Chemistry Pop Quiz - Extra Credit
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Which subatomic particle carries a negative charge?
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Electrons
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Neutrons
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Protons
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All of the above
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Enhance your understanding of Chemistry with this extra credit pop quiz. Topics covered include atomic structure, electromagnetic spectrum relationships, and element properties. Perfect for students looking to deepen their chemistry knowledge and assess key concepts.
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- 2.
Which of the following groups have eight (8) valence electrons in their outermost shell?
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Chalogens
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Alkaline earth metals
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Halogens
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Noble gases
Correct Answer
A. Noble gasesExplanation
Noble gases have eight valence electrons in their outermost shell. Valence electrons are the electrons in the outermost shell of an atom and determine the chemical properties of an element. Noble gases, such as helium, neon, and argon, have a full outer shell with eight electrons, which makes them stable and unreactive. This stability is due to the fact that they have achieved the electron configuration of the nearest noble gas, which is highly favorable. Therefore, noble gases have eight valence electrons in their outermost shell.Rate this question:
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- 3.
Which of the following represents an alkaline earth metal?
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Li
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Ca
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Rb
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Se
Correct Answer
A. CaExplanation
Ca represents an alkaline earth metal. Alkaline earth metals are found in Group 2 of the periodic table and include elements such as beryllium, magnesium, calcium, strontium, barium, and radium. Ca is the chemical symbol for calcium, which is an alkaline earth metal.Rate this question:
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- 4.
In the electromagnetic spectrum, what is the relationship between frequency and energy?
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Inversely proportional
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Directly proportional
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Equivalent
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None of the above
Correct Answer
A. Directly proportionalExplanation
The correct answer is "directly proportional." In the electromagnetic spectrum, frequency and energy are directly proportional. This means that as the frequency of an electromagnetic wave increases, so does its energy. Similarly, as the frequency decreases, the energy of the wave also decreases. This relationship is described by the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency.Rate this question:
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- 5.
If 75.53% Cl-35 with an atomic mass of 34.969 amu and 24.47% Cl with an atomic mass of 3.966 amu. Calculate the average atomic mass for Cl (round the value to the nearest hundreths place).
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35.99 amu
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35.46 amu
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34.60 amu
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34.79 amu
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Option 5
Correct Answer
A. 35.46 amuExplanation
The average atomic mass for Cl can be calculated by multiplying the percent abundance of each isotope by its atomic mass, and then summing up these values. For the first isotope, 75.53% of Cl-35 with an atomic mass of 34.969 amu gives a contribution of (0.7553 * 34.969) amu. For the second isotope, 24.47% of Cl with an atomic mass of 3.966 amu gives a contribution of (0.2447 * 3.966) amu. Adding these contributions together gives the average atomic mass for Cl as 35.46 amu.Rate this question:
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- 6.
In the electromagnetic sprectrum, what is the relationship between gamma and ultraviolet waves?
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Ultraviolet waves have a higher frquency than gamma waves
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Gamma waves have a longer wavelength than ultraviolet waves
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Ultraviolet waves have a greater wavelength than gamma waves
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Ultraviolet waves have a greater energy than gamma waves
Correct Answer
A. Ultraviolet waves have a greater wavelength than gamma waves -
- 7.
Determine the wavelength in meters (m) for an element with a frequency of 5.0 x 10 (8) Hz
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6
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60
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0.6
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.06
Correct Answer
A. 0.6Explanation
The wavelength of an electromagnetic wave is inversely proportional to its frequency. As the frequency increases, the wavelength decreases. In this question, the given frequency is 5.0 x 10^8 Hz. Since the frequency is relatively high, we can expect the wavelength to be relatively low. The wavelength can be calculated using the formula: wavelength = speed of light / frequency. However, since the speed of light is not given, we can use the fact that the speed of light is approximately 3 x 10^8 m/s. Plugging in the values, we get wavelength = (3 x 10^8 m/s) / (5.0 x 10^8 Hz) = 0.6 m. Therefore, the correct answer is 0.6.Rate this question:
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- 8.
Which of the following represents the total number of neutrons in Rb-87?
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87
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37
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50
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Can not be determined
Correct Answer
A. 50Explanation
The correct answer is 50. The number 87 represents the atomic mass of Rb-87, which is the sum of the number of protons and neutrons in the nucleus. Since the atomic number of Rb (Rubidium) is 37, it means that there are 37 protons in the nucleus. To find the number of neutrons, subtract the atomic number from the atomic mass: 87 - 37 = 50. Therefore, the total number of neutrons in Rb-87 is 50.Rate this question:
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- 9.
Which model shows the bonding relationship between elements?
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Lewis
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Bohr
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Mendeelev
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Rutherford
Correct Answer
A. LewisExplanation
The Lewis model shows the bonding relationship between elements. It is based on the concept of valence electrons and uses Lewis structures to represent the arrangement of electrons in a molecule or ion. This model helps in understanding how elements form chemical bonds by sharing or transferring electrons to achieve a stable electron configuration.Rate this question:
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- 10.
Which of the following is consistent with isotopes
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The same number of electrons
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The same chemical properties
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The same atomic mass number
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Different number of neutrons
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Different atomic number
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The same nuclear properties
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The same number of protons
Correct Answer(s)
A. The same number of electrons
A. The same chemical properties
A. Different number of neutrons
A. The same number of protonsExplanation
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. Therefore, they have the same number of electrons and the same chemical properties because the number of electrons determines an atom's chemical behavior. Additionally, since they have the same number of protons, they have the same atomic number. However, they have different atomic mass numbers due to the varying number of neutrons. The statement about the same nuclear properties is not necessarily true as isotopes can have different nuclear properties depending on the number of neutrons.Rate this question:
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Current Version
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Feb 23, 2023Quiz Edited by
ProProfs Editorial Team -
Sep 25, 2020Quiz Created by
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