Chemistry – Multiple Choice Questions (MCQs)

1. 49. What is a ketone functional group?

   • A. -CO-
   • B. -O-
   • C. -COO-
   • D. -CONH2-

2. 50. What is a polymer?

   • A. A small molecule
   • B. A large molecule made up of repeating subunits (monomers)
   • C. A type of metal
   • D. A radioactive isotope

3. 51. What is polymerization?

   • A. The process of breaking down large molecules
   • B. The process of forming large molecules from small repeating units
   • C. The evaporation of a solvent
   • D. The condensation of a gas

4. 52. What are plastics?

   • A. Synthetic polymers that can be molded or shaped
   • B. Natural polymers like cellulose
   • C. Metals that can be easily deformed
   • D. Ceramic materials

5. 53. What are fibers?

   • A. Polymers that are long and thin and can be spun into threads
   • B. Brittle materials
   • C. Liquids that do not mix with water
   • D. Gases that are highly reactive

6. 54. What are elastomers?

   • A. Polymers that are rigid and strong
   • B. Polymers that exhibit elasticity (can stretch and return to their original shape)
   • C. Polymers that dissolve easily in water
   • D. Polymers that are good conductors of electricity

7. 55. What is biochemistry?

   • A. The study of chemical processes within and relating to living organisms
   • B. The study of rocks and minerals
   • C. The study of the atmosphere
   • D. The study of the Earth's oceans

8. 56. What are proteins?

   • A. Polymers made of amino acids
   • B. Simple sugars
   • C. Long-chain fatty acids
   • D. Genetic material

9. 57. What are nucleic acids?

   • A. The building blocks of proteins
   • B. Energy storage molecules
   • C. Genetic material (DNA and RNA)
   • D. Structural components of cell walls

10. 58. What is a chemical formula?

    • A. A representation of a molecule using chemical symbols and subscripts to indicate the number of each type of atom
    • B. The name of a chemical compound
    • C. The physical properties of a substance
    • D. The balanced chemical equation for a reaction

11. 59. What is a structural formula?

    • A. A formula that shows the arrangement of atoms and bonds within a molecule
    • B. A formula that only shows the types and numbers of atoms
    • C. The molar mass of a compound
    • D. The empirical formula

12. 60. What is the empirical formula?

    • A. The actual number of atoms of each element in a molecule
    • B. The simplest whole-number ratio of atoms of each element in a compound
    • C. The structural arrangement of atoms
    • D. The mass percentage of each element