Which of the following is not a clue that a chemical reaction has taken place? * 4 points
A solid is formed when two clear solutions are mixed.
A clear solution is added to a red solution, and the result is a blue solution.
A solid is added to water and bubbles form.
A pure solid is heated and turns into a pure liquid.

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.

Calculate the number of molecules present in 0.750 mol of mgo.

Chemical energy is a form of a. kinetic energy only. b. both potential and kinetic energy. c. neither potential nor kinetic energy. d. potential energy only. reset