Write a balanced equation for each of the following: (a) A characteristic reaction of Group 1A(1) elements: chunks of sodium react violently with water to form hydrogen gas and sodium hydroxide solution. (b) The destruction of marble statuary by acid rain: aqueous nitric acid reacts with calcium carbonate to form carbon dioxide, water, and aqueous calcium nitrate. (c) Halogen compounds exchanging bonding partners: phosphorus trifl uoride is prepared by the reaction of phosphorus trichloride and hydrogen fl uoride; hydrogen chloride is the other product. The reaction involves gases only.

The first two steps in the industrial synthesis of nitric acid produce nitrogen dioxide from ammonia: 4 NH, (g) + 50, (g)=4 NO (g)+ 6 H,0 (g) K1 2 NO (g) + 0, (g) =2NO,(g) K2 The net reaction is: 4 NH3 (g)+ 70, (g) =4 NO, (g)+6H,0 (g) K Write an equation that gives the overall equilibrium constant K in terms of the equilibrium constants K, and K,. If you need to include any physical constants, be sure you use their standard symbols, which you'll find in the ALEKS Calculator. K

. For each of the following, draw the Lewis structure, predict the ONO bond angle, and give the hybridization of the nitrogen. You may wish to review the chapters on chemical bonding and advanced theories of covalent bonding for relevant examples. (a) NO2           (b) NO-2

Sodium hydrogen sulfate is used as a cleaning agent and as a flux (a substance that promotes the fusing of metals and prevents the formation of oxides). One of the ways in which sodium hydrogen sulfate is manufactured is by reacting sodium dichromate, Na2Cr2O7, with sulfuric acid. This process also forms water and chromium(VI) oxide, CrO3. Write a balanced equation for this reaction. (You do not need to include states.) How many kilograms of sodium dichromate, Na2Cr2O7, are necessary to produce 130.4 kg of sodium hydrogen sulfate? How many kilograms of chromium(VI) oxide are formed when 130.4 kg of sodium hydrogen sulfate is made? What is the minimum volume of 18.0 M H2SO4 solution necessary to react with 874.0 kg of sodium dichromate? What is the maximum mass of sodium hydrogen sulfate, NaHSO4, that can be formed from the reaction of 874.0 kg of sodium dichromate with 400.0 L of 18.0 M H2SO4?

Each of the chemically active Period 2 elements forms sta-ble compounds that have bonds to fluorine.(a) What are the names and formulas of these compounds?(b) Does ΔEN increase or decrease left to right across the period?(c) Does percent ionic character increase or decrease left to right?(d) Draw Lewis structures for these compounds.

Write a balanced equation for the formation of manganese (IV) oxide from its elements

Which description correctly describes a difference betweenthe chemistry of oxygen and sulfur?(a) Oxygen is a nonmetal and sulfur is a metalloid. (b) Oxygencan form more than four bonds, whereas sulfur cannot.(c) Sulfur has a higher electronegativity than oxygen.(d) Oxygen is better able to form π bonds than sulfur.

An electrode has a negative electrode potential. Which statement is correct regarding the potential energy of an electron at this electrode?(a) An electron at this electrode has a lower potential energy than it has at a standard hydrogen electrode.(b) An electron at this electrode has a higher potential energy than it has at a standard hydrogen electrode.(c) An electron at this electrode has the same potential energy as it has at astandard hydrogen electrode.