Chemistry Trivia Quiz On Atoms And Molecules!

Reviewed by Zohra Sattar Waxali
Zohra Sattar Waxali, PhD (Chemistry) |
Chemistry
Review Board Member
Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.
, PhD (Chemistry)
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Chemistry Trivia Quiz On Atoms And Molecules! - Quiz

Explore the building blocks of matter with our Atoms and Molecules Quiz! Designed to challenge and enhance your understanding of fundamental chemistry concepts, this quiz will guide you through the essential principles of atoms, molecules, and chemical bonds.
Do you know how many protons, neutrons, and electrons are in a carbon atom? Can you distinguish between ionic and covalent bonds? This quiz will take you through these concepts and more, ensuring a comprehensive understanding of atomic structures, molecular shapes, and periodic trends.
Whether you're a student preparing for exams, a chemistry enthusiast, or simply curious about the microscopic Read moreworld, this quiz offers a fun and informative way to solidify your grasp on atoms and molecules. Each question is carefully crafted to help you understand the key concepts, from electron configurations to molecular formulas. If you're ready to boost your chemistry skills, take the Atoms and Molecules Quiz now and see how well you score!


Atoms and Molecules Questions and Answers

  • 1. 

    If 92.6g of mercury reacts with 7.4g of oxygen. What will be the mass of mercuric oxide?

    • A.

      100g

    • B.

      92.4g

    • C.

      7.4g

    • D.

      7g

    Correct Answer
    A. 100g
    Explanation
    To determine the mass of mercuric oxide produced, we can apply the Law of Conservation of Mass, which states that the mass of the reactants equals the mass of the products. In this case, the reactants are mercury (Hg) and oxygen (O₂), and the product is mercuric oxide (HgO).
    Given:
    Mass of mercury (Hg): 92.6 g
    Mass of oxygen (O₂): 7.4 g
    To Find:
    Mass of mercuric oxide (HgO)
    Solution:
    According to the Law of Conservation of Mass,
    Mass of HgO=Mass of Hg+Mass of O2​
    Mass of HgO=92.6g+7.4g
    Mass of HgO=100.0g
    Therefore, the mass of mercuric oxide produced will be 100.0 g.

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  • 2. 

    If 8.4g of magnesium carbonate on heating gives 4.4g of carbon dioxide and 4.0g of magnesium oxide. These agreement are in agreement with______________

    • A.

      Law of constant proportion

    • B.

      Law of conservation of mass

    • C.

      Law of multiple proportion

    • D.

      Gay lussac's law

    Correct Answer
    B. Law of conservation of mass
    Explanation
    The given question involves the reaction between magnesium carbonate and heat, which results in the formation of carbon dioxide and magnesium oxide. According to the Law of Conservation of Mass, matter cannot be created or destroyed in a chemical reaction, it can only be rearranged. Therefore, the total mass of the reactants should be equal to the total mass of the products. In this case, the mass of magnesium carbonate (8.4g) is equal to the combined mass of carbon dioxide (4.4g) and magnesium oxide (4.0g), confirming the Law of Conservation of Mass.

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  • 3. 

    Which of the following is one of the drawbacks of Dalton's atomic theory?

    • A.

      Matter is made up of atoms

    • B.

      Atoms are indivisible

    • C.

      Atom is neither created nor destroyed

    • D.

      An element consists of only one type of atoms

    Correct Answer
    B. Atoms are indivisible
    Explanation
    Dalton's atomic theory stated that atoms are indivisible, meaning they cannot be broken down into smaller particles. However, later scientific advancements showed that atoms consist of subatomic particles (protons, neutrons, and electrons), proving that atoms can indeed be divided. Thus, the idea that atoms are indivisible is a drawback of Dalton's atomic theory.

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  • 4. 

    The molecular mass of ozone is

    • A.

      32 u

    • B.

      16 u

    • C.

      54 u

    • D.

      48 u

    Correct Answer
    D. 48 u
    Explanation
    mass of O = 16 u mass of 0zone= 3 x 16 =48 u

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  • 5. 

    What is the symbol of sodium and copper?

    • A.

      N and C respectively

    • B.

      S and C respectively

    • C.

      Na and Cu respectively

    • D.

      Na and Co respectively

    Correct Answer
    C. Na and Cu respectively
    Explanation
    Na =Natrium Cu= cuprum

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  • 6. 

    The number of atoms present in a molecule of a substance is

    • A.

      Molecularity

    • B.

      Atomicity

    • C.

      Valency

    • D.

      Reactivity

    Correct Answer
    B. Atomicity
    Explanation
    The correct answer is atomicity. Atomicity refers to the number of atoms that are present in a molecule of a substance. It indicates how many atoms are chemically bonded together to form a molecule. Molecularity, on the other hand, refers to the number of molecules that participate in a chemical reaction. Valency is a measure of an atom's ability to form chemical bonds, while reactivity refers to how readily a substance undergoes a chemical reaction.

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  • 7. 

