Observations of physical and chemical c free essay

To verify that it is vinegar, you add a few drops of phenolphthalein. The sample turns pink. From this result, can you assume this sample is indeed vinegar or contains some vinegar? Explain your answer using your results from Data TABLE 1. E. While performing a starch test on several different cookie brands, four tests result in the typical black color of starch presence, but the fifth gives a yellow-brown color. How might you interpret this result? F. You have read that a new brand of hair tonic is supposed to contain lead (an ingredient in Grecian [email protected]).

Devise a simple test to confirm the presence or absence of lead in that hair tonic. Use your observations in Data TABLE 1 to describe a positive result for this test. G. Is cutting a cake into 8 pieces a chemical or a physical change? Explain your answer. H. When a soda is poured into a glass and the soda bubbles, is it the result of a chemical change? Explain your answer. I. In well Bal, what was the reactant in the second step? Did this reactant cause a chemical change? Use your observations to support your answer. J. Think about how phenolphthalein acts as an acid/base indicator.

Do your observations in well AY support this or contrast what you would expect to happen? Explain your answer. K. Identify the following as examples as either Physical or Chemical changes: a. Baking muffin batter to make muffins. B. Combining dry ingredients (flour, salt, sugar, baking soda) to make muffins. C. Shredding paper. D. Burning paper. E. Cooking tomatoes to make tomato sauce. F. Chopping tomatoes. G. Peeling apples. H. Apple slices turning brown in the air. Exercise 2: Heating and Combustion Data TABLE 2. Heating and Combustion. Chemical Initial Observations

Heating Observations Burning Observations MGM Zen chuck A. Describe the similarities and/or differences between heating and burning the magnesium metal. Did either heating or burning produce a chemical change? Explain your answer using the observations collected in Data TABLE 2. B. Describe the similarities and/or differences between heating and burning the mossy zinc metal. Did either heating or burning produce a chemical C. Describe the similarities and/or differences between heating and burning the Cue(NON)2. Did either heating or burning produce a chemical change?

Explain your answer using the observations collected in Data TABLE 2. D. Describe the similarities and/or differences between heating and burning the Chuck. Did either heating or burning produce a chemical change?

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