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CHM105Spring2018_ObservationsofChemicalChanges_20400.pdf

CHM105Spring2018_ObservationsofChemicalChanges_20400.pdf -...

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Copyright 2017 - Hands-On Learning | http://holscience.com 1 / 7 Student Name levi johnston Student ID 20400 Lesson Observations of Chemical Changes Institution Rock Valley College Session CHM 105, Spring 2018 Course CHM 105, Spring 2018 Instructor Liz Hansen Final Report Exercise 1 CHM 105, Spring 2018 Observations of Chemical Changes I would mix an acid with it to see if it bubbled. 1. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). Using your results f rom Data Table 1 as a guide, how would you test this material f or the presence of sodium bicarbonate? AgNO + NaOH = AgOH + NaNO 2. Write the chemical equation f or the reaction in well A6. 3 3 A1. The observation of this reaction was a clear liquid and bubbles. 3. One of the reactions you observed resulted in this product: NaCl + H O + CO (g)? What well did this reaction occur in? Describe how the observations f or this reaction support your answer. 2 2
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Copyright 2017 - Hands-On Learning | http://holscience.com 2 / 7 I can assume that mixing any acid with phenolphthalein that it would turn pink. 4. You f ound a sample of a solution that has a f aint odor resembling vinegar (an acid). To verif y that it is vinegar, you add a f ew drops of phenolphthalein. T he sample turns pink. From this result, can you assume this sample is indeed vinegar or contains some vinegar? Explain your answer using your results f rom Data Table 1. I can assume that it is not starch. 5. While perf orming a starch test on several dif f erent cookie brands, f our tests result in the typical black color of starch presence, but the f if th gives a yellow-brown color.
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