Mixtures — Unit test

Question 15 • AA-F26 Physical Science

Which procedure would best allow a scientist to observe a chemical property of hydrochloric acid (HCl) solution?

Answer

cooling the HCl solution until it becomes solid, and measuring this temperature

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

placing a conductivity probe into a beaker of HCl solution to determine if it conducts electricity

measuring the mass of and volume of a sample of HCl solution to find its density

Explanation

A chemical property describes how a substance behaves when it reacts with another substance. Adding zinc tests whether hydrochloric acid reacts to produce hydrogen gas bubbles, so this observes a chemical property. Cooling to find a freezing point, measuring conductivity, and finding density are physical measurements that do not require a chemical reaction.

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