BIG IDEA: Rocks and minerals have properties that can be: observed, tested, described, identified and recorded.

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Presentation transcript:

BIG IDEA: Rocks and minerals have properties that can be: observed, tested, described, identified and recorded.

o What does the object look like? o Where have you seen it before? o What is it used for? o What do you think it is?

Today we are going to complete the last of 4 tests our Geologist has suggested to help identify Mr. Maxwell’s rock and mineral collection. The Geologist has asked us to use more of the information and materials provided to conduct an acid test. The results of an acid test can provide useful data for identifying and comparing minerals. I met with Mr. Maxwell this morning and he mentioned that he had just received more information from his geologist friend that would help us identify the minerals once we have completed this final test. Identifying the minerals will require us to use the data we collected from all four of our tests. What does the principal and geologist want us to do? What did the geologist give us to help? What is the problem we need to solve?

How can we…

So far we have conducted 3 tests to identify the luster, hardness, and color of the minerals in our principal’s collection. The final test that our geologist has asked us to complete is an acid test. How many of you are familiar with the term acid? Acid A chemical substance with a pH less than 7 that commonly reacts with metals and calcium carbonate in rocks. Examples of Acids: Acetic Acid (Vinegar), Sulfuric Acid (Car Batteries)

I think that we can…because…

In this investigation we are going to observe how minerals react to a common acid that you probably have in your refrigerator at home… Vinegar. Conducting an Acid Test:  Use a nail to scratch a small amount of mineral powder onto a glass plate. Place a drop of acid (vinegar) on the powder and use a magnifier to observe any reaction that may occur.  Place drops of acid directly on minerals that are too hard to scratch with a nail. Wipe the mineral clean with a paper towel after each test.

What would be the best way to organize our data for our acid test? Discuss in your table groups. Acid Test: Minerals #1-10

Share the results of your acid test with all members at your table group. Be ready to share your results with the class.

How can an acid test be used to identify minerals? Do you think this test alone will help us identify all of our minerals? How could this test be used to test for the presence of certain minerals in rocks?