Sunday, September 12, 2010

Physical and Chemical Properties of Marshmallows

     I chose to experiment with the chemical and physical properties of marshmallows because I decided it would be a fun, interesting, and safe experiment. I discovered five chemical properties and six physical properties of marshmallows. I tested four marshmallows for this experiment, and also included a fifth additional marshmallow that I left in it's original condition. First, I microwaved Marshmallow #1 for 30 seconds. The marshmallow expanded to roughly the size of a teacup and much of the marshmallow turned a brownish color. With Marshmallow #2, I placed it in a cup of hot water and after about three hours, it finally dissolved. Next, I put Marshmallow #3 in the freezer for two hours and it completely hardened. When I removed Marshmallow #3 from the freezer, i was able to use a hammer against it about five times before parts of the marshmallow began to crumble. Finally, I used a metal utensil to light Marshmallow #4 on fire. The marshmallow proceeded to turn black and the texture turned rough. The flame shut itself out, but not before the marshmallow had been burned. The chemical properties I observed include: 1) The ability to expand when heated (change in temperature); 2) The ability to change color when heated; 3) The ability to dissolve in hot water; 4) The ability to freeze; and 5) The ability to burn. The physical properties I observed include: 1) Color: white; 2) Density: marshmallow is less dense than water; 3) Conductivity: extremely poor; 4) Attraction to magnets: non-existent; 5) Malleability: slightly malleable when frozen; and 6) Hardness: very soft.

The following is an image containing the results of the experiment:


5 comments:

  1. Morgan-
    I think your idea of using a marshmallow was very interesting! Great idea! However, I don't think that the marshmallow completely dissolved in water, due to the picture, showing that solubility in water is not a property of a marshmallow. Also, the ability of a marshmallow to freeze is not a chemical property, it is a physical one, the freezing point. For your chemical experiments, you could have focused more on the four indicators, transfer of electricity, production of a new gas, change in color, and formation of a precipitate, to keep yourself in the right direction. Despite this, your experiment was well done and your picture was very helpful. Great job!

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  2. Morgan, the idea of a marshmallow was very good. A couple of suggestions: When explaining the experiment you performed it may have been easier to follow if you stated the chemical property directly under the experiment with a picture. Another thing I noticed was that on number four, ability to freeze is a physical property because that is the freezing point. I thought you had great ideas, but you could have explained more. Overall, you were very creative with your ideas and experiments, and a marshmallow was a good object to experiment with. Good Job!!
    Christina

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  3. Morgan, your idea for using marshmallows is AWESOME!However, I think the experiment would have been easier to follow for the reader if the picture was directly below each explanation of the chemical property. In addition, I really liked your picture though,the way you labeled each one was creative.I also agree with Emily and Christina, the ability to freeze would be considered a physical property because it is a change in state. Overall, great job!

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