question Which analytical technique involves passing an electric current through a solution to determine the concentration of an analyte

Chemistry

Which analytical technique involves passing an electric current through a solution to determine the concentration of an analyte?

A. Electrochemical methods
B. Spectroscopy
C. Chromatography
D. Titration

Electrochemical methods involve passing an electric current through a solution to determine analyte concentration.

According to the Second Law of Thermodynamics, the entropy of the universe tends to:

A. Increase
B. Decrease
C. Remain constant
D. Depend on the system

What is the IUPAC name for CH₃CH₂COCH₂CH₃?

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

Which type of RNA carries amino acids to the ribosome during protein synthesis?

A. Transfer RNA (tRNA)
B. Messenger RNA (mRNA)
C. Ribosomal RNA (rRNA)
D. Small nuclear RNA (snRNA)

Which functional group is present in an alcohol?

A. Hydroxyl (-OH)
B. Carbonyl (C=O)
C. Amino (-NH₂)
D. Ester (-COO-)

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

What type of reaction involves the combination of two compounds to form a new compound and a byproduct?

A. Synthesis
B. Decomposition
C. Single displacement
D. Double displacement

The reaction between an alkene and a halogen to form a dihalide is an example of:

A. Halogenation
B. Hydrogenation
C. Dehydration
D. Oxidation

Which analytical technique is commonly used for identifying and quantifying elements in a sample?

A. Atomic absorption spectroscopy
B. Infrared spectroscopy
C. Nuclear magnetic resonance
D. Gas chromatography

The standard entropy of a substance is defined at:

A. 1 atm pressure and 0 K
B. 1 atm pressure and 25°C
C. 0 atm pressure and 0 K
D. 0 atm pressure and 100°C

Which quantum number is related to the orientation of an orbital in space?

A. Magnetic
B. Principal
C. Azimuthal
D. Spin