question The Aufbau principle states that electrons fill orbitals from

Chemistry

The Aufbau principle states that electrons fill orbitals from:

A. Highest energy to lowest energy
B. Lowest energy to highest energy
C. Randomly
D. Alternating energy levels

Electrons fill orbitals in order of increasing energy.

Which technique measures the rate of a chemical reaction by monitoring changes in absorbance or fluorescence over time?

A. Kinetic spectrophotometry
B. Fluorimetry
C. Mass spectrometry
D. Infrared spectroscopy

Which macromolecule is composed of amino acid monomers and plays a crucial role in structure and function in living organisms?

A. Protein
B. Carbohydrate
C. Lipid
D. Nucleic acid

The Carnot efficiency of a heat engine operating between two temperatures (T₁ and T₂) is given by:

A. 1 - T₂/T₁
B. T₂/T₁
C. 1 - T₁/T₂
D. (T₁ - T₂)/T₁

A reaction in which a compound gains electrons is known as:

A. Reduction
B. Oxidation
C. Hydrolysis
D. Esterification

What is the significance of the term "isoelectronic" in atomic structure?

A. Same number of protons
B. Same number of electrons
C. Same atomic mass
D. Same nuclear charge

Which of the following is an example of a diene?

A. Ethene
B. Propene
C. Butene
D. Butadiene

The unit of pressure in the International System of Units (SI) is:

A. Pascal (Pa)
B. Atmosphere (atm)
C. Torr
D. Bar

What is the IUPAC name for CH₃COCH₃?

A. Acetone
B. Propanone
C. Butanone
D. Ethanal

The chemical equation 4NH₃ + 5O₂ → 4NO + 6H₂O represents a:

A. Synthesis
B. Decomposition
C. Redox
D. Combustion

What is the product of the reaction between nitric acid (HNO₃) and potassium hydroxide (KOH)?

A. Potassium nitrate and water
B. Nitrogen gas and oxygen gas
C. Potassium hydroxide and water
D. Potassium nitrite and water