Lab; Milk, Juice, Carrot

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

Hypothesis: I thought that after 3 days the milk would develop a very bad smell because it was not refrigerated.

Observations: After 3 days upon inspection of the milk I noticed no odor.

Change: After 3 days there were clumps in the milk.

Factors: I think I could call what I made cottage cheese.

Warm dark place

After three days

The finished product

Juice: Write your observations and explanation here.

Observations: Cup 1 (room temperature) seemed to diffuse the grape juice at a moderate rate, cup 2 (boiling water) diffused the grape juice faster than the room temperature water, cup 3 (ice water) diffused the grape juice slower than the room temperature water. I think that this was because the warmer the water is the more movement there is going on in it; whereas, the colder the water gets there is less movement until it becomes ice (solid).

Room temperature water

Boiling water

Cold water

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

Hypothesis: I thought that after 24 hours the carrot in the salt water would shrink while the carrot in the fresh water would expand. I believed this would happen because this was the way that it would work with a eukaratic cell in hypertonic and hypotonic solutions.

Observations: The tightness of the strings of both carrots was mildly tighter after being submerged for 24 hours. Though the carrot placed in the fresh water was 1/8 inch wider but the same length and the carrot placed in the salt water was 1/8 inch longer but the same width. This would imply that the string was tighter around the carrot placed in the fresh water but if it was it was not visibly noticeable.

Initial length and width of carrot pieces:

Piece 1:     The carrot piece placed in the fresh water was 2 ¾ inches long and 1 inch wide.

Piece 2:     The carrot piece placed in the salt water was 2 ¾ inches long and 1 inch wide.

After-experiment length and width of carrot pieces:

Piece 1:     After 24 hours the carrot piece placed in the fresh water was 2 ¾ inches long and 1 1/8 inch wide.

Piece 2:     After 24 hours the carrot piece placed in the salt water was 2 7/8 inches long and 1 inch wide.

The beginning

After measurements of carrot in salt water

   

Comparison of both pieces after 24 hours