New Microsoft Word Document (5) - PRINTED Biology Life on...

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PRINTED Biology: Life on Earth with Physiology Atoms, Molecules, and Life 2.1 Multiple Choice Questions 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) compound. E) mixture. Answer: A 2) If you examined the human body, which of the following combinations of elements would be most common? A) C, O, P, S B) C, Na, O, N C) Cl, Ca, C, H D) C, S, Ca, N E) O, N, H, C Answer: E 3) The atomic number of an atom is defined as the 4) Phosphorus has an atomic number of 15, so what is the distribution of its electrons? 5) Which four elements make up approximately 96% of living matter? 6) Imagine that you have been hired as a chemist and your first task is to examine a newly
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PRINTED discovered atom. The paperwork you are given states that its atomic number is 110. What does this mean? A) The atom contains 110 protons. B) The atom contains 55 electrons. C) The atom contains 55 protons and 55 neutrons. D) The atom is an isotope. Answer: A 7) Iron is an important element in human body cells. If iron has an atomic number of 26, what does this tell you about this element?
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PRINTED 8) Carbon-14 is often used for carbon dating, where scientists measure the rate of carbon-14 decay to determine the age of items. Carbon-14 contains six protons and eight neutrons. During the process of carbon-14 decay, one of its eight neutrons becomes a proton and an electron is emitted. Which of the following is the best explanation of what has occurred?
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