Which is most likely to happen during a single-displacement reaction? a. a compound will break apart into two or more products. b. a metal will replace a nonmetal in a compound c. a metal replaces another metal in a compound d. the ions in two compounds will switch places

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.