Chemistry Trivia: Atoms And Molecules Quiz

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Zohra Sattar, PhD, Chemistry |
Chemistry Expert
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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: Atoms And Molecules Quiz - Quiz

Get ready to explore the fundamental concepts of atoms and molecules with our comprehensive quiz! This interactive challenge is designed to enhance your understanding of the building blocks of chemistry, from the structure of atoms to the complexities of molecular bonding.
Perfect for students preparing for exams, chemistry enthusiasts, or anyone curious about the microscopic world of atoms and molecules, this quiz covers a range of topics that will test your knowledge and sharpen your skills.
Each question is carefully crafted to reinforce your understanding of these core concepts. Whether you're exploring the periodic table or deciphering molecular Read moreformulas, this quiz is your gateway to mastering chemistry basics. Dive in and see how well you can score!


Atoms and Molecules Questions and Answers

  • 1. 

    Which of the following correctly represents 360g of water?a) 2 moles of waterb) 20 moles of waterc) 6.022 x 1023 molecules of waterd) 1.2044 x 1025 molecules of water 

    • A.

      A)

    • B.

      A) and d)

    • C.

      B) and c)

    • D.

      B) and d)

    Correct Answer
    D. B) and d)
    Explanation
    The correct answer is b) and d) because 360g of water can be represented as both 20 moles of water and 1.2044 x 10^25 molecules of water. The molar mass of water is approximately 18g/mol, so 360g of water is equal to 20 moles. Additionally, using Avogadro's number (6.022 x 10^23 molecules/mol), we can calculate that 20 moles of water is equivalent to 1.2044 x 10^25 molecules of water. Therefore, both options b) and d) correctly represent 360g of water.

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  • 2. 

    Which one of the following statements is not true about an atom​

    • A.

      Atoms are not able to exist independently

    • B.

      Atoms are the basic units from which molecules and ions are formed

    • C.

      Atoms are always neutral

    • D.

      Atoms aggregate in large numbers to form the matters that we can see, feel or touch

    Correct Answer
    A. Atoms are not able to exist independently
    Explanation
    The statement "Atoms are not able to exist independently" is incorrect because atoms can exist independently, particularly noble gas atoms and monatomic gases like helium. Other atoms typically form molecules or ions, but this doesn't mean they inherently can't exist independently.

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  • 3. 

    Which of the following types of chemical bonds involves the sharing of electron pairs between atoms?

    • A.

      Ionic bond

    • B.

      Hydrogen bond

    • C.

      Covalent bond

    • D.

      Metallic bond

    Correct Answer
    C. Covalent bond
    Explanation
    A covalent bond is a type of chemical bond that involves the sharing of electron pairs between atoms. These pairs of electrons are known as shared pairs or bonding pairs, and they create a stable balance of attractive and repulsive forces between atoms. Ionic bonds, on the other hand, involve the transfer of electrons between atoms, resulting in charged ions. Hydrogen bonds are weak attractions between a hydrogen atom in one molecule and an electronegative atom in another. Metallic bonds involve the sharing of free electrons among a lattice of metal atoms.

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  • 4. 

    Which molecular shape best describes a molecule with four bonded pairs and no lone pairs on the central atom?

    • A.

      Linear

    • B.

      Trigonal planar

    • C.

      Bent

    • D.

      Tetrahedral

    Correct Answer
    D. Tetrahedral
    Explanation
    A molecule with four bonded pairs and no lone pairs on the central atom forms a tetrahedral shape. This is because the four pairs of electrons around the central atom repel each other equally, resulting in a tetrahedral geometry with bond angles of 109.5°. Linear molecules have two bonded pairs with no lone pairs. Trigonal planar shapes occur with three bonded pairs and no lone pairs. Bent shapes involve lone pairs, causing the bonded atoms to deviate from a straight line.

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  • 5. 

    All samples of carbon dioxide contain carbon and oxygen in the mass ratio of 3:8. This is in agreement with the Law of ___________.

    • A.

      Conservation of Mass

    • B.

      Constant Proportion

    • C.

      Multiple Proportion

    • D.

      Reciprocal Proportion

    Correct Answer
    B. Constant Proportion
    Explanation
    The given statement suggests that all samples of carbon dioxide have a consistent mass ratio of carbon to oxygen, which is 3:8. This is in agreement with the Law of Constant Proportion, which states that a given compound always contains the same elements in the same proportions by mass. This law is a fundamental principle in chemistry and helps to explain the consistent composition of compounds.

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  • 6. 

    In the periodic table, which group contains elements that are highly reactive and tend to form salts with metals?

    • A.

      Group I (Alkali metals)

    • B.

      Group II (Alkaline earth metals)

    • C.

      Group VIIA (Halogens)

    • D.

      Group VIII (Noble gases)

    Correct Answer
    C. Group VIIA (Halogens)
    Explanation
    Group VIIA, known as the halogens, includes fluorine, chlorine, bromine, iodine, and astatine. These elements are highly reactive and often combine with metals to form salts. For example, sodium chloride (table salt) is a combination of sodium (a metal) and chlorine (a halogen). Alkali metals (Group I) and alkaline earth metals (Group II) are also reactive but do not form salts with other metals. Noble gases (Group VIII) are largely unreactive due to their stable electron configurations.

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  • 7. 

