Logan Brink
Kemper p.6
Chemistry
January 11, 2014
Grams Ahoy!
Purpose: The purpose of this lab is to find the weight (in grams) of the chocolate in a chocolate chip cookie.
Hypothesis: If the chocolate is separated from the cookie, then the chocolate will weigh 40% of the weight of the whole cookie.
Materials:
* 1 chocolate chip cookie * 2 plastic trays * 1 pair of tweezers * 1 gram scale
Procedures:
I. Weigh chocolate chip cookie on the gram scale and record. II. Weigh plastic tray and record. III. Separate chocolate from cookie in separate trays. IV. Weigh chocolate in tray and record. V. Subtract weight of the tray by total weight of the chocolate in the tray to find the weight of the chocolate. VI. Divide weight of chocolate by total weight of cookie. VII. Multiply weight by 100 to find the percentage of chocolate in the chocolate chip cookie.

Data/Calculations:
-Weight of chocolate chip cookie: 10.55
-Weight of plastic tray: 2.17
-Weight of plastic tray and chocolate: 4.59
-Weight of chocolate: 2.42
-Percentage of chocolate in 1 chocolate chip cookie: 22.94%

Conclusion: My hypothesis was that 40% of the weight of the cookie would be chocolate. In conclusion, my hypothesis was not supported by the data in which the cookie’s weight contained 22.94% chocolate. An error that occurred in the procedure was the fact that I wasn’t able to fully separate the cookie crumbs from the chunks of chocolate. Improvements that could have made the data more reliable would have been to separate the chocolate from the cookie entirely. Further research question I would test would be to find out how much sugar each cookie