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# Tutor profile: Edith K.

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Edith K.
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## Questions

### Subject:Basic Chemistry

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Question:

Which element is oxidized? Which element is reduced? Cu(s) + 2 Ag+(aq) →Cu2+(aq) + 2 Ag(s) A. Cu(s) is oxidized; Ag+(aq) is reduced B. Cu(s) is reduced; Ag+(aq) is oxidized C. Cu2+(aq) is oxidized; Ag(s) is reduced D. Cu2+(aq) is reduced; Ag(s) is oxidized

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Edith K.

The answer is A: Cu(s) is oxidized; Ag+(aq) is reduced A easy way to remember this is OIL RIG (Oxidation is Loss of electrons and Reduction is Gain of electrons). Cu(s) is oxidized because it lost two electrons making it more positive (Cu2+) Ag+(aq) is reduced because it gained one electron making it more negative (Ag) Remember: electrons are negatively charged so gaining an electron will make the element more negatively charged while losing electrons will make the element more positively charged.

### Subject:Biology

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Question:

Ribosomes are platforms for making... a) RNA b) DNA c) Proteins d) tRNA

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Edith K.

Ribosomes are platforms for making proteins. During translation, mRNA is sent to ribosomes where they will be translated to protein. Translation will occur when a start codon (AUG) is located and the ribsomose will move across the mRNA until a reaches a stop codon.

### Subject:Algebra

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Question:

Josh decided to run 8 miles north and 10 miles west. What is the shortest distance that Josh needs to run to return to his starting point?

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Edith K.

This is a simple Pythagorean theorem question. Equation: A^2+B^2=C^2 The shortest distance would be to run diagonally (hypotenuse, C). 8^2+10^2=C^2 64+100=C^2 164=C^2 square root both sides the square root of 164 = 12.8 C = 12.8 Josh has to run 12.8 miles to get back to his starting point.

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