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    Grade 11 Chemistry Worksheet

    Uploaded by

    Abiot Dibaba

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Grade 11 Chemistry Worksheet

    Uploaded by

    Abiot Dibaba
    1 views3 pages

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    GRADE 11 CHEMISTRY WORKSHEET

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    1 views3 pages

    Grade 11 Chemistry Worksheet

    Uploaded by

    Abiot Dibaba

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    የካአባዶ 2ኛደረጃት/ቤት Yeka Abado Secondary School

    MANA BARUMSA EEKKAA ABBAADOO SADARKAA 2FFAA


    CHEMISTRY WORKSHEET FOR GRADE 11THREGULAR STUDENTS IN 2016E.C
    Part I: Choose the correct answer from the given alternatives

    1. The number of neutrons in an atom of 226 88 Ra is:


    A. 88 B. 138 C. 82 D. 314
    2. Which of the following are usually found in the nucleus of an atom?
    A. Protons and neutrons only C. Protons, neutrons and electrons c
    B. Neutrons only D Electrons and neutrons only
    3. An atom has an atomic number of 31 and a mass numbers of 70. How many electrons
    will it have in its valence shell? A. 5 B. 3 C. 4 D. 2
    4. Which of the following would produce a line spectrum rather than a continuous
    spectrum?
    A. Sunlight C. A normal filament light bulb
    B. Excited hydrogen atom D. A yellow (sodium) street light
    5. Among the following, which colour corresponds to light of the highest frequency?
    A. Green B. Yellow C. Red Blue
    6. Which one of the following is not a valid electronic configuration?
    A. 2, 8, 8, 2 B. 2, 6 C. 2, 8, 9, 1 D. 2, 8, 4
    7. Which of the given elements will have the electronic configuration 1s22s22p63s23p64s2?
    A. Neon atoms B. Magnesium ion C. Chlorine atoms D. Calcium atoms
    8. Which of the following elements has the lowest first ionization energy?
    A. Potassium B. Calcium C. Sodium D. Argon
    9. How many 3d electrons are present in the ground state of chromium atom?
    A. 9 B. 6 C. 4 D. 5
    10. The first ionization energy of Aluminium is slightly lower than that of magnesium
    because:
    A. magnesium has a higher nuclear charge
    B. the outer electron in Aluminium is in a p-orbital not an s-orbital
    C. in Aluminium the electron is being lost from a doubly filled orbital
    D. the radius of the Aluminium atom is greater than that of the magnesium atom
    11. Which of the following atoms would have the highest fourth ionization energy?
    A. A. P B. N C. Si D. C
    12. How many unpaired electrons are there in the Cr3+ ion?
    A. 6 B. 1 C. 3 D. 0
    13. Which of the following species would require the highest energy for the removal of one
    electron? A. Mg2+ B. Ne C. Na+ D. F–
    14. Which of the following has the lowest electronegativity?
    A. Carbon B. Beryllium C. Magnesium D. Boron
    15. Which of the following has the smallest radius? A. Na B. Mg C. Na+ D.Mg+2

    Part II: Answer the following questions:


    16. Identify the following subatomic particles:
    A. The number of these in the nucleus is equal to the atomic number.
    B. The particle that is gained or lost when ions are formed.
    C. The particle that is not found in the nucleus.
    D. The particle that has no electrical charge.
    E. The particle that has a much lower mass than the others.
    17. In naturally occurring copper isotopes, 63 29Cu contributes 69.09% and 65 29Cu, 30.91%.
    Calculate the relative atomic mass of copper. (Accurate mass determined; 63 29Cu =
    62.9298 mu, 65 29Cu = 64.9278 mu)
    18. Arrange the following in order of increasing ionization energy: Li, Na, Ne, N, O
    19. Explain the following:
    A. The first ionization energy of beryllium is greater than that of boron.
    B. The first ionization energy of oxygen is less than that of nitrogen.
    C. The first ionization energy of lithium is greater than that of sodium.
    20. Arrange the following in order of increasing atomic radius Mg, Cs, Ca, Al, Ba.
    21. Excited sodium atoms emit light with a wavelength of 589 nm. Calculate the:
    A. frequency of the light
    B. energy of one of these photons in joules
    22. A hydrogen atom is excited to the n = 8 energy level. It emits a photon of light as it falls
    to the n = 2 energy level. Calculate the:
    A. wavelength of light emitted, and
    B. frequency of the light emitted
    23. The electron of a hydrogen atom is in the n = 3 level. What is its energy?
    24. Calculate the wavelength of the light emitted when an electron falls from n = 3 to the n =
    1 state in hydrogen atom.
    25. The photon emitted by a cyclotron has a velocity of 1.50 × 103 m s–1. What is the
    wavelength of this photon? Given that the mass of photon = 1.676 × 10–27 kg and
    Planck’s constant = 6.62 × 10–34 J.s.
    26. Write the number and the letter for the orbital that corresponds to the following pairs of n
    and l quantum numbers: A. n = 3, l = 1 B. n = 3, l = 2 C. n = 4, l = 0 D. n =
    5, l = 3
    27. Write the electron configurations for the following atoms and ions:
    A. Fe3+ B. Cr3+ C. V D. Al+

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