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Chemistry Cumulative Exam Review Questions and Answers 100% Pass
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Chemistry Cumulative Exam Review Questions and Answers 100% Pass What characteristic most uniquely defines a stable atom with a large nucleus? A) It has a greater number of neutrons compared to protons. In the photoelectric effect, what type of light is necessary to eject electrons from a m...

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  • July 25, 2024
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  • 2023/2024
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1 Chemistry Cumulative Exam Review Questions and Answers 100 % Pass What characteristic most uniquely defines a stable atom with a large nucleus? ✔✔A) It has a greater number of neutrons compared to protons. In the photoelectric effect, what type of light is necessary to eject electrons from a metal? ✔✔B) Light of any intensity above a certain threshold frequency. How does the modern quantum atomic model differ from John Dalton's model? ✔✔C) The modern model includes the concept of subatomic particles, whereas Dalton's model does not. What was J. J. Thomson's key finding when he applied an electric current to a cathode ray tube? ✔✔B) The glass opposite the negative electrode began to fluoresce. A chromium atom has a mass number of 52 and contains 24 protons. How many neutrons are present in this atom? ✔✔B) 28 2 Which property is most useful for identifying an element? ✔✔B) The number of protons in the atom's nucleus. John Da lton’s research on atomic theory helped clarify which scientist’s law about the ratio of masses in compounds? ✔✔D) Joseph Proust Which of the following is a key element of John Dalton’s atomic theory? ✔✔C) Atoms are indivisible particles. If an electron transitions from the third to the first energy level in one hydrogen atom, and from the second to the first level in another hydrogen atom, which statem ent is true? ✔✔A) The first atom releases light with higher energy. Which model most accurately represents the atomic structure derived from Rutherford's gold foil experiment? 3 ✔✔A Potassium -40 (K -40) has 19 protons and 21 neutrons. After its decay, which atomic symbol could represent the resulting isotope? ✔✔A) 40/18 Ar Given the following data to determine the average atomic mass of element B: - Isotope | Atomic Mass (amu) | Relative Abundance (%) - B-10 | 10.01 | 19.91 - B-11 | 11.01 | 80.09 What is the computed average atomic mass of element B from this information? ✔✔C) 10.81 Albert Einstein's explanation of the photoelectric effect was base d on ideas from which scientist? ✔✔C) Max Planck 4 A student makes the following observations about mass defect and nuclear binding energy: 1. A small amount of mass is converted to energy when protons and neutrons form a nucleus. 2. An equivalent amount of energy is needed to break apart the nucleus into protons and neutrons. 3. The first observation pertains to nuclear binding energy, while the second relates to mass defect. Which of these observations are correct? ✔✔C) Obser vations 1 and 2 are accurate. In which isotope is the strong nuclear force insufficient to counteract the repulsive electrostatic forces between protons? ✔✔D) Uranium -238 (Elements and the Periodic Table) Which property would xenon most likely have? ✔✔A) It is stable (Elements and the Periodic Table)

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