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Tutor profile: Cecelia D.

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Cecelia D.
Experienced biology student
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Questions

Subject: Chemistry

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Question:

Chlorine has a relative atomic mass of 35.45 g/mol. There also exists isotopes of chlorine, Cl-35 and Cl-37, each with the atomic masses of 34.97 and 36.97 g/mol, respectively. What is the relative abundance of Cl-37?

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Cecelia D.
Answer:

Consider this to be a simple algebra problem. X = abundance of Cl-35 Y = abundance of Cl-37 We know that: 34.97x + 36.97y = 35.45 x + y = 1 We want to solve for y. x = 1 - y, we then substitute in the top equation. 34.97(1 - y) + 36.97y = 35.45 Then simplify: 2y = 0.48 y = 0.24 The relative abundance of Cl-37 is 24%

Subject: Basic Chemistry

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Question:

Balance the following equation: _CO2 + _H2O -> _C6H12O6 + _O2

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Cecelia D.
Answer:

A good trick to balancing equations is to initially pick a molecule to have a coefficient of 1, then balance out the rest to be equal to it. For this, we will make C6H12O6 have coefficient of 1. We then look at CO2, which has 1 carbon, to make it balanced, there needs to be a coefficient of 6. Then H2O, which has 2 hydrogens, but to be equal to C6H12O6, also needs a coefficient of 6. We then have everything except for the number of O2 in the products. Add the number of O on the reactants side. This is 18. Then subtract the product we already know, C6H12O6, which has 6 oxygen atoms. This leaves 12, but since it is O2, you must divide by 2, which leaves you with 6. The balanced equation is then: 6CO2 + 6H2O -> C6H12O6 + 6O2

Subject: Biology

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Question:

Name three skeletal features that distinguished mammals from their now-extinct ancestors, synapsids.

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Cecelia D.
Answer:

Mammals are known for their enlarged dentary bone (mandible), whereas synapsids had several smaller bones as part of their jaw, specifically used for articulation. Mammals also have dentary-squamosal articulation, while synapsid jaw articulation occurred with smaller bones known as the quadrate and articulate. These bones shifted in mammals to their inner ear. Mammals have 3 ossicles (inner ear bones) and the synapsids just had one, the stapes.

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