# Tutor profile: Rutger F.

## Questions

### Subject: Basic Chemistry

You are setting up a chemical reaction in which compounds A and B are the reactants and compound C is the product. Compound A has a molar mass of 40 grams per mole and compound B has a molar mass of 20 grams per mole. If you add 60 grams of compound A and 80 grams of compound B, which compound is the limiting reagent? What is the theoretical yield in moles for compound C?

The reaction you are setting up is: A + B -> C. The limiting reagent is the compound present in the lowest quantity of moles. The number of moles of compound A is: 60 grams/40 grams per mole. This means you have 1.5 moles of compound A. The number of moles of compound B is: 80 grams/ 20 grams per mole. This means you have 4 moles of compound B. Therefore, compound A is the limiting reagent. This also means that the theoretical yield of compound C (the product) is 1.5 moles, which is equivalent to the amount of limiting reagent you have available.

### Subject: Biology

A biologist is looking at some cells of an unknown organism under a microscope. He sees the following cell structures: Mitochondria, Nucleus, Golgi Apparatus, Chloroplasts, Endoplasmic Reticulum, and Cytoplasm. Based on these observations, can the scientist distinguish if these cells are plant or animal cells? If so, what type of cells is the scientist observing?

Plant and Animal Cells have many similarities including, Mitochondria, Nucleus, Golgi Apparatus, Endoplasmic Reticulum, Cytoplasm, Lysosomes, and Peroxisomes. However, animal cells do not have chloroplasts while plant cells do. Therefore, the answer to the question is yes, the biologist can distinguish that he/she is observing plant cells because of the presence of chloroplasts. Chloroplasts are responsible for photosynthesis, which produces sugars for the plant and oxygen.

### Subject: Algebra

Steve's mom gives him 105 eggs. It takes 3 eggs to bake a cake. Steve wants to give each of his friends 3 eggs so that they can each bake a cake, but keep enough eggs for himself so that he can also bake 1 cake. How many friends can Steve give 3 eggs to? Create and equation and solve.

Steve starts out with 105 eggs. He wants to give 3 eggs to as many friends as possible while still having enough eggs to bake his own cake. Because it takes 3 eggs to bake a cake, Steve wants to have 3 eggs left over after giving eggs to his friends. The equation therefore is: 105 - 3x = 3. We are solving for x, which represents the number of friends Steve can give 3 eggs to. First, we subtract 105 from both sides. This yields: -3x = -102. Then we divide both sides by -3. This yields: x= 34. So, Steve can give 34 friends 3 eggs and still have 3 eggs left over to bake his own cake.