Gordon adds a piece of solid zinc metal to a beaker of hydrochloric acid. he identifies the products as zinc chloride and hydrogen gas. which process took place in the beaker?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.