(WCSP25) Shown below are a series of interacting charged particles.  One pair is 1 unit of distance (denoted ‘d’) apart, another is 2d and the other 3d units apart.  Select the system that has the lowest electrostatic potential energy.   Data Sheet

13. There are two isotopes of helium: helium-3 and helium-4.  3He is proposed to be a safer nuclear fuel compared to uranium and plutonium.   It has been suggested that the moon could be mined for helium-3. (WCSP, 9 points)  Table 1: Isotopes of helium and abundance on the moon. Isotope Mass abundance 3He 3.016 amu ? 4He 4.003 amu 3.66% a.  What is the percent abundance of helium-3 on the moon? b.  What is the average atomic mass of helium on the moon?  (show all work for full credit) c.  Given the atomic mass of helium on the periodic table, what isotope is more abundant here on earth?  Explain in a few words (no calculation).   Periodic Table Data Sheet Enter the value for part b in the box below.   

(WCSP25) Select all of the following that are true about the orbital with the following quantum numbers: n = 2,   

15. NASA detected a burst of gamma rays from a neutron star in space. The gamma radiation had a frequency of 1.0 × 1019 Hertz and the burst released a total of 1.0 × 1044 J of energy.  (WCSP, 10 points)  a. What is the wavelength of radiation emitted in m? b. How many moles of photons are released during the burst?   Periodic Table Data Sheet Enter the value for part b in the box below.   

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T3 (triiodothyroxine) is secreted by the:

Glucagon and insulin both target the cells of the liver and are both made in the pancreas, explain how they regulate blood sugar level giving real life examples 

Select the correct answer to the following. Which type of drawing is illustrated in the image below?

Fill-in-the blanks with the correct answers to complete the following. Check your spelling, sentence case, and subject-verb agreement. Incorrect responses will not earn credit. Do not capitalize words that do not begin sentences and/or are not proper nouns. Do not place a space after hyphens. Secondary colors are formed by mixing two primary colors together. These colors are , , and .