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Weathering and Erosion

Investigation 1 – Lab

 

 

 

 

 

 

 

MINDSET

This Investigation is designed to:

  • help you recognize that weathering includes both physical and chemical weathering,
  • provide you with the opportunity to model physical weathering of marble,
  • provide you with the opportunity to  model the chemical weathering of marble, and
  • allow you to investigate the factors that affect physical and chemical weathering.

 

BE PREPARED

Student Preparation for the Investigation includes having students gather the following materials.

Note: These materials are listed in your SDR. They are also listed below for your reference.

  • (1) triple beam balance
  • (1) weigh dish
  • (1) lab scoop
  • (1) 50ml beaker containing marble chips
  • (1) 100ml graduated cylinder
  • (2) 500ml Erlenmeyer flasks
  • (1) 50ml beaker containing calcium carbonate
  • (1) 400ml beaker containing hydrochloric acid
  • (1) pair of goggles per student
  • (1) pair of gloves per student

Direct one student from each lab group to collect the materials listed in their SDRs.

INVESTIGATE

  • You will perform three Trials during this Investigation.
    • Trial 1 introduces you to the physical weathering of marble.
    • Trial 2 introduces you to the chemical weathering of marble.
    • Trial 3 introduces you to the combination of physical and chemical weathering.
  • Complete the Recall section in your SDR.
  • Reflect on the PreLab video as you move through the procedural steps.
  • During the Experiment, every procedural step is important. If one step is skipped, data can become invalid. To help you keep on track, read each step thoroughly, complete the step, then check it off (Read it – Do it – Check it).
  • Complete all of the procedural steps in your SDR.

Note: The procedural steps are listed below for your reference.

 

Trial 1
  1. In this Trial, you will analyze how physical weathering can affect pieces of marble.
  2. Using the triple beam balance, lab scoop and a weigh dish, add enough marble chips to obtain a mass of about 5g.
  3. Remove the weigh dish and place it on the lab table.
  4. Use the lab scoop and try to physically weather the marble chips by reducing them to smaller pieces.
  5. Answer the questions.

Trial 2

  1. In this Trial, you will analyze how chemical weathering can affect pieces of marble.
  2. Use the 100ml graduated cylinder to measure 50ml of hydrochloric acid and pour it into the 500ml Erlenmeyer flask.
  3. Add all of the marble chips to the hydrochloric acid in the flask. Swirl the flask so the chips are completely mixed with the acid.
  4. Observe the chips and answer the questions.

Trial 3

  1. In Trial 1, you found it difficult to reduce the size of the marble chips because they are too hard.
  2. In Trial 3, you will use calcium carbonate powder as a model of marble that has been physically weathered and reduced in size to very small pieces. You will analyze how chemical weathering affects these small pieces of marble.
  3. Using the triple beam balance, weigh dish and lab scoop, add enough calcium carbonate to obtain a mass of 5g.
  4. Use the 100ml graduated cylinder to measure 50ml of hydrochloric acid and pour it into the second 500ml Erlenmeyer flask.
  5. Add all of the calcium carbonate powder to the hydrochloric acid in the flask.
  6. Observe the flask and answer the questions.

 

CLEAN UP

Be sure to work with your group to clean up after you have finished your experiments.