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Sue P.
University Student with three years of tutoring experience
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Basic Chemistry
TutorMe
Question:

The nuclide 232-Th is radioactive. When one of these atoms decays, a series of α and β- particle emissions occurs, taking the atom through may transformations to end up as an atom of 208-Pb how many α particles are emitted in converting 232-Th into 208-Pb?

Sue P.
Answer:

6 alpha particles were emitted. This can be calculated from the mass. The mass difference is 24. That means that there are 12 neutrons and 12 protons. Since every alpha particle has 2 protons, dividing 12 protons by 2 gives us 6. This means that 6 alpha particles were emitted.

Biology
TutorMe
Question:

Infection by a bacterium that has elements on its surface that enhance its resistance to lysozyme will likely result in...?

Sue P.
Answer:

successful reproduction of the bacterium and continued progression of the disease. The question states that the bacteria is able to resist being broken down by the body's lysozymes. If the bacteria is not broken and degraded, it is able to carry out reproduction and therefore allowing the disease to spread.

ACT
TutorMe
Question:

For all real numbers b and c such that the product of c and 3 is b, which of the following expressions represents the sum of c and 3 in terms of b ?

Sue P.
Answer:

(b/3)+3. Since we know that the product of c and 3 is b, we can write that as c*3=b. Now solve for c. We are looking for the sum of c and 3 in terms of b. We can now substitute (b/3) in for c in the expression c+3, giving us our answer.

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