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4-H National Youth Science Day

4-H National Youth Science Day. October 6, 2010. Welcome Experiment Facilitator!!. In your kit you’ll find a paper that says, “READ ME BEFORE YOU BEGIN.” Please do so.

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4-H National Youth Science Day

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  1. 4-H National Youth Science Day October 6, 2010

  2. Welcome Experiment Facilitator!! • In your kit you’ll find a paper that says, “READ ME BEFORE YOU BEGIN.” Please do so. • The CD contains a printable .pdf file of both the youth and facilitator guides. In addition there is information and handouts for youth, including the 4-H Inquiry in Action model and Intro to Inquiry text. Use these to give your science day event more impact. • The CD contains a PowerPoint presentation to use with youth. Feel free to modify it to meet the needs of your groups.

  3. What’s in the kit? • Bromothymol • Blue indicator • 3 Safety Goggles- to be shared by youth teams • 1 Eye dropper

  4. Use a syringe to measure- If you want additional materials, you can use a syringe- with the needle removed of course – to measure the 2 ml. portions of Bromothymol blue. These are available at feed stores for animal use.

  5. Here’s what you need to provide: • Protective gloves • Apron- large plastic garbage sacks will work • For Experiment Parts 1 & 2 Youth can work in teams of 2-3 learners. For each team: • 4 clear plastic cups • 2-3 flexible straws • 3 sandwich size zip seal bags • 2 packets of 2 each effervescent antacid tablets

  6. Shopping comparison- Although the Experiment information calls for 16 oz cups the 10 oz size will hold 8 oz of water or the equivalent of a 16 oz cup that is half full.

  7. Please read the MSDS* sheet on the Bromothymol Blue Indicator • Exposure Controls/Personal Protection- Page 4 of the Facilitator’s Guide Skin Protection: Wear protective gloves and clean bodycovering clothing. Eye Protection: Safety glasses. *MSDS: Material Safety Data Sheet

  8. Beef up the Science Bromothymol Blue turns yellow in the presence of an acid. • When CO2 dissolves in water, it reacts to form carbonic acid (H2CO3). The chemical formula looks like this: CO2 + H2O > H2CO3

  9. Beef up the Science Use the products below to show youth how Bromothymol Blue reacts to Acids and Bases before beginning the experiment: Acids- • pH 2 Lemon Juice- • pH 3 White vinegar • pH 4 Lemon-Lime soft drink • pH 5 Seltzer water • Neutral • pH 7 Water- tap or distilled • Bases • pH 8 Baking soda in water • pH 9 Antacid in water

  10. Use a control for this demonstration and compare it to the color change when youth do the experiment. Vinegar is an acid. The Bromothymol blue turns yellow in the presence of an acid. Baking Soda is basic = Blue

  11. Beef up the Science • Discuss the Carbon Cycle with Youth- • Plants capture sunlight in the photosynthesis process- Water + Carbon Dioxide + Sunlight Produces Glucose & Oxygen

  12. Beef up the Science • People are part of the Carbon Cycle. • Read the word document on the CD Can I Change the Ocean- Climate Chemistry for an explanation of weather, climate and climate chemistry. • Print the handout Carbon Cycle Youth Handout to discuss with youth. See the answers on the next slide.

  13. Carbon is in this form here: • _________Carbon Dioxide_________ • 2. Carbon is captured by plants with this process: • _____________Photosynthesis___________ • The apple contains this carbon containing material: • ___Carbohydrate_______________________ • 3. When the apple is eaten, carbon is released here by this process: • _______Digestion_______________ • 4. Carbon is released here by this process: Respiration________________________ 1 4 2 3

  14. Do the Experiment • Register your group at https://www.4-h.org/NYSD Print the handout Inquiry in Action for youth. Discuss how to design an experiment- Ask youth to develop an “If > Then” hypothesis. “If one person blows into the water for 30 seconds then this is what will happen….”

  15. Do the Experiment • Ask youth to list the Independent, Dependent and Controlled variable in their experimental design. • Independent variables answer the question “What do we change?” • Dependent variables answer the question “What do we observe?” • Controlled variables answer the question “What do we keep the same?”

  16. Do the Experiment The Independent Variable is the amount of CO2 in the water. The Dependent Variable is the change in pH of the water when CO2 is added. The Controlled Variable is the amount of water and Bromothymol Blue indicator in each cup.

  17. Do the Experiment Slowly blow bubbles into the cup. Be sure not to suck the fluid up the straw! The yellow color indicates that the water has become more acidic.

  18. Calculating a carbon footprint • Work with youth to fill in the blanks- you may wish to ask youth to collect some of this information with their parents before the activity. • Use the Gas Bill Handout on the CD to discuss Therms.

  19. Additional resources to use: • For more information and an animation on the carbon cycle see http://www.epa.gov/climatechange/kids/index.html, “Let’s Learn about the Carbon Cycle” • For more information and an animation on the water cycle see http://www.epa.gov/climatechange/kids/index.html, “Let’s Learn about the Water Cycle”

  20. Care for the Earth – it is the only one we have…..

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