    Avogadro's number represents the number of atoms in ________.​

    • A.

      12 grams of 12C

    • B.

      320 grams of sulphur

    • C.

      32 grams of oxygen

    • D.

      1 gram of 12C

    Correct Answer
    A. 12 grams of 12C
    Explanation
    Avogadro's number represents the number of atoms in 12 grams of 12C. This is because the atomic mass of carbon is 12 atomic mass units (AMU), and Avogadro's number is defined as the number of atoms in 12 grams of carbon-12. Therefore, the answer is 12 grams of 12C.

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  • 8. 

    A sample contains 22 g of carbon dioxide. This is equal to​

    • A.

      One molar volume of carbon dioxide

    • B.

      One mole of carbon dioxide

    • C.

      Half mole of carbon dioxide

    • D.

      Two moles of carbon dioxide

    Correct Answer
    C. Half mole of carbon dioxide
    Explanation
    The molar mass of carbon dioxide (CO2) is approximately 44 g/mol. Therefore, 22 g of carbon dioxide is equal to half a mole (0.5 mol) of carbon dioxide.

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  • 9. 

    Select the ionic compound from the following

    • A.

      Sulphur molecule,

    • B.

      Phosphorous molecule,

    • C.

      Methane,

    • D.

      Copper nitrate,

    Correct Answer
    D. Copper nitrate,
    Explanation
    Copper nitrate is the correct answer because it is an ionic compound. Ionic compounds are formed when a metal and non-metal combine through an electrostatic attraction between positively and negatively charged ions. In the case of copper nitrate, copper is a metal and nitrate is a polyatomic ion consisting of nitrogen and oxygen. Therefore, copper nitrate is an ionic compound.

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  • 10. 

    Chose the option which does not change when a chemical reaction takes place

    • A.

      Volume

    • B.

      Mass

    • C.

      Physical properties

    • D.

      Chemical properties

    Correct Answer
    B. Mass
    Explanation
    Mass is a measure of the amount of matter in an object and is a fundamental property that remains constant during a chemical reaction. In a chemical reaction, the atoms of the reactants rearrange to form new products, but the total mass of the reactants is always equal to the total mass of the products. This is known as the law of conservation of mass. Therefore, mass does not change when a chemical reaction takes place.

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  • 11. 

    Select the option which does not represent molar mass of a substance?

    • A.

      1 mole of HCl

    • B.

      6.022 x molecules of helium

    • C.

      16 gm of

    • D.

      44 gm of

    Correct Answer
    C. 16 gm of
    Explanation
    Option B, "6.022 × 10²³ molecules of helium," does not directly represent the molar mass of a substance. While this number (Avogadro's number) signifies the number of particles in one mole, it does not specify the molar mass itself. In contrast, options A, C, and D all directly represent the molar mass of their respective substances: HCl (36.5 g/mol), CH₄ (16 g/mol), and CO₂ (44 g/mol). Therefore, Option B does not represent the molar mass of a substance.

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  • 12. 

    Which term describes a molecule consisting of two or more atoms held together by chemical bonds?

    • A.

      Element

    • B.

      Isotope

    • C.

      Ion

    • D.

      Molecule

    Correct Answer
    D. Molecule
    Explanation
    A molecule is a group of two or more atoms held together by chemical bonds. These atoms can be the same (as in O₂ or H₂) or different (as in H₂O or CO₂). An element refers to a pure substance composed of only one type of atom. Isotopes are variants of a particular chemical element that differ in neutron number. An ion is an atom or molecule that has gained or lost one or more electrons, thus acquiring an electrical charge.

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  • 13. 

    Which of the following substances has the highest molar mass?

    • A.

      NH₃

    • B.

      H₂O

    • C.

      CO₂

    • D.

      CH₄

    Correct Answer
    C. CO₂
    Explanation
    Among the given substances, NH₃ (ammonia) has a molar mass of about 17 g/mol, H₂O (water) is approximately 18 g/mol, CO₂ (carbon dioxide) is around 44 g/mol, and CH₄ (methane) is roughly 16 g/mol. CO₂ has the highest molar mass among these substances at 44 g/mol.

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  • 14. 

    The chemical symbol for nitrogen gas is​

    • A.

      Ni

    • B.
    • C.

      N+

    • D.

      N

    Correct Answer
    B.
    Explanation
    The correct answer is N. Nitrogen gas is represented by the chemical symbol N. The symbol Ni represents the element nickel, while N+ is not a valid chemical symbol.

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  • 15. 

    Which one of the following would weigh the highest?

    • A.

      0.2 mole of sucrose( )

    • B.

      2 moles of

    • C.

      2 moles of

    • D.

      10 moles of

    Correct Answer
    C. 2 moles of
    Explanation
    Multiplying the molar mass by the number of moles of each compound will calculate the mass of each sample. 2 moles of calcium carbonate weigh the most. Calcium carbonate’s molar mass is 100 g/mol, so 2 moles of calcium carbonate weigh 200 g.

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Zohra Sattar |PhD, Chemistry |
Chemistry Expert
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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  • May 15, 2024
    Quiz Edited by
    ProProfs Editorial Team

    Expert Reviewed by
    Zohra Sattar
  • Nov 27, 2014
    Quiz Created by
    Tanmay Shankar
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