main Ideas/Facts/Details
What is acid rain? (Include what
type of weathering it is and what
causes it.)
Compare the acidity of tap
water, rainwater, vinegar, and
acid rain.
The acidity (pH) of tap water is around 7, which is neutral; the acidity (pH) of
rainwater is around 5.7; the acidity (pH) of acid rain is around 5.2; the acidity
(pH) of white vinegar is around 5.0. NOTE: acidity increases as pH decreases.
Does acid rain weather rock
faster than regular rain? Why
(compare acidity)?
What is Limestone?
Sedimentary rock
Made of the mineral calcite or calcium carbonate
Used in architecture and sculpture
What determines the rate of
weathering?
Bibliography Information: Note: You won’t fill in every item, depending on the type of source.
This source is a:
________________
Author’s Last Name
Date Published
Book
Magazine
Newpaper
Website
Other:
First Name
Middle Initial
Publication/Website Title
Title of Article
(periodicals, encyclopedias, websites)
Place Published
Publisher
(books only)
(books only)
Edition
Volume Number
(if applicable)
(periodicals or encyclopedias)
Website is a
Company
Organization
Government
Newspaper/Magazine
_________________________
The URL is http://
(websites only)
Editor
(if applicable)
Page Number(s)
Other:
Last Date of Access
(websites only)
Name ____________________________________________
LAB7B
Clark Science Period _____________
Rocks and Weathering
Date ___________
Prior Research
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Works Cited
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LAB7C
Problem:
How will shaking and acid conditions affect the rate at which limestone weathers?
Variables:
Independent or Manipulated Variable: __________________________________________________________________
Dependent or Responding Variable: ____________________________________________________________________
Constant Variables:
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______________________________________
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______________________________________
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______________________________________
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______________________________________
Title:
The effect of ______________________________________________________________________________________
_________________________________________________________________________________________________
Hypothesis:
_________________________________________________________________________________________________
_________________________________________________________________________________________________
_________________________________________________________________________________________________
_________________________________________________________________________________________________
_________________________________________________________________________________________________
_________________________________________________________________________________________________
Methods:
Materials:
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40 g limestone chips (water-soaked)
50 ml of acetic acid
50 ml of water
4 watertight plastic containers(blanks)with screw on tops
triple beam balance
masking tape
marking pen or pencil
graduated cylinder, 100 mL
paper towels
stopwatch
safety goggles
Procedures:
1. Gather materials and organize lab station.
2. Put on safety goggles. (Keep them on!)
3. Use masking tape to label the 4 containers (A, B, C, and D)
LAB7D
Name ____________________________________________
Clark Science Period _____________
Rocks and Weathering
Date ___________
4. Using the graduated cylinder, measure 25 ml of water. Be sure to read the cylinder at eye level. Pour the water into
container A. Repeat for container B.
5. Using the graduated cylinder, put 25 ml of acetic acid into containers C and D.
6. Zero the triple-beam balance, then slide the rider on the 10s bar to the spot for 10 grams. Place limestone on the pan
until there is slightly more than 10 grams.
7. Adjust the balance to find the exact mass of the limestone.
8. Make sure there is between 10 to 12 grams of limestone.
9. Record the exact mass of the sample on the data table. Carefully slide the pieces onto your hand, and then add the
limestone to container A. Place lid on top and seal.
10. Wipe the pan of the balance with a paper towel.
11. Repeat steps 6 through 10 for containers B, C, and D.
12. Ensure the lids are tightly sealed on containers B and D. Shake these containers for ten minutes (time with
stopwatch). Make sure that the intensity of shaking is the same for both containers. TIP: Shake side-to-side, not up-anddown.
13. Carefully pour the liquid out of all containers. Dry the samples with a paper towel. Put them into marked cups and then
place the samples onto the provided lab sheet. Be sure to place samples in the spot marked with the letter from their
container s.
14. Clean up lab station. Rinse and dry all containers and properly dispose of all trash. Return unused materials to the
designated supply station.
15. Allow the limestone to dry, then re-weigh the limestone and record the final mass in the data table.
16. Calculate the change in mass for all 4 samples of limestone and record in the data table.
17. Calculate the % change in mass. Share data with the class and work to find the class average % change in mass.
18. Analyze results.
Results:
Data Table:
The effect of _____________________________________________________________________________________
DV: ____________________________________________________________
IV:______________________________
% Change in
Mass
A
B
C
D
Initial Mass
Final Mass
Change in Mass
LAB7E
Graph: