Chemistry Practice Test Questions Trivia Quiz
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All isotopes of tin have the same I. number of protons. II. number of neutrons. III. mass number
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I only
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II only
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III only
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D. I and III only I and III only
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- 2.
Which of the following particles contain more electrons than neutrons? I. 11H II 3417Cl- III 3919K+
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I only
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II only
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I and II only
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II and III only
Correct Answer
A. I onlyExplanation
Chlorine-34 has 17 protons and 17 neutrons. The chloride ion has an additional electron, giving it 18 electrons, resulting in a full valence shell for enhanced stability. Chlorine typically gains this electron during reactions to form ionic compounds like sodium chloride.Rate this question:
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- 3.
Isotopes of an element differ in their:
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Atomic number
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Position in the Periodic Table
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Number of neutrons
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Electronic arrangement
Correct Answer
A. Number of neutronsExplanation
Isotopes of an element differ in their number of neutrons. Isotopes are atoms of the same element that have different numbers of neutrons, resulting in different mass numbers. The atomic number remains the same for all isotopes of an element, as it is determined by the number of protons in the nucleus. The position in the periodic table and electronic arrangement are also the same for isotopes of an element, as they are determined by the number of protons and electrons. Therefore, the number of neutrons is the only characteristic that differentiates isotopes of an element.Rate this question:
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- 4.
Isotopes of an element have the same number of
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Protons and electrons
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Neutrons and electrons
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Protons and neutrons
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Protons, neutrons and electrons.
Correct Answer
A. Protons and electronsExplanation
Isotopes of an element have the same number of protons and electrons because they are different forms of the same element, meaning they have the same atomic number. However, isotopes have different numbers of neutrons, resulting in different atomic masses.Rate this question:
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- 5.
Which species have electronic configurations 2.8.8, 2.8 and 2.8.1 respectively?
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Ne, F, Na
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K+, F- , Mg2+
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Ca2+ , F, Na+
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Cl- , F- , Na
Correct Answer
A. Cl- , F- , NaExplanation
The species with electronic configurations 2.8.8, 2.8, and 2.8.1 respectively are Cl-, F-, and Na. This is because the electronic configuration of Cl- is 2.8.8, F- is 2.8, and Na is 2.8.1. The numbers represent the number of electrons in each energy level, with the first number representing the number of electrons in the first energy level, the second number representing the number of electrons in the second energy level, and so on.Rate this question:
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- 6.
What information about the structure of a hydrogen atom can be gained from its emission spectrum?
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Most of the mass of the atom is in its nucleus
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A hydrogen atom contains one proton and one electron.
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The electron in the hydrogen atom is held near the nucleus.
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The electron may exist in any of several energy levels.
Correct Answer
A. The electron may exist in any of several energy levels.Explanation
The emission spectrum of a hydrogen atom provides information about the energy levels that the electron can occupy. Each line in the spectrum corresponds to a specific transition of the electron between energy levels. This indicates that the electron is not confined to a single energy level, but can exist in different energy states. This observation supports the idea that electrons in atoms are quantized, meaning they can only have specific energy values.Rate this question:
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- 7.
Spectra have been used to study the arrangements of electrons in atoms. An emission spectrum consists of a series of bright lines that converge at high frequencies. Such emission spectra provide evidence that electrons are moving from
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Lower to higher energy levels with the higher energy levels being closer together.
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Lower to higher energy levels with the lower energy levels being closer together.
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Higher to lower energy levels with the lower energy levels being closer together.
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Higher to lower energy levels with the higher energy levels being closer together.
Correct Answer
A. Higher to lower energy levels with the higher energy levels being closer together.Explanation
Emission spectra are produced when electrons in higher energy levels transition to lower energy levels, releasing energy in the form of light. The convergence of bright lines at high frequencies indicates that the energy levels are closer together at higher energies. Therefore, the correct answer is that electrons move from higher to lower energy levels with the higher energy levels being closer together.Rate this question:
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- 8.
Consider the composition of the particles W, X, Y, Z below. Which two particles are isotopes of the same element? Particle Number of protons Number of neutrons Number of electrons W 11 12 10 X 12 12 12 Y 12 13 12 Z 13 14 10
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W and X
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X and Y
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Y and Z
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W and Z
Correct Answer
A. X and YExplanation
Particles X and Y are isotopes of the same element because they have the same number of protons (12) but different numbers of neutrons (X has 12 neutrons, Y has 13 neutrons). Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons.Rate this question:
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- 9.
What is the electron configuration of an atom of element 20?
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8.8.4
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4.8.8
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2.8.10
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2.8.8.2
Correct Answer
A. 2.8.8.2Explanation
The electron configuration of an atom of element 20 is 2.8.8.2. This means that there are 2 electrons in the first energy level, 8 electrons in the second energy level, 8 electrons in the third energy level, and 2 electrons in the fourth energy level.Rate this question:
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- 10.
Isotopes of an element have the same
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Number of protons and neutrons
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Number of protons and electrons
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Atomic number
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Atomic number and mass number
Correct Answer
A. Atomic numberExplanation
Isotopes of an element have the same atomic number The atomic number represents the number of protons in the nucleus of an atom, which remains the same for all isotopes of the same element. The mass number represents the total number of protons and neutrons in the nucleus, which can vary among different isotopes. Therefore, the correct answer is atomic number.Rate this question:
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- 11.
Which electron transition in the hydrogen atom releases the most energy?
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N=2→ n = 1
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N=3→ n = 2
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N=4→ n = 3
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N=5→ n = 4
Correct Answer
A. N=2→ n = 1Explanation
The electron transition from n=2 to n=1 in the hydrogen atom releases the most energy because it involves the electron moving from a higher energy level (n=2) to a lower energy level (n=1). As the electron moves closer to the nucleus, it experiences a stronger attraction and therefore releases more energy in the form of electromagnetic radiation. This transition is known as the Lyman series and corresponds to ultraviolet light.Rate this question:
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- 12.
Isotopes are elements with
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The same atomic number and the same number of neutrons.
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The same mass number but a different number of neutrons
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The same atomic number but a different number of neutrons.
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Different atomic and mass numbers but the same number of neutrons
Correct Answer
A. The same atomic number but a different number of neutrons.Explanation
Isotopes are elements that have the same atomic number, which represents the number of protons in the nucleus, but a different number of neutrons. This means that isotopes have the same number of electrons and protons, giving them the same chemical properties, but they differ in their atomic mass due to the varying number of neutrons. Therefore, the correct answer is that isotopes have the same atomic number but a different number of neutrons.Rate this question:
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- 13.
Which two species contain the same number of neutrons?
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55Mn and 56Fe
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35Cl and 37Cl
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23Na and 39K
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32S and 35Cl
Correct Answer
A. 55Mn and 56FeExplanation
Mn-55 has 25 protons and 30 neutrons. Fe-56 has 26 protons and 30 neutrons. Both elements are transition metals with similar nuclear stability due to their neutron-to-proton ratio. Mn-55 and Fe-56 are important in metallurgy, playing key roles in alloy formation.Rate this question:
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May 10, 2024Quiz Edited by
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Expert Reviewed by
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Sep 15, 2012Quiz Created by
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