10 - Science - 10. Chemistry – Atoms And Molecules

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| By Padasalai10S
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Padasalai10S
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Quizzes Created: 19 | Total Attempts: 61,347
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  • 1/6 Questions

    Molecular mass of nitrogen is 28. Its atomic mass is 14. Find the atomicity of nitrogen.

    • 28
    • 14
    • 2
    • 3
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About This Quiz

Explore foundational chemistry concepts through this engaging quiz on atoms and molecules. Test your understanding of isotopes, isobars, molecular mass, and more, enhancing your knowledge relevant for academic and professional success in chemistry.

Atoms And Molecules Quizzes & Trivia

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  • 2. 

    From the given examples, form the pair of isotopes.   18 Ar 40, 17 Cl 35, 20 Ca 40, 17 Cl 37

    • 18 Ar 40, 20 Ca 40

    • 17 Cl 35, 17 Cl 37

    Correct Answer
    A. 17 Cl 35, 17 Cl 37
    Explanation
    The pair of isotopes in the given examples is 17 Cl 35 and 17 Cl 37. Isotopes are atoms of the same element that have different numbers of neutrons. In this case, both atoms are chlorine (Cl) atoms, but one has 35 neutrons and the other has 37 neutrons.

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  • 3. 

    From the given examples, form the pair of isobars.   18 Ar 40, 17 Cl 35, 20 Ca 40, 17 Cl 37

    • 17 Cl 35, 17 Cl 37

    • 18 Ar 40, 20 Ca 40

    Correct Answer
    A. 18 Ar 40, 20 Ca 40
    Explanation
    Isobars are atoms or ions that have the same atomic mass but different atomic numbers. In the given examples, the pair 18 Ar 40 and 20 Ca 40 form isobars because they have the same atomic mass of 40 but different atomic numbers of 18 and 20 respectively. Therefore, the correct answer is 18 Ar 40, 20 Ca 40.

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  • 4. 

    Gram molecular mass of oxygen is 32g. Density of oxygen is 1.429g/cc. Find the gram molecular volume of oxygen.

    • 1.429g/cc

    • 32g

    • 1 lit

    • 22.4 lit

    Correct Answer
    A. 22.4 lit
    Explanation
    The gram molecular volume of oxygen is 22.4 liters. This is because the given information states that the gram molecular mass of oxygen is 32g and the density of oxygen is 1.429g/cc. By using the conversion factors provided (1.429g/cc, 32g, 1 lit, and 22.4 lit) and performing the necessary calculations, we arrive at the answer of 22.4 liters.

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  • 5. 

    Calculate the gram molecular mass of water from the values of gram atomic mass of hydrogen and of oxygen.

    • 1

    • 16

    • 18

    • 19

    Correct Answer
    A. 18
    Explanation
    The gram molecular mass of water can be calculated by adding the gram atomic mass of hydrogen (1) to the gram atomic mass of oxygen (16). Therefore, the gram molecular mass of water is 18.

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  • 6. 

    One mole of any substance contains 6.023 x 1023 particles. If 3.0115 x 1023  particles are present in CO2. Find the number of moles.

    • 1

    • 2

    • .05

    • 0.25

    Correct Answer
    A. .05
    Explanation
    The given question states that one mole of any substance contains 6.023 x 10^23 particles. Therefore, to find the number of moles, we divide the given number of particles (3.0115 x 10^23) by the number of particles in one mole. This calculation gives us 0.05 moles.

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Quiz Review Timeline (Updated): Mar 22, 2023 +

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 02, 2013
    Quiz Created by
    Padasalai10S
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