2010-10-03_041739_38_questions

2010-10-03_041739_38_questions - 1. To figure out the exact...

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1. To figure out the exact pH of a solution, you’ll need to determine the a.concentration of OH- ions. b.concentration of H+ ions relative to the concentration of OH- ions c.cooncentration of H+ions d. ratio of OH- ions to H+ions 2. In chemical reactions,which of the following is a factor that tends to increase entropy? a. High temperature b. Being in a solid state c. High pressure d. Small, simple molecules 3.When a chemist says that a salt such as potassium chloride is fused, he or she means that the substance is: a. vaporized b.melted c.rapidly reduced d.rapidly oxidized 4. What occurs in the process of ionization? a.Acids dissociate to produce hydroxide ions,as their only negative ions. b.Strong bases ionize almost completely yielding a maximum quantity of hydrogen ions. c. stationary solid ions are produced. d.ions are formed by a dissolved molecular substance 5. The direction o f change in a reaction depends on the combined changes of entropy,heat of reaction,and temperature. If this is express as ^G= ^H-T^S, what would it mean if the value for free energy ( ^G) is zero? a. The reaction is spontaneous b. The reaction is in equilibrium c. The reaction isn’t spontaneous 6. What occurs in a reduction reaction? a. There is no change in the oxidation state b. The oxidation state of an element increases c. A particle gains electrons d. A particle loses electrons 7. What occurs in a reaction in which the reactant is a solid and the product is a gas? a. There is no change in entropy b. The entropy change is most likely negative because the molecules in the solid state are more random than the molecules in the gaseous state. c. The entropy decreases and the sign of ^S most likely would be negative d. ^S most likely would be positive because a gas has greater entropy than a solid.
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8. If one species in a redox reaction undergoes oxidation, what happens to the other species? a. It must undergo oxidation b. It must undergo reduction c. It may under oxidation d. It may undergo reduction 9. Pure ammonia gas (NH3) contains no hydroxyl ions. However, ammonia takes on the characteristic slippery feel of a weak base in water solution because: a. the NH ion has a negative charge b. the water-ammonia reaction produces OH- ions c. the NH ion is positive d. water is a strong electrolyte 10. Spontaneous chemical change is least likely to occur when there’s a/an a. increase in potential energy accompanied by a decrease in entropy b. decrease in potential energy accompanied by an increase in entropy c. increase in potential energy accompanied by an increase in entropy d. decrease in potential energy accompanied by an decrease in entropy 11. Determine the pH of a 0.00001 M solution of the strong acid HNO3.
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This note was uploaded on 04/04/2012 for the course BI, HEALTH 251 taught by Professor N/a during the Spring '12 term at MD University College.

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2010-10-03_041739_38_questions - 1. To figure out the exact...

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