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Southern Illinois University, Carbondale *

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REC-401

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Geology

Date

Jun 19, 2024

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pdf

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3

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SES4U Learning Activity 5.4 Experiments in Weathering Observations Experiments in Weathering – Observations Experiment 1: Bar soap and water What happens to the soap as the water is applied? Briefly explain how the weathering works. Experiment 2: Chalk and vinegar What happens to the chalk as the vinegar is applied? Briefly explain how the weathering works. Experiment 3: Beans in a sealed container What happens to the lid on the plastic tub? Briefly explain how the weathering works. Copyright © 2021 The Ontario Educational Communications Authority. All rights reserved. 1 When water runs over soap, the sharp edges gradually soften as they come into contact with the water. The portions where water flows carry away soap particles, causing those areas to be washed off along with the water. This process blunts the edges of the soap as the grains are removed by the water droplets. Flowing water washes away soap grains, effectively removing them from the soap. The water also dissolves minerals present in the soap, contributing to its weathering until external forces can no longer move it further. This process exemplifies physical weathering. The chalk bubbles and fizzes as a chemical reaction occurs, causing its surface to dissolve. This process results in a smoother appearance and increased brittleness. When vinegar is added to the chalk, a chemical reaction initiates, leading to the disintegration of parts of the chalk and altering its physical characteristics and chemical composition. The products of this reaction include carbon dioxide (seen as bubbles), water, and a calcium compound. This process exemplifies chemical weathering. The lid on the tub poped off after 24 hours. When the dried beans are mixed with water, the water is absorbed by the beans, which rehydrates and makes them larger. The container and its surroundings are under strain due to the expansion. The pressure builds up since there is nowhere for it to release, and finally it gets powerful enough to push against the lid and pop it off. A case of biological weathering occurs here.
SES4U Learning Activity 5.4 Experiments in Weathering Observations Gravestone weathering analysis Image #1: Rahn’s Index Description of weathering Image #2: Rahn’s Index Description of weathering Copyright © 2021 The Ontario Educational Communications Authority. All rights reserved. 2 2 The slightly rounded letters on the gravestone indicate low weathering. 1 The letters are clearly visible with very slight spotting on the rock, indicating very low weathering.
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