question Which acid is produced in the stomach to aid digestion

Which thermodynamic function represents the maximum useful work obtainable from a system at constant temperature and pressure?

A. Gibbs Free Energy
B. Helmholtz Free Energy
C. Enthalpy
D. Internal Energy

The electron affinity of an atom is a measure of its tendency to:

A. Gain electrons
B. Lose electrons
C. Form ions
D. Bond with other atoms

The pH scale is a measure of the concentration of:

A. Hydrogen ions (H⁺)
B. Hydroxide ions (OH⁻)
C. Sodium ions (Na⁺)
D. Chloride ions (Cl⁻)

What is the IUPAC name for CH₃CH₂CH₂COOH?

A. Butanoic acid
B. Ethanoic acid
C. Propanoic acid
D. Pentanoic acid

What is the primary purpose of a sample preparation technique in analytical chemistry?

A. Remove interferences and enhance analyte concentration
B. Increase the volume of the sample
C. Decrease the sensitivity of the instrument
D. Speed up reaction rates

The term "electron shielding" refers to the:

A. Repulsion between electrons
B. Attraction between electrons and protons
C. Reduction of effective nuclear charge
D. Increase in effective nuclear charge

What is the term for a bond formed by the attraction between positive metal ions and delocalized electrons?

A. Metallic
B. Ionic
C. Covalent
D. Polar

What is the term for a bond formed by the sharing of electrons between identical atoms?

A. Nonpolar covalent
B. Polar covalent
C. Ionic
D. Metallic

What is the name of the element with atomic number 92?

A. Uranium
B. Neptunium
C. Plutonium
D. Americium

The balanced chemical equation for the reaction between sulfuric acid (H₂SO₄) and potassium carbonate (K₂CO₃) is:

A. H₂SO₄ + K₂CO₃ → K₂SO₄ + H₂O + CO₂
B. H₂SO₄ + K₂CO₃ → K₂SO₄ + CO₂ + H₂O
C. H₂SO₄ + K₂CO₃ → K₂SO₄ + 2H₂O + CO₂
D. 2H₂SO₄ + K₂CO₃ → 2K₂SO₄ + 2H₂O + 2CO₂

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