Chemistry – Multiple Choice Questions (MCQs)

1. 61. What is the molecular formula?

   • A. The simplest ratio of atoms in a compound
   • B. The actual number of atoms of each element in a molecule
   • C. The structural formula
   • D. The molar mass

2. 62. What is stoichiometry?

   • A. The study of the quantitative relationships between reactants and products in chemical reactions
   • B. The study of reaction rates
   • C. The study of chemical bonding
   • D. The study of the states of matter

3. 63. What is the mole concept?

   • A. A way to count atoms and molecules using Avogadro's number
   • B. A unit of mass
   • C. A measure of volume
   • D. A way to determine the rate of a reaction

4. 64. What is Avogadro's number?

   • A. 6.022 x 10^23 per mole
   • B. 22.4 liters per mole (at STP)
   • C. 1 gram per mole
   • D. The number of electrons in one atom of carbon

5. 65. What is molar mass?

   • A. The mass of one atom of an element
   • B. The mass of one mole of a substance
   • C. The volume occupied by one mole of a gas at STP
   • D. The number of atoms in one gram of a substance

6. 66. What is electrolysis?

   • A. The process of using electricity to decompose a compound
   • B. The process of dissolving a substance in water
   • C. The process of heating a substance to its melting point
   • D. The process of cooling a substance to its freezing point