25 Prepare Ahead ID: 246410
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25 otion Commotion Prepare Ahead Try the activity yourself, so you can anticipate where kids may get stuck or need guidance. Photocopy the reproducible data sheet on p. 43; one copy per kid. Note that the activity calls for baking soda, not baking powder. On the day of the activity, set up work areas. Each kid should have four cups, a data sheet, and a pencil. Each work area should have a bottle of oil, a bottle of vinegar, a bottle of water, a bowl (and spoon) with baking soda, a bowl with effervescent tablets broken into quarters, a box of food coloring, and a roll of paper towels for potential spills. Lead the Activity Introduce Ruffs challenge. (5 minutes) Hand out the activity sheets and tell kids that today theyll be doing a chemistry activity that involves predicting, testing, observing, and recording results. Theyll write their observations on a data sheet. Set up the experiment and pour the liquids. Have kids follow step 2 of the activity sheet. Emphasize the labels on the data sheet. Setting up an experiment properly is part of being a scientist. Pause, observe, and discuss. Once kids have added oil, water, and vinegar, ask them: What do you notice about the liquids? separated into layers.) Which liquid is on top? Explain that some liquids dont mix, like oil and water, or oil and vinegar. Explain that liquids can have different densities, which means some are heavier than others. Which liquid is the lightest, or least dense? How do you (The oil is lightest, because it oats on top). 1 activity sheet for each kid data sheet (1 per kid; see p. 43) vegetable oil (1 bottle per work area) white vinegar (1 bottle per work area) water (1 bottle per work area) baking soda (1 bowl per work area) plastic spoons box of effervescent tablets (like Alka Seltzer®) bowls for baking soda and effervescent tablets (1 each per work area) boxes of food coloring (1 per work area) clear plastic cups (4 per kid) pencils (1 per kid) paper towels (1 roll per work area) chart paper and markerGrades K 4Science as Inquiry: abilities necessary to do scienti c inquiry; understanding about scienti c inquiryPhysical Science: properties of objects and materialsGrades 5 8Science as Inquiry: abilities necessary to do scienti c inquiryPhysical Science: properties and changes of properties in matterTM/© 2010 WGBH Educational Foundation. zzing and otion Commotion Potion Commotion See p. 43 Data Sheet Potion Comm Potion Commotion & Baking SodaOil and Water& Effervescent TabletOil and Water& Baking SodaOil and Vinegar& Effervescent TabletName: TM/© 2010 WGBH Educational Foundati 26 Next, have kids add drops of food coloring without stirring. Then ask: What happened? (After a while, the drops sank down to the vinegar and water layers and mixed in with those liquids.) Did all the liquids change color? (No. Only the water and the vinegar, not the oil. Little beads of color stayed in some of the oil.) Why did the food coloring mix just with the water and the vinegar? Whats the rst ingredient listed on the box of food coloring? (Waterthats why it wont mix with oil.) Create chemical reactions. (10 minutes) Before having kids add the effervescent tablets and the baking soda, have them predict what will happen. Then have them add the tablets and powder as instructed, and record their observations on the data sheet. Discuss what happened. Gather as a group and draw the data sheet on your chart paper. Fill out the chart paper together using kids observations. Ask: Whats bubbling and zzing a sign of? theyve done the Tempest in a Teacup chemistry activity (p. 19), theyll know bubbling is a sign of a chemical reaction and that a gas has been produced.) Did every cup produce a chemical reaction? (No, the oil and water plus baking soda What can you conclude about those (Water and baking soda dont produce a chemical reaction.) What is lighter (less dense): the liquids in the cups or the gas? How do you know? (Because the gas formed bubbles and oated up to the surface, which means the gas is lighter.) Award Points. (5 minutes). Time to rack activitys keby asking the following questions, worth 50 points each.Do you think food coloring is water-soluble (able to mix with water) or oil-soluble (able to mix with oil)? Why? (Its made with water, so its water-soluble.)Did you see anything today that let you know a chemical reaction happened? bubbling, which means that a gas is produced.) Did you see anything today that did not produce a chemical reaction? How do you (The oil and water plus baking soda didnt reactthe powder dropped to the bottom and sat thereno zzing or bubbling occurred.)Which of these is the most dense, or heaviest water, oil, or (Water) Which is the least dense, or lightest? (Gas bubbles)When scientists experiment, they make predictions and observations and record what they see. Give an example of when you did each one of those things. (Answers will vary.) Allow extra time to dispose of the liquidsthis activity can get messy. The oil can be funneled into bottles and reused with another group. 