Name: Date: Period:

Chemistry Second Semester Exam

1) The compound HNO3 can be described as an:

(A) Acid and an electrolyte

(B) Acid and a nonelectrolyte

(C) Base and an electrolyte

(D) Base and a nonelectrolyte

2) Find the missing information below: C2H4 (g) + 3 O2 (g) 2 CO2 (g) + 2 H2O (l) ΔH = -1411. kJ 2 CO2 (g) + 3 H2O (l) C2H6 (g) + 7/2 O2 (g) ΔH = ? H2 (g) + 1/2 O2 (g) H2O (l) ΔH = -285.8 kJ C2H4 (g) + H2 (g) C2H6 (g) ΔH = -137. kJ A) -1560 kJ B) +1263 kJ C) +1560 kJ D) -1263 kJ 3) Which statement best describes gamma radiation? (A) It has a mass of 1 and a charge of 1. (B) It has a mass of 0 and a charge of –1. (C) It has a mass of 0 and a charge of 0. (D) It has a mass of 4 and a charge of +2.

4) A sample of helium gas has a volume of 900. milliliters and a pressure of 2.50 atm at 298 K. What is the new pressure when the temperature is changed to 336 K and the volume is decreased to 450. milliliters? (A) 0.177 atm (B) 4.43 atm (C) 5.64 atm (D) 14.1 atm 5) Given the reaction: Ba(OH)2(aq) + H2SO4(aq) -->BaSO4(s) + 2 H2O(l) + energy As the barium hydroxide solution is added to the solution of sulfuric acid, the electrical conductivity of the acid solution decreases because the (A) volume of the reaction mixture increases (B) temperature of the reaction mixture decreases (C) concentration of ions increases (D) concentration of ions decreases 6) Which chemical equation represents an acid-base reaction? (A) HC2H3O2(aq) + NaOH(aq) •--> NaC2H3O2(aq) + H2O(l) (B) C3H8(g) + 5 O2(g)•--> 3 CO2(g) + 4 H2O(l) (C) Zn(s) + 2 HCl(aq)•--> ZnCl2(aq) + H2(g) (D) BaCl2(aq) + Na2SO4(aq) ••--> BaSO4(s) + 2 NaCl(aq)

DO NOT WRITE

ON THIS EXAM!!!

You may use

scratch paper.

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7) The kinetic molecular theory assumes that the particles of an ideal gas (A) are in random, constant, straight-line motion (B) are arranged in a regular geometric pattern (C) have strong attractive forces between them (D) have collisions that result in the system losing energy 8) Which formula represents an electrolyte? (A) CH3OCH3 (B) CH3OH (C) CH3COOH (D) C2H5CHO

10) Which solution below is supersaturated?

11) Sulfuric acid, H2SO4(aq), can be used to neutralize barium hydroxide, Ba(OH)2(aq). What is the formula for the salt produced by this neutralization? (A) BaS (B) BaSO2 (C) BaSO3

(D) BaSO4

12) Which aqueous solution is the best conductor of an electrical current? (A) 0.01 M CH3OH (B) 0.01 M KOH (C) 0.1 M CH3OH (D) 0.1 M KOH

(A) (B) (C)

9)

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13) How are HNO3(aq) and CH3COOH(aq) similar? (A) They are acids and they turn blue litmus red. (B) They are acids and they turn red litmus blue. (C) They are bases and they turn blue litmus red. (D) They are bases and they turn red litmus blue 14) Copper metal has a specific heat of 0.385 J/g*°C and a melting point of 1083°C. Calculate the amount of heat required to raise the temperature of 22.8 g of copper from 20.0°C to 875°C. Your answer should be to 1 significant figure. A) +8000 J B) -8000 J C) +7505 J D) -7505 J

15) A student adds solid KCl to water in a flask. The flask is sealed with a stopper and thoroughly shaken until no more solid KCl dissolves. Some solid KCl is still visible in the flask. The solution in the flask is (A) saturated and is at equilibrium with the solid KCl (B) saturated and is not at equilibrium with the solid KCl (C) unsaturated and is at equilibrium with the solid KCl (D) unsaturated and is not at equilibrium with the solid KCl 16) Which reactants form the salt CaSO4(s) in a neutralization reaction? (A) H2S(g) and Ca(ClO4)2(s) (B) H2SO3(aq) and Ca(NO3)2(aq) (C) H2SO4(aq) and Ca(OH)2(aq) (D) SO2(g) and CaO(s)

17) A sample of a gas is contained in a closed rigid cylinder. According to kinetic molecular theory, what occurs when the gas inside the cylinder is heated? (A) The number of gas molecules increases. (B) The number of collisions between gas molecules per unit time decreases. (C) The average velocity of the gas molecules increases. (D) The volume of the gas decreases. 18) A substance is classified as an electrolyte because (A) it has a high melting point (B) it contains covalent bonds (C) its aqueous solution conducts an electric current (D) its aqueous solution has a pH value of 7

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20) What amount of heat is required to completely melt a 29.95-gram sample of H2O(s) at 0°C to 37˚C? The specific heat of ice is 2.01 J/g*˚C (A) 334 J (B) 2260 J (C) 1.00 × 103 J (D) 1.00 × 104 J 21) Which ion is the only negative ion produced by a base in water? (A) NO3– (C) OH– (B) Cl– (D) H–

22) Which nuclear decay emission consists of energy, only? (A) alpha particle (C) gamma radiation (B) beta particle (D) positron

an acid-base 19)

23)

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All answers must be in 1 significant digit and answered on the Free Response Page. 24) A sample of an unknown metal has a mass of 120.7 g. As the sample cools from 90.5°C to 25.7°C, it releases 7020 J of energy. What is the specific heat of the sample? 0.9 J/g*°C 25) The gases in a hair spray can are at a temperature of 27oC and a pressure of 2.04 atm. If the gases in the can reach a pressure of 6.12 atm, the can will explode. To what temperature must the gases be raised in order for the can to explode? 900K 26) A gas has a volume of 300 mL at 300 mm Hg. What will its volume be if the pressure is changed to 500 mm Hg? 200 mL 27) A gas has a volume of 4 liters at 50 oC. What will its volume be (in liters) at 100oC? 5 L 28) A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressures of the three gases in the tank are 35 atm of O2, 5 atm of N2, and 25 atm of He, what is the total pressure inside of the tank? 70 atm 29) What volume would a sample of gas have if the pressure is 8.2 atm, the number of gas particles is 2.0 moles, and the temperature is –73 degrees Celsius? 4 L