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Chemistry Fundamentals: Laws of Definite Proportions and Multiple Proportions

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Chemistry Fundamentals: Laws of Definite Proportions and Multiple Proportions

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Questions and Answers

What was the outcome of using the calculated charge of the electron?

Confirmation of prevailing atomic models

Discovery of neutrons

A more accurate determination of the elementary charge (correct)

Development of the nuclear model of the atom

What was the result of Rutherford's experiment involving alpha particles and gold foil?

All alpha particles passed through the foil

Some alpha particles bounced back, challenging prevailing atomic models (correct)

The alpha particles were absorbed by the gold foil

The gold foil was destroyed by the alpha particles

What did Chadwick's 1932 experiment involve?

Bombarding atoms with neutrons

Bombarding nuclei with electrons

Bombarding gold foil with alpha particles

Bombarding beryllium with alpha particles (correct)

What is the law of multiple proportions?

The masses of one element that combine with the same mass of the other element are in the ratio of small whole numbers Signup and view all the answers

What was Rutherford's 1920 postulation?

The existence of a 'neutral doublet' in atomic nuclei Signup and view all the answers

What was the significance of the use of cathode-ray tubes in the discovery of electrons?

It helped to determine the charge-to-mass ratio of electrons Signup and view all the answers

What is true about electromagnetic waves?

They can travel through empty space Signup and view all the answers

What is the 'plum pudding model' of the atom?

A model where electrons are randomly dispersed within a positive charge cloud Signup and view all the answers

What was the method used by Millikan to determine the charge of an electron?

By tracking the motion of oil droplets suspended in an electric field Signup and view all the answers

What is the significance of the fact that H2O is always 1:8 Hydrogen to Oxygen by mass?

It demonstrates that the composition of a compound is always the same Signup and view all the answers

What is the significance of the discovery of electrons?

It changed the understanding of the structure of atoms Signup and view all the answers