Name

Period

Date

Absolute Zero Lab

OBJECTIVE

• Use Charles's Law to estimate absolute zero.

INFO

• absolute zero = -273^oC

MATERIALS

• 100-mL graduated cylinder, 2-L beaker, 2 thermometers
• hotplate

DATA

1. V₁ = mL
2. T₁ = ^oC
3. V₂ = mL
4. T₂ = ^oC

PROCEDURE

1. Fill the beaker with 1600 mL of cold water.
2. Fill the graduated cylinder with cold water.
3. Turn the graduated cylinder upside down into the beaker of water. (2-finger method)
4. Put a 40 to 50 mL bubble into the graduated cylinder. (2-finger method)
5. Put both thermometers into the beaker.
6. Align the water levels of the graduated cylinder and the beaker, and record the volume one (V₁).
7. Average the two thermometers and record temp one (T₁).

*** Back to Desks ***

1. Heat the beaker to about 30^oC to 40^oC.
2. Align the water levels and record volume two (V₂).
3. Average the two thermometers and record temp two (T₂).
4. Enter data into computer.
5. for each CALCULATION please
1. have adequate spacing

i. one point (out of 20)

2. number

i. one point (out of 20)

3. show all work

i. 6 points (out of 20)

CALCULATIONS

1. ∆V = mL
2. ∆T = ^oC
3. ∆T/∆V ratio = ^oC/mL
4. T_drop = V₁ x ∆T/∆V = ^oC
5. absolute zero = T₁ - T_drop = ^oC
6. % discrepancy = %