Modern Atomic Theory Quiz

Who were the first to propose the existence of atoms?

• Lucifus and Democrus

• Aristotle and Plato

• Einstein and Bohr

• Newton and Galileo

What did Aristotle and Plato believe matter was composed of?

• Energy and mass

• Protons, neutrons, and electrons

• Earth, water, fire, and air

• Atoms

What does the law of conservation of mass state?

• Matter can be created and destroyed

• Matter is neither created nor destroyed in a chemical reaction

• Energy is converted into mass

• Atoms are indestructible

Who proposed the law of definite proportions?

• John Dalton

• Albert Einstein

• Joseph Proust

• Antoine Lavoisier

What does the law of definite proportions imply about a compound?

• It is composed of different elements each time

• It can change its elemental composition

• It always has the same ratio of its constituent elements

• It can have varying ratios of elements

According to the law of multiple proportions, what is true about the mass ratios of elements in different compounds?

• They are random numbers

• They are small whole numbers

• They are always equal

• They are large fractions

What is an example of compounds that illustrate the law of multiple proportions?

• Oxygen and ozone

• Salt and sugar

• Carbon monoxide and carbon dioxide

• Water and hydrogen peroxide

Which of the following is NOT a postulate of Dalton's atomic theory?

• Chemical reactions are rearrangements of atoms

• Compounds are formed by combining atoms

• Atoms of the same element have different masses

• Atoms are indestructible

What did Dalton's atomic theory suggest about chemical reactions?

• They convert mass into energy

• They destroy atoms

• They rearrange atoms

• They create new elements

Which part of Dalton's atomic theory was later found to be incorrect?

• Compounds are formed by combining atoms

• Chemical reactions are rearrangements of atoms

• Atoms of the same element have the same mass

• Atoms are indestructible