Who's Worth More: Your Lil Brother or Lil Wayne?

We began class today by learning about percent composition in our notes packet. A percent composition compares the mass of each element present in 1 mole to the total mass of the compound.

Sample Problem:

Penicillin F has the formula C₁₄H₂₀N₂SO_{4. What is the mass percent of each element?}

To begin this problem, we calculated the total mass of the compound:

14 x 12 + 20 x 1 + 2 x 14 + 32 + 4 x 16 = 312 grams/mole

To determine the mass percent of Carbon, we multiplied the amount of carbon in the compound (which we used to determine the total mass of the compound) by 100 and divided by the total mass of the compound. We repeated this process with hydrogen, nitrogen, sulfur, and oxygen to find the rest of our results. We found the following:

Carbon had a mass percent of 53.8 %

Hydrogen had a mass percent of 6.4 %

Nitrogen had a mass percent of 8.9%

Sulfur had a mass percent of 10.3%

Oxygen had a mass percent of 20.5 %

After going over the notes, Mr. Lieberman introduced us to the 'How Much are You Worth?' project. The project asks us to calculate the cost of ourselves, a friend, family member, or favorite actor, although, of course, we are all priceless! We are to show all work in a factor-lable style, and are required to include a picture of our person. A maximum of 5 extra credit points can be given for creativity in your presentation style. Mr. Lieberman showed us some examples of cool projects that have earned students extra credit in the past, but remember that going above and beyond is not required.

Then we took our review quiz which we will have some time to finish in class tomorrow.

The % Composition Bubble Gum Lab is due tomorrow.

Web Assign is due Monday.

'How Much are You Worth?' project due Monday.

The Unit Exam is Thursday 10/28.

The next scribe is...Korri H!