Water that freezes demonstrates which scientific process? A. chemical reaction B. increase in amount of matter C. phase change D. formation of new substance.

The number of outer shell electrons determines the chemical properties of an element? a. True b. False

What is the oxidation number of N in N2H4?

Select the correct answer. Why does every chemical reaction require a certain amount of activation energy? O A Energy is released when the reactants begin to react. O B. Energy lost to the environment during the reaction must be replaced.

What is the concentration of a solution in which 75 g of C12H22O11are dissolved in 600. mL of water?

Write two balanced equations 1. Dissolving of Solid Sodium Hydroxide in Water 2. The reaction of Sodium Hydroxide Solution with Hydrochloric Acid

There is inverse relation between pressure and diffusion in liquid phase? •True •False

What do you need in order to do a stoichiometric calculation? (Choose multiple) Balanced Chemical Equation Molar masses of compounds involved The type of reaction taking place Oxidation Numbers

The correct mathematical expression for finding the molar solubility (s) of sn (oh) 2 is:

18. which bond is most polar? H--F H--Cl H--Br H--I

What kind of reaction is ca (s) + h3po4 (aq) ca3 (po4) 2 (s) + h2 (g)