Quiz on Atomic Theory

Who introduced the idea that matter is made up of tiny, indivisible particles called atoms?

• Aristotle

• Chadwick

• Democritus

• Lavoisier

Which of the following statements correctly depicts the law of definite proportions?

• The mass ratio of H and O in water (H₂O) differs depending on its source.

• The mass ratio of C and O in CO₂ from burning fossil fuel and CO₂ from human and animal respiration is different.

• The mass of oxygen in water is always 8 times that of hydrogen present regardless of where it came from.

• The mass of carbon in carbon dioxide is always 3 times that of oxygen present regardless of where it came from.

Which of the following pairs of compounds can be used to illustrate the law of multiple proportions?

• ZnS₂ and ZNCl₂

• NH₄ and NH₄Br

• HBr and H₂O₂

• CO and CO₂

Who is the scientist who discovered the proton

• Rutherford

• Lavoisier

• Dalton

• J.J. Thomson

Whose work showed for the first time that atoms emit negatively charged particles?

• John Dalton

• Ernest Rutherford

• J.J. Thomson

• Robert Millikan

Which experimental evidence did Thomson use to prove that particles made up cathode rays rather than light?

• Cathode rays refract through a prism.

• Cathode rays are emitted in a vacuum tube.

• Cathode rays produce interference patterns.

• Cathode rays are deflected in the presence of electric and magnetic fields.

What model shows an atom as a ball of positive charge with electrons embedded in it, much like chocolate chips spread through cookie dough?

• Chocolate Chip model

• Plum and nuts model

• Plum Pudding model

• Chocolate Pudding model

Which of the following statements did NOT correctly describe the results of the experiments done to determine the nature of the atom?

• The cathode ray tube proved that electrons are negatively charged particles.

• Rutherford’s thin gold foil experiment led to the discovery of the charge of the nucleus.

• The results of Rutherford’s experiment supported J.J. Thomson’s plum pudding model.

• The Result of the Cathode ray tube experiment showed that the beam was affected by electromagnetic field

If Rutherford’s experiment proved the correctness of J.J. Thomson’s model, what would he observe?

• alpha particles are greatly deflected by the foil.

• alpha particles bounced back from the foil.

• Alpha particles had little to no deflection.

• more alpha particles are formed.

Who is the scientist whose experiment led to the idea that the center of the atom is a dense positive charge?

• John Dalton

• Ernest Rutherford

• J.J. Thomson

• Robert Millikan