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# Tutor profile: Julianna B.

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Julianna B.
Former TA at Stanford University
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## Questions

### Subject:Chemistry

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Question:

How many grams of Cu(II) sulfate catalyst needs to be measured in order to have 1 mol% of the catalyst, given that the limiting starting material is 5 moles? How many mL of water need to be added to give a final concentration of solution at 0.5 M? The molecular weight of Cu (II) sulfate is 159.6 g/mol. The formula for molarity (M) is mol/L

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Julianna B.

This type of question would give me a heart attack during a test. But it can be answered by focusing on one part of the question and then moving through the different parts of the question until it is fully answered. First, it is important to realize how many moles of Cu(II) sulfate catalyst are needed. We know that this reaction requires 1 mol% of catalyst. If the limiting reagent is 5 moles, then we would need .05 moles of catalyst because .01 * 5 = .05. Now we know that we need just 0.05 moles of catalyst. To determine the number of grams needed, we will multiply 0.05 mol * 159.6 g/mol. Noticing that the moles cancel out, we just multiply across and are left with 7.98 g. To answer the next question, we know that we have 0.05 moles and we want 0.5 M. We can plug this into the equation 0.5 = 0.05/X. The X stands for the L needed to create the desired solution. By using simple algebraic rules we will want to isolate the X on one side which will lead to this equation X = 0.05/0.5. Therefore, we would need .1 L to create a solution of 0.5M. Although conversions seem tedious and irrelevant, this is the type of math I had to use to set up my reaction at work. It is possible that you will see conversions pop up in your life whether you like it or not. So might as well master it :)

### Subject:Biology

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Question:

What are the two organelles in an animal cell and three organelles in a plant cell that contain DNA?

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Julianna B.

In an animal cell, the nucleus and the mitochondria are the two organelles that contain DNA. In a plant cell, the nucleus, mitochondria, and chloroplasts are the three organelles that contain DNA. There is a special reason why... Although it is traditionally known that the nucleus contains all the cell's genetic information, other organelles also contain their own set of DNA. This is possible through a process known as endosymbiosis. Endosymbiosis occurred back in evolutionary time when a bacterium would engulf another bacterium. The bacteria that was engulfed later evolved to become a mitochondrion or a chloroplast while maintaining its own set of DNA. Today, both the mitochondria and chloroplasts are integral powerhouses of the cell. An animal cell contains only a mitochondrion while a plant cell contains both a mitochondrion and a chloroplast. The chloroplasts are organelles that promote photosynthesis enabling plants to produce food from sunlight.

### Subject:European History

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Question:

What were the impacts of the Black Death seen from a European perspective?

Inactive
Julianna B.

Although the Black Death ravaged Europe and decimated its population, there were some glimmering positive effects following the Bubonic plague that occurred in Europe. But how could that be? First, a decreasing population following the Black death meant that there was a shortage of cheap labor in Western Europe. This labor shortage gave power back to the rural laborers. These laborers could then demand wage increases. From 1340-1389, rural laborers gained a 40% increase in purchasing power. This increase in power led to the decline and eventual end of serfdom in Western Europe. By 1381, the Peasants' Revolt arose due to the socio-economic tensions from the aftermath of the Black Death. Many in the rural society thought the taxation system was unfair and rose in revolt against the unfree labor system, known as serfdom. While dates and specifics can be important in a historical context, historical trends are more crucial to understanding history. Key takeaways include the Black Death created a lack of free labor. Peasants could demand higher wages because the nobility needed people to work the land, and without the peasants there would be nobody to harvest their crops. This increase in wages caused tensions between the poor and wealthy eventually leading to a class war. This is seen throughout history amongst many different civilizations.

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