Chemistry Flashcards
7 cards from real Regents practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Chemistry flashcards as text
Which subatomic particle determines the identity of an element?
Answer: Number of protons
The number of protons (atomic number) uniquely identifies each element.
What type of bond forms when one atom transfers electrons to another?
Answer: Ionic bond
Ionic bonds result from the transfer of electrons from a metal to a nonmetal, creating oppositely charged ions.
A solution with a pH of 3 is best described as:
Answer: Strongly acidic
pH 3 is far below 7 (neutral), indicating a strongly acidic solution with a high concentration of H⁺ ions.
During electrolysis of water, which gas is produced at the cathode?
Answer: Hydrogen
At the cathode (negative electrode), reduction occurs, producing hydrogen gas (H₂).
Which type of radiation has the greatest penetrating power?
Answer: Gamma (γ)
Gamma rays are high-energy electromagnetic radiation with the greatest penetrating power, requiring thick lead or concrete to block.
As temperature increases, what generally happens to the solubility of a solid solute in water?
Answer: Increases
For most solid solutes, increasing temperature increases solubility because the endothermic dissolving process is favored at higher temperatures.
Which process describes a liquid changing directly into a gas below its boiling point?
Answer: Evaporation
Evaporation is the process by which liquid molecules at the surface escape into the gas phase at temperatures below the boiling point.