REED COLLEGE SCIENCE OUTREACH PROPERTIES OF MATTER

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28 Chromatography Procedure 1. After you hand out the pieces of filter paper, instruct the students to use a pencil to label one piece “water” and the other “alcohol.” 2. Tape the top of the filter paper to a wooden dowel and lay the dowel across the mouth of the cup. Leave the strip of paper hanging in the cup. 3. Now slowly pour water into the cup so that only the bottom edge of the strip is wet. Do not let the water cover any part of the dots of ink! Also be sure that the water does not splash onto the paper. 4. Repeat the same procedure for the alcohol. 5. Watch the water/alcohol spread up the paper until it is about an inch from the top of the paper. Take the paper out of the cup and lay it on a paper towel so that the ink stops spreading. 6. Record the unique pattern for each of the known and mystery inks. Then compare the mystery ink’s pattern to those of the known inks. Can the students identify which ink was used for the mystery ink? Note: There will be different types of mystery ink used, so each group should have a different result. Wrap-up (10-15 Minutes): 8. Once the students have cleaned up their workstations, have them compare their results with the class. Was every group able to identify their mystery ink? 9. Give stickers to students for completed worksheets and be sure to check the Question Box for questions.
29 Lesson Seven- What is a Chemical Reaction? 2 Objectives o Students will learn to identify the characteristics of a chemical reaction. Lesson Background- Chemical Reactions Today students will dig deeper into the concept of chemical properties. They will also learn to identify signs of a chemical reaction. In a chemical reaction, atoms or molecules react and transform each other. You should emphasize to students that you start with two-or more-types of matter (each with their own properties) and that at the end of a chemical reaction you end up with new types of matter (with potentially different properties). The students already explored how atoms can interact with each other to form new molecules. Today students will learn that sometimes when molecules are mixed with each other they can also interact. You won’t want to go into much detail about how the individual atoms are interacting, but be sure to remind students that atoms like to form bonds with other atoms. Sometimes when you mix two types of molecules, the atoms “decide” that they would rather form bonds with a different atom, and so they switch partners. When they do this, a chemical reaction takes place. This process produces signs that students can observe, which will tell them a chemical reaction has taken place. These signs might include: • Appearance of a new gas, solid, or liquid • Appearance of light or change in temperature • Change in color • Change in pH Activity overview This week, students will work together to create the following chemical reacton: 2NaHCO3 + CaCl2 2NaCl + CaCO3 + CO2 (gas) + H2O (baking soda) (calcium chloride) (table salt) (limestone) (carbon dioxide) (water) The main reaction in the bag is between calcium chloride and baking soda. The calcium chloride causes the baking soda to break into CO2 gas and salt. Students will be able to identify these signs of a chemical reaction: • New gas: Since the carbon dioxide produced by the reaction is a gas, it will bubble out of the liquid into the bag. The gas will build up and begin to “blow up” the bag. There also may be some bubbling or fizzing. 2 Adapted from: “Reaction: Yes or No?,” Chemistry in the K-8 classroom, OMSI, 2007.
Page 1 and 2: REED COLLEGE SCIENCE OUTREACH SPRIN
Page 3 and 4: 3 Table of Contents Table of Conten
Page 5 and 6: 5 April 31 1 2 3 4 5 6 Week 7 7 Wee
Page 7 and 8: 7 Week Three Activity Overview Toda
Page 9 and 10: 9 8. Pass a small sample of fruit j
Page 11 and 12: 11 properties. The periodic table t
Page 13 and 14: 13 like to form a certain number of
Page 15 and 16: 15 Lesson Plan Review & Introductio
Page 17 and 18: 17 sample fruit that you prepared.
Page 19 and 20: 19 Lesson Four- Exploring Magnetism
Page 21 and 22: 21 8. Finally, have students remove
Page 23 and 24: 23 pH Scale & Cabbage Color Changes
Page 25 and 26: 25 11. Have students test the first
Page 27: 27 Materials o Goggles and Gloves o
Page 31 and 32: 31 Chemical Reaction Experiment (30
Page 33 and 34: 33 Materials o Goggles and gloves o

REED COLLEGE SCIENCE OUTREACH PROPERTIES OF MATTER

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