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BIO240 Phoenix Biology Life On Earth Quiz Help

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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A substance with specific properties that cannot be broken down or converted into another substance is called a(n) A) element. B) molecule. C) ion. D) mixture. E) compound. Answer: A 2) If you examined the human body on a chemical composition basis, which of the following combinations of elements would be most common? A) C, N, Ca, S B) C, H, Ca, Cl C) O, C, N, Na D) O, C, P, S E) O, C, H, N Answer: E 3) The atomic number of an atom is defined as the A) total number of energy shells. B) number of electrons in the outermost energy level. C) number of protons in the atomic nucleus. D) total number of electrons and neutrons. E) number of neutrons in the atomic nucleus. Answer: C 4) Phosphorus has an atomic number of 15, so what is the distribution of its electrons? A) The first energy level has 2, the second has 8, and the third has 5. B) The first energy level has 8 and the second has 7. C) The first, second, and third energy levels have 5 electrons each. D) The first energy level has 2 and the second has 13. E) The electron arrangement cannot be determined from the atomic number alone. Answer: A 5) Which four elements make up approximately 96% of living matter? A) Carbon, oxygen, calcium, sulfur B) Carbon, sodium, chlorine, magnesium C) Carbon, phosphorus, hydrogen, sulfur D) Carbon, hydrogen, nitrogen, oxygen E) Oxygen, hydrogen, calcium, sodium Answer: D 6) Imagine that y ...
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