Give the formula of the following compounds. a. Sodium hydroxide_____________ b. Potassium phosphate____________ c. Cupper(II) sulfide___________

Write the balanced chemical equation for each reaction below. a. Sodium oxide reacts with carbon dioxide to form sodium carbonate. b. C. d. e. f. i. g. h. Calcium metal reacts with water to form aqueous calcium hydroxide and hydrogen. Potassium nitrate decomposes to form potassium nitrite and oxygen. Internal Barium metal reacts with aqueous iron (III) sulfate to produce aqueous barium sulfate and iron. Aqueous barium chloride reacts with aqueous sodium sulfate to produce barium sulfate and a solution of sodium chloride. Bismuth reacts with fluorine to form the bismuth (V) fluoride. Calcium metal reacts with elemental phosphorus (P4) to produce calcium phosphide. Copper metal reacts with sulfuric acid, H₂SO4, and water to produce copper(II) sulfate pentahydrate and sulfur dioxide. A solution of hydrochloric acid, HCI, reacts with a solid calcium hydrogen carbonate to produce water, carbon dioxide, and calcium chloride.

Please write clearly the answer, as well as the type of compound it is. Such as gas, solid, etc

A recently created chromium-boron compound is a component of Ironman’s armor. It was created by reacting 4.372 g Cr with excess B for form 4.917 of the chromium-boron compound. What is the empirical formula of this compound? When entering the formula place the elements in the following order: Cr, B. For subscripts, write the number after the element it corresponds to. For example, H2O should be written as H2O.