Science Times crossword puzzles

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Across
  1. 1. Law: The principle that equal volumes of gases, at the same temperature and pressure, contain the same number of particles (moles).
  2. 3. titration: A laboratory technique used to determine the concentration of an acid or base solution by reacting it with a solution of known concentration.
  3. 7. The time required for half of the radioactive nuclei in a sample to undergo radioactive decay.
  4. 8. dissociation constant (Ka): A measure of the strength of an acid in solution, defined as the ratio of the concentration of the dissociated ions to the concentration of the undissociated acid.
  5. 10. energy: The minimum energy required for a chemical reaction to occur and for reactant molecules to transform into products.
  6. 11. equation: An equation that relates the rate constant of a reaction to the temperature and activation energy.
  7. 13. Law: The principle that the total enthalpy change of a chemical reaction is independent of the pathway taken, as long as the initial and final conditions are the same.
  8. 16. The repeating pattern of chemical and physical properties of elements based on their atomic number.
  9. 19. The ability of an atom to attract shared electrons in a chemical bond.
  10. 20. gas law: The equation that describes the behavior of an ideal gas: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature.
Down
  1. 2. (redox) reaction: A chemical reaction involving the transfer of electrons from one species (reducing agent) to another (oxidizing agent).
  2. 4. product constant (Ksp): The equilibrium constant for the dissolution of a sparingly soluble compound into its constituent ions in a solution.
  3. 5. The process of using an electric current to drive a non-spontaneous chemical reaction, usually the decomposition of a compound into its constituent elements.
  4. 6. decay: The process in which an unstable atomic nucleus undergoes spontaneous radioactive decay, emitting particles or electromagnetic radiation.
  5. 9. free energy: A thermodynamic property that measures the maximum amount of reversible work that can be performed by a system at constant temperature and pressure.
  6. 12. energy: The amount of energy required to remove an electron from an atom or ion in the gas phase.
  7. 14. Law: The principle that at constant temperature, the volume of a gas is inversely proportional to its pressure (P1V1 = P2V2).
  8. 15. equilibrium: The state in a reversible chemical reaction where the forward and reverse reactions occur at equal rates, resulting in no net change in reactant and product concentrations.
  9. 17. radius: The size of an atom, typically measured as the distance between the nucleus and the outermost electron shell.
  10. 18. mass: The mass of one mole of a substance, often expressed in grams per mole (g/mol).