Reference no: EM132800232

1. One method of corrosion prevention for iron is the use of protective coatings. Which type of coating would most likely be the most effective over a long period of time?

a. nickel. b.chromium c. plastic d.wax. e. steel

2 Corrosion of iron is accelerated by

a.low humidity. b. lack of oxygen. c low pH. d. low temperature. e.nonelectrolytes

3 Galvanized steel is an effective method of corrosion prevention for all of the following reasons except

a.Zinc is a more active metal than iron. bZinc is less electronegative than iron. c. Zinc forms a protective layer on the iron. d.Zinc is a relatively hard metal compared to iron. e.A spontaneous cell is created when the zinc coating is broken

4 The kinetic molecular theory includes all of the following except

a.molecules attract one another. b.particles are small compared to the volume they occupy. c.molecules move in straight line motion. d.molecules collide elastically with one another. e. ecules collide elastically with surrounding objects

5 An example of a physical change process in a chemical industry is

a.deposit of gold on a metal through electrolysis b. decomposition of limestone in the Solvay process. c.combustion of sulfur in the contact process for sulfuric acid d.recovery of salt by evaporation of water from a salt lake. e.production of ammonia from nitrogen and hydrogen in the Haber process

6 An example of a chemical change process in a chemical industry is

a.crude oil fractionally distilled in an oil refinery. b.ecovery of salt by evaporation of water from a salt lake. c.lime added to water to produce slaked lime in the Solvay process d.nitrogen condensed from air for use in the Haber process e.CFCs from automobile air conditioners diffuse in the upper atmosphere

7 The reaction of silver nitrate with zinc would be classified as a

a. combustion reaction. b. synthesis reaction. c.double displacement reaction d.decomposition reaction. e.decomposition reaction

8.Baking soda can be used to neutralize some battery acid that has leaked or spilled. This reaction would be classified as a

a.synthesis reaction. b.decomposition reaction. c. combustion reaction d.single displacement reaction. e.double displacement reaction

9 The substance that would be expected to form a precipitate as a product of a chemical reaction is

a.silver hydroxide. b. calcium sulfide. c.sodium phosphate. d.lithium chloride. e.chromium(III) sulfate

10 Engines are often constructed with aluminum alloys rather than pure aluminum because

a.alloys are lighter. b.pure aluminum is flammable. c.alloys are stronger. d.pure aluminum is easily worn away by corrosion e. pure aluminum is too expensive