CSI Milford


Day 1 Report:

Observations

  • black marker ink
  • wants tickets
  • left glasses behind
  • white paper
  • thick ink

Background Information

  • a method for testing the purity of compounds and identifying substances
  • relatively quick
  • requires small quantities of material
  • components of the sample will separate readily according to how strong they absorb versus how readily they absorb in the mobile phase
  • stationary phase- high quality filter paper
  • moving phase- developing solution that travels up the stationary phase, and carries samples with it
  • a technique used to separate and identify mixtures that are or can be colored
  • received a black pen from kirschman, cravener, beil, hood, laguna, rhodes, and lancos

Instructions

Mixture- a substance made by mixing other substances together
Solution- a means of solving a problem or dealing with a difficult situation
Paper Chromatography- a form of partition in which the moving phase is a liquid and the stationary phase is paper
Fractional distillation- the separation of a liquid into fractions differing in boiling point by means of distillation

Materials:
  • chromatography paper
  • 250 mL beaker
  • graduated cylinder
  • pen samples
  • rubbing alcohol
  • ruler
  • pencil




Inferences or Hypothesis

My hypothesis is that we can figure out who did it by analyzing the identity of the marker each teacher gave us. I think it was Mr. Beil because he had a black marker in his shirt pocket, similar to the one that was used on the note, and he had an anti penguin sign in his room.

Day 2 Report:

Observations



Tests Performed

Paper Chromatography-
  • Cravener is a solution(has blue, orange, and black)
  • Kirschman stayed black
  • Rhodes is a solution(blue, pink, and black)
  • Laguna is a solution(black and blue)
  • Hood is a solution(black and blue)
  • Lancos is a solution(black, purple, and blue)
  • Beil is a solution(black, green, and blue)

Day 3 Report:

Observations

  • a big, cardboard penguin was found on the ground by the office
  • next to a beaker of clear liquid and a cup

Test Performed

  • First, we found the mass of an empty graduated cylinder
  • Then, we filled the graduated cylinder with the clear liquid 15 mL
  • Next, we weighed the full graduated cylinder
  • After that, we divided the mass and the volume to get the density

Data

Mass of empty graduated cylinder- 17.3 grams
Mass of full graduated cylinder- 30.4 grams
Density- 0.56 grams per milliliter

Pictures

science.jpg

Day 3 Report(Continued):

Observations

  • the longer the liquid boiled, the more the temperature increased
  • once the

Test Performed

  • First, we set up the lab the way it should be set up
  • Next, we poured 10 mL of the liquid, and placed 3 boiling chips inside a test tube
  • Then, we put the test tube in the test tube clamp, and filled a beaker with ice cold water
  • After that, we put a different test tube into the beaker full of water, and attached the black tubing from the test tube on the clamp to the test tube inside the beaker
  • Then, we lit the alcohol burner with a match and recorded the temperature of the test tube every 30 seconds

Conclusions


Day 4 Report:

Observations

  • the marker used to write the note, was the same marker used to write the note on cravener's whiteboard

Data

Time(Minutes)
Temperature(Degrees Celsius)
0:30
23
1:00
25
1:30
28
2:00
32
2:30
35
3:00
37
3:30
40
4:00
43
4:30
47
5:00
52
5:30
57
6:00
65
6:30
72
7:00
75
7:30
78
8:00
78
8:30
78
9:00
78
9:30
78
10:00
78
10:30
78
11:00
78
11:30
78
12:00
78
12:30
78
13:00
78
13:30
79
14:00
79
14:30
79
15:00
79
15:30
79
16:00
79

Pictures


May 16, 2014 7-50-48 AM.jpg