#1
Who is considered the father of modern chemistry?
Antoine Lavoisier
ExplanationKnown for establishing the law of conservation of mass.
#2
Which ancient civilization contributed significantly to early chemical knowledge?
Greeks
ExplanationGreek philosophers made significant contributions to early chemical theories.
#3
Who discovered penicillin?
Alexander Fleming
ExplanationObserved antibacterial properties of Penicillium mold.
#4
What is the name of the process used to separate mixtures based on differences in their boiling points?
Distillation
ExplanationBoiling liquid is condensed and collected.
#5
What is the chemical symbol for gold?
Au
ExplanationFrom the Latin 'aurum'.
#6
What is the chemical formula for water?
H2O
ExplanationTwo hydrogen atoms bonded to one oxygen atom.
#7
What is the chemical formula for ammonia?
NH3
ExplanationOne nitrogen atom bonded to three hydrogen atoms.
#8
What is the main component of natural gas?
Methane
ExplanationSimplest alkane, abundant in natural gas deposits.
#9
Who proposed the first modern atomic theory?
John Dalton
ExplanationHis theory introduced the concept of atoms as indivisible particles.
#10
Which scientist is credited with the discovery of radioactivity?
Marie Curie
ExplanationDiscovered radioactivity in uranium.
#11
Which chemical element was the first to be artificially synthesized?
Technetium
ExplanationFirst artificially produced element.
#12
What is the name of the first synthetic dye?
Perkin's mauve
ExplanationSynthesized by William Henry Perkin.
#13
Who is known for the discovery of the noble gases?
William Ramsay
ExplanationDiscovered noble gases such as helium, neon, and argon.
#14
Who is credited with the discovery of the electron?
J.J. Thomson
ExplanationDiscovered electrons using cathode ray tube experiments.
#15
Which scientist proposed the concept of valence electrons?
Gilbert N. Lewis
ExplanationIntroduced the concept of electron pairs involved in chemical bonding.
#16
Who proposed the theory of spontaneous generation?
Aristotle
ExplanationBelieved living organisms could arise from non-living matter.
#17
Who is known for the discovery of the structure of benzene?
Friedrich August Kekulé
ExplanationProposed the cyclic structure of benzene.
#18
Who proposed the theory of chemical bonding known as 'valence bond theory'?
Linus Pauling
ExplanationDescribes how atoms form covalent bonds.
#19
Which scientist is credited with the discovery of the neutron?
James Chadwick
ExplanationDiscovered the neutron, a neutral subatomic particle.
#20
Who proposed the periodic law and created the periodic table of elements?
Dmitri Mendeleev
ExplanationOrganized elements based on atomic mass, leaving gaps for undiscovered elements.
#21
Who proposed the concept of chemical equilibrium?
Le Chatelier
ExplanationHis principle describes how systems reach equilibrium.
#22
What is Avogadro's constant?
6.02 × 10^23
ExplanationNumber of atoms or molecules in one mole of a substance.
#23
Who first isolated pure caffeine?
Friedlieb Ferdinand Runge
ExplanationExtracted caffeine from coffee beans.
#24
Who discovered the electron configuration of atoms?
Linus Pauling
ExplanationDescribed the arrangement of electrons in atoms.