Front

What is the Law of Multiple Proportions?

Back

The Law of Multiple Proportions states that when two elements combine to form more than one compound, the ratios of the masses of one element that combine with a fixed mass of the other element can be expressed as small whole numbers.

Front

Which scientist proposed the solid sphere model of the atom?

Back

John Dalton proposed the solid sphere model of the atom, suggesting that atoms are indivisible and indestructible.

Front

List the sequence of scientists who contributed to the atomic model: Dalton, Thomson, Rutherford, Bohr, Chadwick.

Back

The correct sequence is: John Dalton, J.J. Thomson, Ernest Rutherford, James Chadwick, Niels Bohr.

Front

What produces an emission line spectrum?

Back

An emission line spectrum is produced when electrons transition from higher to lower energy levels, emitting light at specific wavelengths.

Front

What is the speed of light in a vacuum?

Back

The speed of light in a vacuum is approximately 3.00 × 10^8 m/s.

Front

What is Dalton's Atomic Theory?

Back

Dalton's Atomic Theory states that all matter is made of atoms, which are indivisible and indestructible particles, and that compounds are formed by a combination of different types of atoms.

Front

What did J.J. Thomson discover?

Back

J.J. Thomson discovered the electron and proposed the 'plum pudding' model of the atom, where electrons are embedded in a positively charged 'soup'.

Front

What is the significance of Ernest Rutherford's gold foil experiment?

Back

Rutherford's gold foil experiment demonstrated that atoms have a small, dense nucleus that contains most of the atom's mass, leading to the nuclear model of the atom.

Front

What is the Bohr model of the atom?

Back

The Bohr model of the atom describes electrons orbiting the nucleus in fixed paths or energy levels, with specific energy associated with each level.

Front

What is the difference between an emission spectrum and an absorption spectrum?

Back

An emission spectrum shows the wavelengths of light emitted by electrons transitioning from higher to lower energy levels, while an absorption spectrum shows the wavelengths absorbed by electrons moving from lower to higher energy levels.