Chemistry Multiple Choice Questions

160 Questions | Total Attempts: 241

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Chemistry Quizzes & Trivia

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Questions and Answers
  • 1. 
    The particle that has the smallest mass is the
    • A. 

      Electron

    • B. 

      Proton

    • C. 

      Nucleus

    • D. 

      Ion

    • E. 

      Neutron

  • 2. 
    The person given credit for developing the first modern periodic table is
    • A. 

      Dalton

    • B. 

      Democritus

    • C. 

      Thomson

    • D. 

      Mendeleev

    • E. 

      Chadwick

  • 3. 
    • A. 

      Different atomic numbers

    • B. 

      The same mass number, but different atomic numbers

    • C. 

      The same number of protons and neutrons

    • D. 

      The same number of electrons, but a different number of neutrons

    • E. 

      The same atomic number, but a different mass number

  • 4. 
    The element found in the periodic table in Group 4 and Period 6 is
    • A. 

      Halfnium, Hf

    • B. 

      Selenium, Se

    • C. 

      Gadolinium, Gd

    • D. 

      Chromium, Cr

    • E. 

      Aluminum, Al

  • 5. 
    The element found in the periodic table in Group 6 and period 4 is
    • A. 

      Halfnium, Hf

    • B. 

      Selenium, Se

    • C. 

      Lithium, Li,

    • D. 

      Gadolinium, Gd

    • E. 

      Chromium, Cr

  • 6. 
    Which of the following matches of group number and common name is incorrect?
    • A. 

      Group 2 - Alkaline Earth Metals

    • B. 

      Group 6 - Lanthanides

    • C. 

      Group 1 - Alkali Metals

    • D. 

      Group 17 - Halogens

    • E. 

      Group 18 - Noble Gases

  • 7. 
    Which of the following matches of group number and common name is incorrect?
    • A. 

      Group 7 - Transition Metals

    • B. 

      Group 2 - Alkali Earth Metals

    • C. 

      Group 17 - Halogens

    • D. 

      Group 2 - Actinides

    • E. 

      Group 18 - Noble Gases

  • 8. 
    According to the periodic law, chemical properties are repeated at a regular interval when
    • A. 

      Elements are listed in order of their atomic radius

    • B. 

      Elements are listed in order of their date of discovery

    • C. 

      Families of elements are listed in order

    • D. 

      Periods are arranged in order

    • E. 

      Elements are arranged in order of increasing atomic number

  • 9. 
    A metaloid in Period 3 is
    • A. 

      Scandium

    • B. 

      Aluminum

    • C. 

      Germanium

    • D. 

      Phosphorus

    • E. 

      Silicon

  • 10. 
    A nonmetal in Period 6 is
    • A. 

      Astatine

    • B. 

      Iodine

    • C. 

      Polonium

    • D. 

      Radon

    • E. 

      Rubidum

  • 11. 
    The atomic mass of barium is due to the number of
    • A. 

      Neutrons and electrons in the nucleus

    • B. 

      Electrons in the nucleus

    • C. 

      Protons and neutrons in the nucleus

    • D. 

      Protons and electrons in the atom

    • E. 

      Protons in the nucleus

  • 12. 
    The properties of elements repeat periodically if they are arranged by
    • A. 

      Atomic mass

    • B. 

      Atomic charge

    • C. 

      Atomic number

    • D. 

      Number of neutrons

    • E. 

      Number of electrons

  • 13. 
    The atomic number is the number of
    • A. 

      Protons in the nucleus

    • B. 

      Neutrons in the nucleus

    • C. 

      Protons plus the number of neutrons in the nucleus

    • D. 

      Electrons plus the number of protons in the nucleus

    • E. 

      Electrons plus the number of neutrons in the nucleus

  • 14. 
    Why does atomic radius decrease from left to right in a period?
    • A. 

      Nuclear charge increases from left to right in a period

    • B. 

      Nuclear charge decreases from left to right in a period

    • C. 

      The number of energy levels increase from left to right in a period

    • D. 

      The number of energy levels decreases from left to right in a period

    • E. 

      The number of electrons decreases from left to right in a period

  • 15. 
    Why does electron affinity increase from bottom to top in a chemical family?
    • A. 

      Nuclear charge increases from bottom to top in a chemical family

    • B. 

      Nuclear charge decrease from bottom to top in a chemical family

    • C. 

      The number of energy levels increases from bottom to top in a chemical family

    • D. 

      The number of energy levels decreases from bottom to top in a chemical family

    • E. 

      The number of electrons increases from bottom to top in a chemical family

  • 16. 
    Which of the following is the most reactive element?
    • A. 

      Helium

    • B. 

      Radon

    • C. 

      Francium

    • D. 

      Hydrogen

    • E. 

      Ununoctium

  • 17. 
    Why is it easier to remove an electron from potassium than it is to remove an electron from calcium?
    • A. 

      Potassium has a higher electron affinity

    • B. 

      Potassium has a higher ionization energy

    • C. 

      Potassium has a lower nuclear charge

    • D. 

      Calcium has a lower electron affinity

    • E. 

      Calcium is a metal, but potassium is not

  • 18. 
    Which of the following is a practical use of radioisotopes?
    • A. 

      Determining the age of old objects

    • B. 

      Medical diagnosis

    • C. 

      Production of electricity

    • D. 

      All of the above

    • E. 

      None of the above

  • 19. 
    According to the Lewis model of the atom, the number of bonding electrons in a nitrogen atom is
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      5

    • E. 

      7

  • 20. 
    Which of the following atoms is believed to contain three lone pairs of electrons?
    • A. 

      H

    • B. 

      Al

    • C. 

      B

    • D. 

      C

    • E. 

      Cl

  • 21. 
    Multivalent metals
    • A. 

      Can form more than one ion, each with its own charge

    • B. 

      Can exist in several different crystalline forms

    • C. 

      Appear only in the representative metal groups

    • D. 

      Contain more than one populated energy level

    • E. 

      Form an ion whose charge is 2+ or greater

  • 22. 
    The systematic IUPAC name for HBr(aq) is
    • A. 

      Aqueous bromine

    • B. 

      Aqueous hydrogen bromide

    • C. 

      Hypobromic acid

    • D. 

      Hydrobromic acid

    • E. 

      Bromic acid

  • 23. 
    Which of the following formulas does not represent a molecular compound?
    • A. 

      CO2

    • B. 

      CoCl2

    • C. 

      SO2

    • D. 

      PCl5

    • E. 

      HCl

  • 24. 
    The concept of multiple covalent bonds is used to explain the molecular formula of 
    • A. 

      O2

    • B. 

      NaCl

    • C. 

      C2H6

    • D. 

      F2

    • E. 

      NaOH

  • 25. 
    The IUPAC name for CaCl2 is
    • A. 

      Calcium chloride

    • B. 

      Calcium (II) chloride

    • C. 

      Calcium dichloride

    • D. 

      Calcium chlorate

    • E. 

      Monocalcium dichloride