question Which scientist proposed the concept of the quantization of energy levels in an atom

Chemistry

Which scientist proposed the concept of the quantization of energy levels in an atom?

A. Max Planck
B. Niels Bohr
C. Louis de Broglie
D. Werner Heisenberg

Bohr introduced the concept of quantized energy levels.

Which vitamin is essential for the synthesis of collagen, a structural protein in connective tissues?

A. Vitamin C
B. Vitamin D
C. Vitamin A
D. Vitamin E

A solution with a pH of 3 is considered:

A. Acidic
B. Neutral
C. Basic
D. Alkaline

What is the primary goal of analytical chemistry?

A. Determining the composition of substances
B. Studying atomic structure
C. Investigating chemical reactions
D. Analyzing geological formations

What is the IUPAC name for CH₃CH₂COCH₂CH₃?

A. Butanone
B. Pentanone
C. Hexanone
D. Propanone

In gas chromatography, separation is based on differences in:

A. Vapor pressure
B. Boiling point
C. Density
D. Molecular weight

Who developed the concept of quantum numbers?

A. Erwin Schrödinger
B. Werner Heisenberg
C. Max Planck
D. Louis de Broglie

What is the term for the distance between two successive peaks in a wave?

A. Wavelength
B. Frequency
C. Amplitude
D. Crest

What is the equation for calculating work (w) in a gas expansion or compression?

A. w = -PΔV
B. w = PΔV
C. w = ΔH
D. w = ΔS

Which of the following is an example of a strong acid used in laboratories?

A. Hydrochloric acid (HCl)
B. Acetic acid (CH₃COOH)
C. Citric acid
D. Carbonic acid (H₂CO₃)

The equation ΔG = ΔH - TΔS is related to which thermodynamic process?

A. Gibbs free energy
B. Enthalpy
C. Entropy
D. Internal energy