Milk, Juice, Carrots

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Answers

Record your answers here, space out as needed, and copy and paste them into your blog. Include three or so photos for each part to illustrate the process of the experiment. Thanks!

Milk: Record your hypothesis, observations, explanation, and factors here.

Hypothesis: I believe that, if the milk is left in a jar in a dark warm place for three days, then it will begin to spoil. I believe that its combination of ingredients will begin to separate.

Observations: The milk that had been sitting for three days had a very thick texture and the color was almost a yellow hue. Although the texture was still pretty smooth, I suspect that it would have become much more clumpy (like cottage cheese) if I had left it there for a longer period of time.

Explanation: When the temperature of the milk was raised, it accelerated the process of spoiling.

Factors: I believe the warm temperature, and the dark environment allowed the change in the consistency of the milk. I had the jar closed, so perhaps the lack of oxygen also assisted to the change.

Juice: Write your observations and explanation here.

In jar #1 (room temperature water) the juice seemed to quickly diffuse throughout the water. After it had been sitting for a few minutes, the juice seemed to be slightly heavier towards the bottom half of the jar.

In Jar #2 (iced water), when the juice was first poured in, it had sort of a glassy appearance. Again in this jar the juice seemed to diffuse throughout the jar. It seemed to be more evenly dispersed and also the color stayed much darker than in the other two jars. I can assume that the color remained darker because the proteins or molecules in the juice were not raised to a high temperature, which may cause the structure to denature.

In jar #3 (boiling water), when the juice was poured in, it seemed to diffuse very quickly. The color of the juice in the water was just a light red and was not nearly as dark as the ice water.

In my test, Jar 1 and 3 behaved in much the same way.

Carrot:  Record your hypothesis, tightness of string and texture observations and measurements, and what type of water caused shrinkage or expansion here.

Hypothesis: I believe that the carrot in the salt water will expand and I believe that the carrot in the fresh water will stay the same.

Initial length and width of carrot pieces:

Piece 1 – 10.5 cm in length and 2.8cm in diameter (placed in the fresh water)

Piece 2 – 11.6cm in length and 2.3cm in diameter (placed in the salt water.

After-experiment length and width of carrot pieces:

Piece 1 – 10.5 cm in length and  2.8 cm in diameter

Piece 2 – 11.4 cm in length and 2.1cm in diameter

My original hypothesis was half correct. I predicted that the carrot in the fresh water would stay the same. However, I believed that the carrot in the salt water would expand. This was incorrect. The carrot actually shrunk in both length and diameter.

I am now remembering the information from our recent chapter that explained how cells in to much salt will begin to shrick because they are trying to balance the environment.