1) Who defined elements and distinguished them from compounds? a) Robert Boyle b) Joseph Priestley c) Marie Curie d) Mikhail Tswett 2) What is the chemical formula for water? a) CO₂ b) H₂O c) NaCl d) O₂ 3) Who developed modern chemical symbols? a) Jöns Jakob Berzelius b) Antoine Lavoisier c) Gilbert N. Lewis d) James Chadwick 4) Which process is used to separate mixtures by boiling? a) Filtration b) Distillation c) Centrifugation d) Chromatography 5) Who discovered the neutron? a) Frederick Soddy b) James Chadwick c) Robert Boyle d) Marie Curie 6) What is the term for different forms of the same element? a) Isotopes b) Compounds c) Mixtures d) Solutions 7) Who invented chromatography? a) Mikhail Tswett b) Joseph Priestley c) Louis Pasteur d) Dmitri Mendeleev 8) What is the main ingredient in table salt? a) NaCl b) H₂O c) CO₂ d) O₂ 9) Who coined the term 'isotopes'? a) Frederick Soddy b) Amedeo Avogadro c) Gilbert N. Lewis d) Jöns Jakob Berzelius 10) What process involves separating substances using a spinning motion? a) Centrifugation b) Filtration c) Evaporation d) Decantation 11) What is the chemical symbol for carbon dioxide? a) CO₂ b) H₂O c) NaCl d) O₂ 12) Who developed Lewis structures? a) Gilbert N. Lewis b) Amedeo Avogadro c) Joseph Proust d) Marie Curie 13) What is the term for the simplest ratio of elements in a compound? a) Empirical formula b) Molecular formula c) Chemical symbol d) Isotope 14) Who proposed the Law of Definite Proportions? a) Joseph Proust b) Dmitri Mendeleev c) Antoine Lavoisier d) Robert Boyle 15) What is the process of separating substances by passing them through a medium? a) Chromatography b) Distillation c) Centrifugation d) Filtration 16) Who developed the periodic table? a) Dmitri Mendeleev b) Amedeo Avogadro c) Jöns Jakob Berzelius d) Frederick Soddy 17) What is the chemical formula for sodium chloride? a) NaCl b) H₂O c) CO₂ d) O₂ 18) Who introduced Avogadro's number? a) Amedeo Avogadro b) Gilbert N. Lewis c) Joseph Priestley d) Marie Curie 19) What is the process of separating a solid from a liquid using a porous barrier? a) Filtration b) Evaporation c) Decantation d) Magnetic separation 20) Who pioneered research in radioactivity? a) Marie Curie b) Louis Pasteur c) Robert Boyle d) Mikhail Tswett 21) What are isotopes? a) Same protons, different neutrons b) Same neutrons, different protons c) Same electrons, different protons d) Same mass, different charge 22) Which element has isotopes? a) All elements b) Only metals c) Only gases d) Only non-metals 23) Isotopes of an element have: a) Same atomic number b) Different atomic number c) Same mass number d) Different chemical properties 24) Carbon-12 and Carbon-14 are: a) Isotopes b) Ions c) Allotropes d) Isomers 25) Isotopes differ in: a) Neutron number b) Proton number c) Electron number d) Chemical properties 26) Which isotope is used in dating fossils? a) Carbon-14 b) Carbon-12 c) Carbon-13 d) Carbon-11 27) Isotopes have identical: a) Chemical properties b) Mass numbers c) Neutron numbers d) Physical properties 28) Which isotope is used in nuclear reactors? a) Uranium-235 b) Uranium-238 c) Thorium-232 d) Plutonium-239 29) Hydrogen has how many isotopes? a) Three b) Two c) Four d) One 30) What is the name of CO2? a) Carbon dioxide b) Carbon monoxide c) Carbon trioxide d) Carbon oxide

CHEM 1_Lessons 1-9 Review

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