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# Tutor profile: Destiny L.

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Destiny L.
Undergraduate Research Assistant at Rensselaer Polytechnic Institute
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## Questions

### Subject:Pre-Calculus

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Question:

Find the average rate of change of the function y=2e^x over the interval from x=0 and x=2

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Destiny L.

The average rate of change will be found by f(2)-f(0)/2-0 ((2e^2)-(2e^0))/2 ((2e^2)-2)/2 therefore the answer is e^2 - 1

### Subject:Chemistry

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Question:

Determine the oxidation number of each element in this compound: NaHSO4

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Destiny L.

Any element in the 1A group is assigned a +1 therefore, looking at the periodic table, Na is assigned +1. H is assigned a +1 when mixed with nonmetals as seen here and a -1 when mixed with metals and boron. Elemental oxygen is always assigned a +2. This leaves Sulfur. Since all the on times the element subscript must add up to 0, S=0-(+1)-(+1)-4(+2) = +5 therefore S is assigned +5. (Don't forget to multiply by subscript (charge))

### Subject:Materials Science

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Question:

Please describe what happens in a material during elastic deformation and at the yielding point.

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Destiny L.

During elastic deformation, the bonds in the material will be stretched making them recoverable at any time. At yield point, you start to deviate from the linear region of the stress-strain curve and there is both stretching and breaking of bonds (elastic and plastic deformation) making some deformation non-recoverable.

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