Thursday, September 9, 2010


The house product i used was a pretzel. Pretzels are one of my favorite snacks and you would be surprised what what you could to make it taste better. Just kidding, whatever i do, do not eat it, it would taste disgusting.

Physical properties include: 
1. the pretzel is brown
2. Solid at room temperature
3. easily broken in half.

4. easily broken into crumbs

5. the salt on the pretzel dissolves in water

Chemical properties include:
1.Pretzel burns but does not leave ash. Around the burned area, small cracks where observed.
2. Reacts with vinegar and causes the pretzel to be white, and very fragile. All of the salt dissolved.
3. Reacts with pickle juice and turns the pretzel a little bit green, and causes the salt to dissolve. It also caused the pretzel to expand. (picture above)

4. Water causes the pretzal to be very smooth, but does not effect it. only dissolves salt.
5. Sprite causes the pretzel to turn a white color, and when the pretzel was added to the sprite, it fizzed which means a gas was produced. The pretzel became very squishy, looked really clean, and felt like a worm.
My conclusion is that, every time I add a light acid, like vinegar or pickle juice, it does not change state, but changes texture according to the light acid. Every time you add a liquid to a pretzel, the salt will dissolve. So keep your pretzel salty!


  1. I really liked your choice to use pretzels, because it's original. On your pickle juice lab I don't think the change in color isn't a chemical change, because it's more like food coloring in water. But the salt dissolving is, because it's composition is breaking down. Overall it was really good, but I think it would of been better if you had explained more as to why it was a chemical change.

  2. I was astonished that the pretzel did not create ashes when you burned it. Most of your explanations were good but some of them could have used a little more details. I also really liked the idea of using a pretzel.

  3. Great job, I liked the originality of your topic and the experiments you conducted. I do however, feel that at some points you stretched out one property and put it down as two so that you would have the required five. for example, I think your properties of how it can be broken and half and how it can be crumbled both fall under how brittle the pretzel is.Because it is brittle it is easy to break, but I fell that those two should have just been one physical property stating that the pretzel was brittle. If you made it one then you would have had four and for the fifth one you could have expanded on the mass or density of the pretzel. I also feel that your last physical property about the salt dissolving off the pretzel in water is more a statement towards that solubility of salt than anything else. I feel that that property is a property of the salt, not the pretzel itself. Overall though, I think you did a great job and picked a creative topic.

  4. The pretzel was a really good idea. I thought that you came up with some pretty creative ways to test chemical reactions, and you did a very good job explaining your chemical changes. For your physical properties, I thought you named some pretty important properties, and my my only suggestion would have been to maybe use more scientific terms to help your description. Such as on physical property number four, you should have said, "Non- malleable." Also you should have said it was brittle instead of just saying it was easy to break in half. It would have been cool if you showed a picture of the the pretzel without salt on it! You did a great job!!!