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Terms starting with R

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Stoichiometry & Chemical Reactions

Roasting

The heating of a sulfide ore strongly in a plentiful supply of air to convert it into the oxide.

2MS + 3O₂ → 2MO + 2SO₂ °C
States of Matter & Gas Laws

Root Mean Square Speed

The square root of the average of the squared molecular speeds in a gas sample.

c_rms = √(3RT / M) m/s
Electrochemistry & Redox

Rusting

The corrosion of iron in the presence of both oxygen and water to form hydrated iron(III) oxide.

4Fe + 3O₂ + 2xH₂O → 2Fe₂O₃·xH₂O Dimensionless
Atomic Structure & Periodicity

Rutherford Model

The nuclear model of the atom, in which a tiny dense positive nucleus is surrounded by orbiting electrons in mostly empty space.

Dimensionless
Atomic Structure & Periodicity

Rydberg Formula

The empirical equation predicting the wavelengths of the spectral lines emitted by a hydrogen-like atom.

1/λ = R_H(1/n₁² − 1/n₂²) m⁻¹