Astudent is told that both energy and mass must be conserved in every chemical reaction. she measures the mass of hydrochloric acid and a zinc strip separately. she then places the zinc strip into the acid and bubbles form as the zinc looks like it disappears. the combined mass afterward is less than the original.

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.