Purpose:
Using a 100 g hot brass mass (Tb) and 100 mL (g) lower temperature water (Tw) you will mix the two and measure the final temperature (Tf). Using the heat transfer equation you will calculate the heat capacity of the brass (cb). Once you have the correct heat capacity you will repeat the experiment to predict and confirm the final temperature with 200 grams of brass.

Procedure:
Fill a foam cup with 100 mL of room temp water from the tap using a graduated cylinder and place a thermometer in the cup.
Record temp (°C) of water. Tw = ________°C
Go to the container with the hot brass masses and record the temperature of the brass masses.
Tb = ________°C
Remove a 100 g brass mass with tongs and carefully and quickly place it into your cup of water. Slowly stir your water with the thermometer and record the temperature every minute for 10 minutes.
1)__°C 2)__°C 3)__°C 4)__°C 5)__°C 6)__°C 7)__°C 8)__°C 9)__°C 10)__°C
Use the highest temperature as your final temperature
Tf = ________°C
Using the heat transfer equation:
mc(Tf-Tw) = m(cb)(Tb-Tf)
and substituting known masses 100(1)(Tf-Tw) = 100(cb)(Tb-Tf)
use this equation (cb) = (Tf-Tw)/(Tb-Tf)
Show work:



(cb) = __________

Now that you have the heat capacity of brass (cb), predict the final temperature Tf of your water if you had added 200 g of brass to your 100 mL of water.

Tf = (200(cb)Tb + 100 Tw) / (100 + 200 cb)
Show work:

Tf = ___________(°C)

Repeat with new water and a 200 gram mass to verify:
1)__°C 2)__°C 3)__°C 4)__°C 5)__°C 6)__°C 7)__°C 8)__°C 9)__°C 10)__°C
Use the highest temperature as your final temperature

Tf = ___________(°C)
How close were you ? ________________

Finally, update your website with the details of this lab experience including a descriptive summary, all data, and conclusions! Show the instructor a hard copy of this experiment and your web synopsis. (Lab web entry graded according to this rubric).