Chemistry Test - Chapter 4 Original

Name:

The _______ describes how any sample of water contains 8 g of oxygen for every 1 g of hydrogen.

• Aufbau principle
• Bohr model of the atom
• Heisenberg uncertainty principle
• law of definite composition

Which was the first model to include the different masses of different elements?

• Hund's model
• Bohr's model
• Rutherford's model
• Dalton's model

Thomson's cathode rays were

• protons
• electrons
• neutrons
• x-rays

Which of the following subatomic particles has the least mass?

• electron
• proton
• neutron
• nucleon

Who is credited with the discovery of the neutron?

• Niels Bohr
• James Chadwick
• Hans Geiger
• Ernest Rutherford

Who first identified and named the proton?

• Niels Bohr
• James Chadwick
• Ernest Rutherford
• J. J. Thomson

Whose work helped to explain line spectra?

• Niels Bohr
• Hans Geiger
• Ernest Rutherford
• Werner Heisenberg

Who conducted the experiment in which alpha particles were deflected by gold foil?

• James Chadwick
• Werner Heisenberg
• Wilhelm Roentgen
• Hans Geiger

Who was the first to refer to matter as being made of discrete particles?

• Democritus
• Bohr
• Thomson
• Dalton