The reaction 2 Cu + O2 ? 2 CuO has long been called an oxidation-reaction. Copper also reacts with chlorine: Cu + Cl2 ? CuCl2. In such a reaction:. a. Copper is also oxidized even though no oxygen is present. b. Chlorine is oxidized. c. Oxidation occurs, but reduction does not. d. There is no change in oxidation numbers.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.