(b)

(aq) (aq) BeSO, (aq) + H,O(1) ↑ 4.

(1) A metal that gets covered with a protective film of its oxide (Al, Cu, Ag)(2) A metal which burns in air with golden flame (Zn, K, Na)(3) A metal which can displace hydrogen from boiling water as well as steam (K, Zn, Fe)

6. (a) What is, the difference between Science and Green Environmental Chemistry? (b) How can a chemical process be made energy efficient?

(a) Write the chemical equation for the complete combustion of butane.  (b) Why is it not advisable to use a butane stove inside a tent?

(A) from the choices if both sentences are true (B) if both sentences are false (C) if the first sentence is true but the second is false (D) if the first sentence is false but the second is true.

2. Write the expression for Kc and Kp if applicable, for the following reversible reactions at equilibrium: (a) HF(aq) + H;0() H,0 (aq) + F (aq) (b) 2NO(g) + 0,(g) 2NO0,(g) (C) CH,COOH(aq) + C,H,OH(aq) CH,C0OC,H,(aq) + H,O()

2 (a) In this investigation, you will use a polystyrene-cup calorimter to determine the amount of heat released during acid-base neutralization reactions. Find information in your textbook, an encyclopedia, or a web site about calorimetry. Sketch the apparatus for a polystrene-cup calorimeter. (b) For more precise heat of reaction measurnments, chemists use a device called bomb calorimeter. How is a bomb calorimeter similar to and different from a polystyrene-cup calorimeter?

4. True or False (1) Chlorine demand is the difference between total chlorine and free chlorine (2) In raw wastewater samples, most of nitrogen is in the form of nitrate. (3) If 10 mg/L of NH3-N is converted to nitrate, the nitrate concentration is 10 mg/L as N. (4) Free chlorine consists of hypochlorous acid and hypochlorite. (5) Chloramines is a weaker disinfectant than free chlorine. (6) Na2HPO4 contributes to the orthophosphates. (7) For phosphorus analysis, the purpose of the autoclave is to kill the phosphorus bacteria which interferes colorimetric analysis. (8) Chloride is an effective disinfectant for water and wastewater treatment. (9) "Crown" corrosion is caused by the corrosive action of H₂SO4. (10) Breakpoint chlorination can be used for removal of ammonia.

(4) The normal melting point of gold is 1064.5 °C and its boiling point is 2660 °C. (a) Convert these two values to the Fahrenheit and Kelvin scales. (b) Find the difference between those two values in Celsius. (c) Repeat (b) using the Kelvin scale. (6) The Eiffel tower is built from iron and it is about 324 m high. Its coefficient of linear expansion is approximately 12 x 10-6 (C°)¯l and assumed constant. What is the increase in the tower's length when the temperature changes from 0°C in winter to 30°C?