Directions: classify the changes listed below as either physical or chemical and explain your reasoning. on the reverse side of this paper, provide two additional examples of physical changes and two additional examples of chemical changes while also explaining your reasoning.

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.