Question

barnard and juan conducted several tests to determine the properties of a piece silver metal. they noted that is was white, and conducted both electricity and heat. they computed the density to be 10.49 g/cm³. when the boys placed the piece of silver in a beaker of water, nothing happened, but when the silver was dropped into nitric acid, a gas was released and the silver disappeared. which sentence describes a chemical reaction taking place? a silver is a conductor of both electricity and heat. b the density was calculated to be 10.49 g/cm³ c when the silver was dropped into nitric acid, a gas was released. d when the boys placed the piece of silver in a beaker of water, nothing happened.

Explanation:

A chemical reaction involves a change in the chemical composition of substances. When silver reacts with nitric acid and a gas is released and silver disappears, new substances are formed. Conductivity and density are physical properties, and no reaction occurs when silver is placed in water.

Answer:

C. When the silver was dropped into nitric acid, a gas was released.