How does a catalyst speed up a chemical reaction? a. by lowering the activation energy b. by lowering the δh of the reaction c. by raising the energy of the products d. by raising the energy of the reactants

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.