6 Tell kids to keep mixtures away from their clothes, them wear protective goggles, if available. Fizzing, bubbling, place; sometimes bubbling at first, chemical reaction. Fizzing, bubbling, water; sometimes The most fizzing, bubbling; cloudy; droplets of cup; lasts the Data Sheet Answer Key (see p. 43 for a reproducible copy) Activity Sheet vegetable oil white vinegar water baking soda effervescent tablets (like Alka Seltzer®) food coloring 4 clear plastic cups pencil paper towels data sheet (see below) Line up four cups in front of your data sheet. Add about an inch or two of oil to all four cups. Add about an inch or two of water to the two cups in front of the oil and water labels. Add about an inch or two of vinegar to the other two cups labeled oil and vinegar. What do you notice about the oil, water, and vinegar? Add three drops of food coloring to each of the four cups. Do not stir. What do you observe now? 1 Predict what will happen if you add a piece of the effervescent tablet to one cup of oil and water and a piece to one cup of oil and vinegar. Add the effervescent tablet, and write or draw your observations on the data sheet. Predict what will happen if you add a spoonful of baking soda to the two remaining cups. Add the baking soda, and write or draw your observations on your data sheet. You can techemical rehas taken place if you see zzing or bubbling. Describe what you see. Was there a chemical reaction in each cup? 4 otion Commotion zz factor! oats oated to the top, bringing TM/© 2010 WGBH Educational Foundation. Keep mixtures away and mouth. No tasting! ion Commoti Potion Commotion & Baking SodaOil and Water& Effervescent TabletOil and Water& Baking SodaOil and Vinegar& Effervescent TabletName: TM/© 2010 WGBH Educational Foundation. Fold FETCH! is produced by WGBH Boston. Major funding for Fetch! is provided by the National Science Foundation and public television viewers. Corporate funding is provided by Chuck E. Cheeses®. This Fetch! material is based upon work supported by the National Science Foundation under Grant No. 0840307. Any opinions, ndings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily re ect the views of the National Science Foundation. This Fetch!material, when being used by a school, must be made school district using it for inspection by parents or guardians of children engaged in educational programs or projects using such material of that school district. © 2010 WGBH Educational Foundation. All rights reserved. FETCH!, the characters, and related indicia are trademarks of the WGBH Educational Foundation. All third party trademarks are the property of their respective owners. Used with permission. Harry and Hermione are characters in J.K. Rowlings Harry Potter series. Dig Deeper Create colorful layers of liquidswho knew that oil, water, and corn syrup could look so good! Add red food coloring to the corn syrup and blue to the water. Then pour the oil, water, and corn syrup into a with the densest (heaviest) on the bottom and the lightest on top. Use what you learned while doing Potion Commotion to predict the correct order to pour them in. Which do you think is densertap water or salt water? Find out by trying this ZOOM activity: pbskids.org/zoom/activities/sci/waterdensity.html id You Know? Water and oil seem like sworn enemies, but soap loves them bothand it can even make them get along! Soap is an emulsi er, which means it can mix two unmixable liquids. To clean a greasy dish, water alone wont work. But if you add soap, the soap will cling to both grease and water, allowing the water to rinse away the grease. otion ommotion Commotion G o o o ETCH! FETCH! and visit the FETCH! Web site at pbskidsgo.org/fetch. Data Sheet otion Commotion Potion Commotion Oil and Vinegar& Baking SodaOil and Water& Effervescent TabletOil and Water& Baking SodaOil and Vinegar& Effervescent TabletName: TM/© 2010 WGBH Educational Foundation.