Last updated on September 7th, 2023 at 10:56 pm
Q: Who is often referred to as the “father of modern chemistry” and contributed significantly to the understanding of chemical reactions and mass conservation?
a) John Dalton
b) Antoine Lavoisier
c) J. L. Proust
d) Avogadro
Answer: b) Antoine Lavoisier
Q: What is the fundamental principle that states the mass of the original matter and the mass of the matter newly formed as a result of a chemical change are equal?
a) Law of Atomic Mass
b) Law of Constant Proportions
c) Law of Chemical Equilibrium
d) Law of Conservation of Matter
Answer: d) Law of Conservation of Matter
Q: Which scientist assigned systematic names to compounds and authored the first book on modern chemistry?
a) John Dalton
b) J. L. Proust
c) Antoine Lavoisier
d) Avogadro
Answer: c) Antoine Lavoisier
Q: What is the unit of atomic mass based on the unified mass concept?
a) Dalton (u)
b) Gram (g)
c) Kilogram (kg)
d) Newton (N)
Answer: a) Dalton (u)
Q: What is Avogadro’s number?
a) 6.022 x 10^23
b) 1.66053904 x 10^-27
c) 12 x 1/12
d) 14
Answer: a) 6.022 x 10^23
Q: The capacity of an element to combine is called its _____.
a) Atomic number
b) Atomic mass
c) Valency
d) Ionization energy
Answer: c) Valency
Q: In the compound sodium chloride (NaCl), which ion is the basic radical?
a) Na+
b) Cl-
c) Na-
d) Cl+
Answer: a) Na+
Q: Which type of bond forms when atoms of different elements combine with each other?
a) Covalent bond
b) Metallic bond
c) Ionic bond
d) Hydrogen bond
Answer: c) Ionic bond