    What is the valency of carbon in carbon dioxide?

    • A.

      2

    • B.

      1

    • C.

      4

    • D.

      3

    Correct Answer
    C. 4
    Explanation
    In carbon dioxide (CO₂), carbon forms two double bonds, one with each of the two oxygen atoms. Each double bond involves sharing two pairs of electrons, giving carbon a total of four shared electrons and thus a valency of 4 in carbon dioxide.

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  • 8. 

    The atomic weight of nitrogen is 14. It means that

    • A.

      It is 14 times heavier than a hydrogen atom 

    • B.

      It is 14 times heavier than a carbon-12 atom

    • C.

      It is 14 times heavier than a helium atom 

    • D.

      None of the above

    Correct Answer
    A. It is 14 times heavier than a hydrogen atom 
    Explanation
    A hydrogen atom has a mass of 1 amu, and a nitrogen atom has a mass of 14 amu, so a nitrogen atom is 14 times heavier than a hydrogen atom.

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  • 9. 

    Name the scientist who gave the atomic theory of matter

    • A.

      Albert Einstein

    • B.

      John Dalton

    • C.

      James Chadwick

    • D.

      Neils Bohr

    Correct Answer
    B. John Dalton
    Explanation
    John Dalton is the correct answer because he is the scientist who gave the atomic theory of matter. Dalton's atomic theory, proposed in the early 19th century, stated that all matter is made up of tiny indivisible particles called atoms. He also suggested that atoms of different elements have different properties and combine in specific ratios to form compounds. Dalton's theory laid the foundation for modern atomic theory and revolutionized our understanding of the composition and behavior of matter.

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  • 10. 

    Magnesium and oxygen combine in the ratio of 3:2 by mass to form magnesium oxide. What mass of oxygen gas would be required to react completely with 24 grams of magnesium?

    • A.

      16 g

    • B.

      45 g

    • C.

      12 g

    • D.

      19 g

    Correct Answer
    A. 16 g
    Explanation
    MASS OF Mg = 24 G 3x = 24 x = 24/3 x= 8 HENCE 2 X x = 2 X 8 = 16 G

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  • 11. 

    The smallest atom of all is _________.

    • A.

      C

    • B.

      H

    • C.

      Cu

    • D.

      Na

    Correct Answer
    B. H
    Explanation
    The smallest atom of all is H (hydrogen). Hydrogen is the lightest and simplest element in the periodic table, consisting of only one proton and one electron. It has the smallest atomic radius among all the elements, making it the smallest atom.

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  • 12. 

    The value of Avogadro number is _______________.

    • A.

      9.022 x 10^23

    • B.

      6.022 X 10^23

    • C.

      12.44 X 10^23

    • D.

      3.011 X 10^23

    Correct Answer
    B. 6.022 X 10^23
    Explanation
    The Avogadro number is a fundamental constant in chemistry and physics that represents the number of atoms or molecules in one mole of a substance. It is approximately equal to 6.022 x 10^23, which means that there are 6.022 x 10^23 atoms or molecules in one mole of any substance. This value is widely used in various calculations and conversions in chemistry, such as determining the number of atoms in a sample or calculating the molar mass of a compound.

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  • 13. 

    1 mole = ___________ 

    • A.

      6.022 × 10¹⁰ molecules

    • B.

      1.602 × 10⁻¹⁹ molecules

    • C.

      3.14 × 10⁶ molecules

    • D.

      6.022 × 10²³ molecules

    Correct Answer
    D. 6.022 × 10²³ molecules
    Explanation
    1 mole of any substance contains Avogadro's number of entities, which is 6.022 × 10²³. This number represents the quantity of atoms, molecules, ions, or other particles present in one mole of any substance.

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  • 14. 

    What is the valency of nitrogen in ammonia (NH3 )

    • A.

      3

    • B.

      4

    • C.

      2

    • D.

      1

    Correct Answer
    A. 3
    Explanation
    The valency of nitrogen in ammonia (NH3) is 3. This is because nitrogen has 5 valence electrons, and it needs 3 more electrons to complete its octet. In ammonia, nitrogen forms three covalent bonds with three hydrogen atoms, sharing its 3 valence electrons with them. Therefore, the valency of nitrogen in ammonia is 3.

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  • 15. 

    What is the formula of lithium nitride

    • A.

      LiN

    • B.

      (LI2)3 N

    • C.

      Li2N

    • D.

      Li3N

    Correct Answer
    D. Li3N
    Explanation
    The correct answer is Li3N. Lithium nitride is composed of one lithium ion (Li+) and one nitride ion (N3-). Therefore, the formula for lithium nitride is Li3N, indicating that three lithium ions combine with one nitride ion to form the compound.

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Zohra Sattar Waxali |PhD (Chemistry) |
Chemistry
Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.

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  • Current Version
  • May 15, 2024
    Quiz Edited by
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    Expert Reviewed by
    Zohra Sattar Waxali
  • Feb 12, 2016
    Quiz Created by
    Pudding4me
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