Use your knowledge of atoms, bonding, and the periodic table to complete the chemical equation .”CH4 + O2 and predict the products of the chemical reaction on your paper. Label this equation “Initial Prediction.

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.