Reference no: EM132348512
1. A carbon atom, with a half-full outer shell of electrons - four in a shell that can hold eight - readily shares its electrons with other atoms and forms a vast number of molecules, many of which are the organic molecules that form the bulk of living matter. Looking at the periodic table in the Study Area, what other element do you think might play a role like carbon in life forms on some other planet?
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2. The atoms that constitute your body are mostly empty space, and structures such as the chair you're sitting on are composed of atoms that are also mostly empty space. So why don't you fall through the chair?
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3. Your friend says that the primary difference between a solid and a liquid is the kind of atoms in the material. Do you agree or disagree, and why?
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4. What happens to the density of water when it freezes to become ice?
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5. Why is it easier to start a fire with kindling rather than with large sticks and logs of the same kind of wood?
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6. Why is blood pressure measured in the upper arm, at the elevation of your heart?
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7. When an air bubble rises in water, what happens to its mass, volume, and density?
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8. Two identical balloons of the same volume are pumped up with air to more than atmospheric pressure and suspended on the ends of a stick that is horizontally balanced. One of the balloons is then punctured. Is the balance of the stick upset? If so, which way does it tip?
(Figure 1)
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8. Your friend says that what makes one element distinct from another is the number of electrons about the atomic nucleus. Do you agree wholeheartedly, partially, or not at all? Explain.
Essay answers are limited to about 500 words (3800 characters maximum, including spaces).