Question : 11.The formation of rust (Fe2O3) an exposed piece of metal : 1318409

Economics

11.The formation of rust (Fe2O3) on an exposed piece of metal typically takes several months. Which of the following statements is NOT a reasonable assumption about this chemical reaction?

4Fe(s) + 3O2(g) ? 2Fe2O3(s)

A) The reaction has a low reaction rate.

B) The reaction has low activation energy.

C) The rusting of iron would occur faster in the warmer summer months than in the cooler winter months.

D) The rusting of iron would occur slower at higher altitudes where the concentration of oxygen is lower.

E) Adding a catalyst would increase the rate of the formation of rust.

12.The rate of a chemical reaction increases with an increase in temperature. Which of the following correctly explains why?

A) At higher temperatures, the activation energy is increased.

B) At higher temperatures, the activation energy is decreased.

C) At higher temperatures, more reactant molecules are present and collisions occur more frequently.

D) At higher temperatures, reactant molecules move faster, collide more often, and produce more effective collisions.

E) At higher temperatures, a catalyst is usually present.

13.What is the equilibrium constant expression for the reaction shown below?

MgCO3(s) MgO(s) + CO2(g)

14.The rate of a chemical reaction increases with an increase in concentration of one or more of the reactants. This is best explained by which of the following statements?

A) The increased concentration of reactants increases the temperature of the molecules.

B) The increased concentration of the reactants increases the activation energy of the reaction.

C) The increased concentration of the reactants increases the speed of the molecules.

D) The increased concentration of the reactants increases the frequency of effective collisions.

E) The increased concentration of reactants decreases the activation energy.

15.For the reaction shown below, Keq=2×1011. Which of the following statements concerning this system at equilibrium is true?

2CO(g) + O2(g) 2CO2(g)

A) The equilibrium lies to the left.

B) The equilibrium solution contains equal amounts of CO, O2, and CO2.

C) The reaction is very fast, due to the high value for Keq.

D) The equilibrium solution contains predominantly CO2.

E) The equilibrium system contains almost twice as many reactant molecules as product molecules.

16.What is the name and symbol of the thermodynamic quantity that represents the heat absorbed or liberated in a chemical reaction at constant pressure?

A)Enthalpy Change, ?HD)Both A and B are correct.

B)Entropy Change, ?SE)None of the choices are correct.

C)Free Energy Change, ?G

17.What thermodynamic quantity is the ultimate predictor of reaction spontaneity?

A)Enthalpy Change, ?HD)Both B and C are correct.

B)Entropy Change, ?SE)None of the choices are correct.

C)Free Energy Change, ?G

18.What instrument is used for measuring the heat energy absorbed or released in a chemical reaction?

A) thermometer B) calorimeter C) thermos D) balance E) scale

19.How many small calories are equivalent to one nutritional Calorie?

A) 10 B) 100 C) 1,000 D) 10,000 E) 100,000

20.A carbohydrate sample weighing 0.235 g was found to have a fuel value of 3.84 kJ. What is the fuel value of one gram of this carbohydrate, in nutritional Calories?

A) 3,910 Cal B) 0.535 Cal C) 16.3 Cal D) 643 Cal E) 3.91 Cal

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July 1, 2023

61.When there is a shortage in a market, prices are likely to:

A. Fall because buyers do not wish to buy as much as sellers want to sell.

B. Rise because some buyers will offer to pay a higher price.

C. Fall because sellers are likely to reduce their production if prices rise.

D. Rise because the government will put a price ceiling in place.

62.If a market shortage exists:

A. The invisible hand will work to reduce the price.

B. The only solution is for the government to raise the price.

C. Producers will compete for customers by reducing prices.

D. Consumers will compete for the product by offering to pay more.

63.A market surplus occurs when:

A. People cannot buy the amount of goods and services that they are willing and able to buy.

B. The price is less than the equilibrium price.

C. The quantity supplied exceeds the quantity demanded at a given price.

D. There is a price ceiling.

64.When there is a surplus in a market, prices are likely to fall because:

A. Buyers do not wish to buy as much as sellers want to sell.

B. Some buyers will offer to pay a higher price, initiating a move up the supply curve.

C. Sellers are likely to increase their production.

D. Buyers will wait for the government to establish a price floor.

65.If a market surplus exists:

A. The only resolution is for the government to set the price.

B. Consumers will compete for the product buy offering to pay more.

C. Producers will compete for customers by reducing prices.

D. The equilibrium price is equal to the price ceiling.

66.If demand is constant, a decrease in the supply of gasoline will cause the equilibrium price:

A. To rise and quantity to fall.

B. And quantity both to rise.

C. To fall and quantity to rise.

D. And quantity both to fall.

67.If demand is constant, a leftward shift in the supply curve will result in:

A. A decrease in equilibrium quantity and a lower equilibrium price.

B. An increase in equilibrium quantity and a lower equilibrium price.

C. A decrease in equilibrium quantity and a higher equilibrium price.

D. An increase in equilibrium quantity and a higher equilibrium price.

68.The price of chocolate candy bars rises. This could be due to:

A. A decrease in the wage rate paid to workers in the candy bar factories.

B. A decrease in the cost of chocolate, which is used to produce candy bars.

C. A subsidy by the federal government for the producers of chocolate candy bars.

D. A decrease in the number of chocolate candy bar producers.

69.If demand is unchanged, a rightward shift in the supply curve for plasma TVs will cause:

A. A decrease in equilibrium quantity and a higher equilibrium price.

B. An increase in equilibrium quantity and a higher equilibrium price.

C. An increase in equilibrium quantity and a lower equilibrium price.

D. A decrease in equilibrium quantity and a lower equilibrium price.

70.Which of the following would cause a decrease in the price of automobiles?

A. A technological advance in automobile manufacturing.

B. An increase in the wages paid to automobile assembly line workers.

C. A decrease in the cost of gasoline.

D. An increase in the number of buyers.