4. Propose an explanation for the observation that elements with even
5. During the lifetime of a star, different reactions that form different elements are used to power the fusion furnace that keeps a star “lit.” Explain the different reactions that dominate in the different stages of a star’s life cycle and their effect on the temperature of the star.
6. A line in a popular song from the 1960s by Joni Mitchell stated, “We are stardust….” Does this statement have any merit or is it just poetic? Justify.
7. If the laws of physics were different and the primary element in the universe were boron-11 (Z = 5), what would be the following four most abundant elements? Propose nuclear reactions for their formation.
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