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Vinegar bakingsodalab 10.1

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Vinegar bakingsodalab 10.1

  1. 1. What’s the Matter?! Acid + Powder Investigations 10.1 Spedding Grade 5 PYP The International School of Monterey INVESTIGATION 1 1. What are the physical properties of the acid? 2. What are the chemical properties of the acid? 3. What do you observe when you add acid to the powder? Be specific. INVESTIGATION 2 1. Predict what would happen if you add a little bit of liquid soap to the acid + powder mixture? Try the following experiment: = dip a strip of paper towel into the water + liquid soap mixture = drop the strip into a beaker = add 4 tablespoons of powder to the beaker = pour 200 ml of acid into the beaker = DANGER! STAND BACK!! 2. What happened when you added the vinegar to the soap + powder mixture. What did you observe? Be specific. 3. Was this a physical change, a chemical change, or both? Explain.
  2. 2. INVESTIGATION 3 1. Predict what would happen if you placed a balloon over a flask after you create an acid + powder mixture. Try the following experiment: = pour 100 ml of acid into the small flask = add 2 tablespoons of powder to a balloon = holding the balloon so the powder stays inside of it, fit the elastic mouth of the balloon over the top of the flask. Lift the head of the balloon, and gently shake it so all the powder falls out into the acid. Hold the balloon on the flask so it doesn’t pop off. = WATCH WHAT HAPPENS!! 2. What happened when you added the acid to the soap + powder mixture. What did you observe? Be very specific. 3. Was this a physical change, a chemical change, or both? Explain. INVESTIGATION 4
  3. 3. QUESTION: What is the ideal ratio of acid and powder to create the most carbon dioxide? HYPOTHESIS (your guess): EQUIPMENT (what you need) flask, powder, acid, balloon, graduated cylinder, string, ruler PROCEDURE (what you should do) 1. Pour out one tablespoon of powder into a balloon. 2. Measure out 80 mL of acid and pour it into the flask. 3. Holding the balloon so the powder stays inside, fit the elastic mouth of the balloon over the top of the flask. 4. Lift the head of the balloon, and gently shake it so all the powder falls out into the acid. Hold the balloon on the flask so it doesn’t pop off. 6. Wait a 5 minutes then measure the circumference of the balloon with a string. Measure the length of the string (in cm) with a ruler. 7. Rinse out the flask then repeat steps 1-6 with different amounts of acid & powder (see the table below). Record the circumference of the balloon each time. Trial Acid Powder Circumferences of balloon (cm) 1 80 ml 1 tbsp 2 240 ml 3 tbsp 3 240 ml 1 tbsp 4 80 ml 3 tbsp DATA ANALYSIS What does your data show? CONCLUSION Was your hypothesis correct/incorrect? Explain. Is there a way you might modify this experiment or design a new experiment? INVESTIGATION 5: The Balloon BOMB!
  4. 4. 1. Predict what would happen if your created an acid + powder mixture in a sealed zip-lock sandwich bag? Try the following experiment: = add 2 tablespoons of powder to a paper towel pouch = pour 100 ml of acid and 50 ml of warm water to a zip-lock sandwich bag = carry the bag outside to our explosion area = drop the pouch into the bag, seal the bag QUICKLY = shake the bag, place on the ground QUICKLY = STAND BACK!! 2. What happened when you added the vinegar to the soap + powder mixture. What did you observe? Be specific. 3. Was this a physical change, a chemical change, or both? Explain.

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