Question

which of the following best matches the description? number used as a measure of hydrogen ion concentration. select one: a. isotope b. nucleus c. combustion d. latent heat e. ion f. proton g. acid h. electron i. enzyme j. photosynthesis k. potential energy l. base m. neutron n. kinetic energy o. entropy p. ph q. respiration

Explanation:

We need to find the term that is a number measuring hydrogen ion concentration. Let's analyze each option:

• Option a: Isotope refers to atoms with the same number of protons but different neutrons, not related to H⁺ concentration.
• Option b: Nucleus is the central part of an atom, irrelevant here.
• Option c: Combustion is a chemical reaction, not a measure of H⁺.
• Option d: Latent heat is about energy in phase changes, not related.
• Option e: Ion is a charged particle, not a measure.
• Option f: Proton is a subatomic particle, not a measure.
• Option g: Acid is a substance that donates H⁺, not the measure of its concentration.
• Option h: Electron is a subatomic particle, not a measure.
• Option i: Enzyme is a biological catalyst, not related.
• Option j: Photosynthesis is a biological process, not related.
• Option k: Potential energy is a form of energy, not related.
• Option l: Base is a substance that accepts H⁺, not the measure.
• Option m: Neutron is a subatomic particle, not a measure.
• Option n: Kinetic energy is a form of energy, not related.
• Option o: Entropy is about disorder, not related.
• Option p: pH is defined as the negative logarithm of hydrogen ion concentration ($\text{pH} = -\log_{10}[\text{H}^+]$), so it measures H⁺ concentration.
• Option q: Respiration is a biological process, not related.

Answer:

p. pH