Regents Chemistry 2 — Questions and Answers
Question 1: Which subatomic particle determines the identity of an element?
- Number of neutrons
- Number of protons (Correct answer)
- Number of electrons
- Atomic mass
Correct answer: Number of protons
The number of protons (atomic number) uniquely identifies each element.
Question 2: What type of bond forms when one atom transfers electrons to another?
- Covalent bond
- Metallic bond
- Ionic bond (Correct answer)
- Hydrogen bond
Correct answer: Ionic bond
Ionic bonds result from the transfer of electrons from a metal to a nonmetal, creating oppositely charged ions.
Question 3: A solution with a pH of 3 is best described as:
- Strongly basic
- Weakly basic
- Weakly acidic
- Strongly acidic (Correct answer)
Correct answer: Strongly acidic
pH 3 is far below 7 (neutral), indicating a strongly acidic solution with a high concentration of H⁺ ions.
Question 4: During electrolysis of water, which gas is produced at the cathode?
- Oxygen
- Carbon dioxide
- Hydrogen (Correct answer)
- Nitrogen
Correct answer: Hydrogen
At the cathode (negative electrode), reduction occurs, producing hydrogen gas (H₂).
Question 5: Which type of radiation has the greatest penetrating power?
- Alpha (α)
- Beta (β)
- Gamma (γ) (Correct answer)
- Neutron radiation
Correct answer: Gamma (γ)
Gamma rays are high-energy electromagnetic radiation with the greatest penetrating power, requiring thick lead or concrete to block.
Question 6: As temperature increases, what generally happens to the solubility of a solid solute in water?
- Decreases
- Increases (Correct answer)
- Remains constant
- First increases then decreases
Correct answer: Increases
For most solid solutes, increasing temperature increases solubility because the endothermic dissolving process is favored at higher temperatures.
Question 7: Which process describes a liquid changing directly into a gas below its boiling point?
- Condensation
- Sublimation
- Evaporation (Correct answer)
- Deposition
Correct answer: Evaporation
Evaporation is the process by which liquid molecules at the surface escape into the gas phase at temperatures below the boiling point.
Regents Chemistry 2
Which subatomic particle determines the identity of an element?