A catalyst works by (1) increasing the potential energy of the reactants (2) increasing the energy released during a reaction (3) decreasing the potential energy of the products (4) decreasing the activation energy required for a reaction

The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is A. Argon B. Xenon C. Helium D. Krypton The gases used in different types of welding would include A. oxygen and hydrogen B.

One pound of liquid water, frozen water (ice), and vaporized water (steam) are present under the same pressure. Which one would have the largest volume? A) ice B) steam C) liquid water D) they would all be the same

Which process involves an increase in the size of an individual cell or a multi-cellular organism? A. mitosis B. protein synthesis C. meiosis D. regulation

Upon dissolving in, undergoes a disproportionation reaction according to the following unbalanced equation: This disproportionation follows first-order kinetics with a half-life of s.

Express the equilibrium constant for the combustion of ethanol in the balanced chemical equation. C2H5OH (g) + 3O2 (g) ⇌2CO2 (g) + 3H2O (g) Express the equilibrium constant for the combustion of ethanol in the balanced chemical equation.

Suppose the average concentration of copper in water is measured to be 2.5 x 10" M. a. Express this concentration in mg/L. b. Express this concentration in ug/L. c.

If I add water to oil what will happen

Commercial fertilizers, which are made by humans, are used to enrich soil for healthier crops. However, erosion may carry the fertilizer chemicals to the oceans. The presence of these chemicals may cause certain kinds of algae to reproduce rapidly.

A cube of iron has a temperature of 35°C. It is placed on top of a hot surface with a temperature of 175°C. What will happen to the iron? A) Its temperature will decrease. B) Heat will flow from the hot surface into the iron.

Density differences cause the