which procedure would best allow a scientist to observe a chemical property of hydrochloric acid (hcl)…

which procedure would best allow a scientist to observe a chemical property of hydrochloric acid (hcl) solution? \n cooling the hcl solution until it becomes solid, and measuring this temperature \n adding zinc to the hcl solution and observing whether or not bubbles are produced \n placing a conductivity probe into a beaker of hcl solution to determine if it conducts electricity \n measuring the mass of and volume of a sample of hcl solution to find its density

which procedure would best allow a scientist to observe a chemical property of hydrochloric acid (hcl) solution? \n cooling the hcl solution until it becomes solid, and measuring this temperature \n adding zinc to the hcl solution and observing whether or not bubbles are produced \n placing a conductivity probe into a beaker of hcl solution to determine if it conducts electricity \n measuring the mass of and volume of a sample of hcl solution to find its density

Answer

Brief Explanations:

To determine the correct option, we analyze each choice:

  • Cooling to solid (freezing point) and measuring temperature: This is a physical property (freezing point) as it involves a phase change without altering the chemical identity.
  • Adding zinc to HCl: Zinc reacts with HCl ($\ce{Zn + 2HCl -> ZnCl_{2} + H_{2}}$), producing hydrogen gas (bubbles). This reaction shows a chemical property (reactivity) as a new substance is formed.
  • Conductivity probe: Conductivity in solution is due to ion presence, but measuring conductivity is a physical property test (related to ion mobility, not a chemical reaction).
  • Measuring mass/volume for density: Density is a physical property (mass per unit volume, no chemical change).

So the procedure involving a chemical reaction (adding zinc) best shows a chemical property.

Answer:

B. adding zinc to the HCl solution and observing whether or not bubbles are produced