- Which of the following is a pure substance?
(a) Air
(b) Salt water
(c) Iron
(d) Sugar solution
2.The smallest particle of an element that can exist independently is called:
(a) Molecule
(b) Atom
(c) Ion
(d) Electron
- The process of converting a solid directly into a gas is called:
(a) Sublimation
(b) Evaporation
(c) Condensation
(d) Melting - Which of the following is a chemical change?
(a) Melting of ice
(b) Burning of wood
(c) Boiling of water
(d) Dissolving sugar in water - Avogadro’s number represents the number of particles in:
(a) 1 gram of a substance
(b) 1 mole of a substance
(c) 1 liter of a gas
(d) 1 kilogram of a substance - The subatomic particle with a positive charge is:
(a) Electron
(b) Proton
(c) Neutron
(d) Ion - The arrangement of electrons in an atom is described by:
(a) Atomic number
(b) Mass number
(c) Electron configuration
(d) Isotopes - Isotopes of an element have the same number of:
(a) Protons
(b) Neutrons
(c) Electrons
(d) All of the above - The energy required to remove an electron from an atom is called:
(a) Ionization energy
(b) Electron affinity
(c) Electronegativity
(d) Bond energy - The periodic table is arranged based on:
(a) Atomic mass
(b) Atomic number
(c) Number of neutrons
(d) Number of electrons - A chemical bond formed by the sharing of electron pairs is called:
(a) Ionic bond
(b) Covalent bond
(c) Metallic bond
(d) Hydrogen bond - The shape of a water molecule is:
(a) Linear
(b) Bent
(c) Trigonal planar
(d) Tetrahedral - Polar covalent bonds occur when there is a significant difference in:
(a) Atomic size
(b) Electronegativity
(c) Ionization energy
(d) Electron affinity - Ionic compounds are typically formed between:
(a) Metals and nonmetals
(b) Metals and metals
(c) Nonmetals and nonmetals
(d) Noble gases and metals - A chemical reaction in which heat is released is called:
(a) Exothermic
(b) Endothermic
(c) Catalyzed
(d) Reversible - The rate of a chemical reaction is influenced by:
(a) Temperature
(b) Concentration
(c) Catalyst
(d) All of the above - A substance that increases the rate of a chemical reaction without being consumed itself is called:
(a) Reactant
(b) Product
(c) Catalyst
(d) Inhibitor - The process of breaking down a compound into its elements is called:
(a) Synthesis
(b) Decomposition
(c) Combustion
(d) Neutralization - A solution in which water is the solvent is called:
(a) Aqueous solution
(b) Colloidal solution
(c) Suspension
(d) Emulsion - A substance that donates a proton (H+) is called:
(a) Acid
(b) Base
(c) Salt
(d) Buffer - A neutral solution has a pH of:
(a) 0
(b) 7
(c) 14
(d) Any value - The process of adding water to an acid to dilute it is called:
(a) Titration
(b) Neutralization
(c) Dilution
(d) Dissociation - The period of an element in the periodic table indicates the:
(a) Number of shells
(b) Number of valence electrons
(c) Atomic number
(d) Mass number - The valency of sodium is:
(a) 1
(b) 2
(c) 3
(d) 4 - Which of the following compounds has an ionic bond?
(a) Methane (CH4)
(b) Water (H2O)
(c) Sodium chloride (NaCl)
(d) Carbon dioxide (CO2)
Chemistry Concepts Quiz Questions with Answers
- Which of the following is a pure substance?
(c) Iron
2. The smallest particle of an element that can exist independently is called:
(b) Atom
- The process of converting a solid directly into a gas is called:
(a) Sublimation - Which of the following is a chemical change?
(b) Burning of wood - Avogadro’s number represents the number of particles in:
(b) 1 mole of a substance - The subatomic particle with a positive charge is:
(b) Proton - The arrangement of electrons in an atom is described by:
(c) Electron configuration - Isotopes of an element have the same number of:
(a) Protons - The energy required to remove an electron from an atom is called:
(a) Ionization energy - The periodic table is arranged based on:
(b) Atomic number - A chemical bond formed by the sharing of electron pairs is called:
(b) Covalent bond - The shape of a water molecule is:
(b) Bent - Polar covalent bonds occur when there is a significant difference in:
(b) Electronegativity - Ionic compounds are typically formed between:
(a) Metals and nonmetals - A chemical reaction in which heat is released is called:
(a) Exothermic - The rate of a chemical reaction is influenced by:
(d) All of the above - A substance that increases the rate of a chemical reaction without being consumed itself is called:
(c) Catalyst - The process of breaking down a compound into its elements is called:
(b) Decomposition - A solution in which water is the solvent is called:
(a) Aqueous solution - A substance that donates a proton (H+) is called:
(a) Acid - A neutral solution has a pH of:
(b) 7 - The process of adding water to an acid to dilute it is called:
(c) Dilution - The period of an element in the periodic table indicates the:
(a) Number of shells - The valency of sodium is:
(a) 1 - Which of the following compounds has an ionic bond?
(c) Sodium chloride (NaCl)
