Weber, Hazardous Materials Technician Chapter 5

Weber, Hazardous Materials Technician Chapter 5: Chemical and Physical Properties When one substance interacts and combines with another substance, forming one or more different substances describes a(n): (p. 117 ) Chemical compatibility Exothermic reaction Chemical reactivity Endothermic reactivity Which of the following statements BEST describes an exothermic reaction? (p.117 ) A chemical reaction that liberates heat A chemical reaction that absorbs heat A chemical that reacts quickly A chemical that reacts slowly The rate of a chemical reaction depends on several factors. Which of the following factors is CORRECT? (p. 117) The temperature and amount of the material The concentration and the pressure of the material The presence of any catalysts All of above A chemical used to increase the stability of highly reactive chemicals during transport and storage is called a(n): (p. 117) Catalysis Inhibitor Oxidizer Reducing agent A rapid rate of oxidation that releases a large amount of energy very quickly describes: (p. 118) Oxidization Combustion Radiation Corrosiveness A chemicals ability to take electrons from a fuel refers to its: (p.118 ) Oxidizing ability Reducing potential Polymerization ability Combustion potential Which exothermic reaction occurs when a relatively homogenous material is able to react with itself? (p.119 ) Oxidization Combustion Decomposition Polymerization _______________materials may cause severe chemical burns and extensive tissue damage on contact. (p. 120) Cryogenic Corrosive Radioactive Carcinogenic Which of the following statements about the pH scale is CORRECT? (p.120 ) pH is the concentration of electrons in a solution The more protons there are in a solution, the more caustic A pH of seven is considered neutral A pH that is below seven is considered basic Examples of physical properties are: (p.123 ) Boiling point and vapor pressure Ignition temperature Flash point and lower explosive limit Alkalis and caustic A chemical reaction that takes in heat during a reaction describes a(n): (p.117 ) Exothermic reaction Endothermic reaction Combustion Oxidation A chemical reaction that gives off heat is called a(n): (p.117 ) Exothermic reaction Explosion Endothermic reaction Spontaneous combustion If the chemical properties of a substance remain unchanged and the appearance or shape of an substance changes it is called a: (p.123 ) Chemical change Physical change Neither a physical or chemical change Both a physical and chemical change The temperature at which a liquid gives off enough vapor to ignite, but NOT necessarily to sustain combustion describes: (p.138 ) Flame point Fire point Flash point Auto ignition temperature The temperature at which a material will initiate self-sustained combustion without an external ignition source describes: (p.138 ) Auto ignition temperature Flash point Flame point Fire point A material that has the ability to mix completely in all proportions in water is considered to be: (p.133 ) Dissolvable Miscible Soluble Insoluble A weight of a specific volume of liquid compared to the weight of an equal volume of water describes: (p.134 ) Vapor density Proportional weight Mass ratio Specific gravity A chemical in a gaseous form with a vapor density of greater than one will: (p.130 ) Result in a physical change Rise Sink Change it chemical properties The higher the vapor pressure of a chemical: (p. 128 ) The more rapidly the chemical evaporates The slower the chemical evaporates The quicker the vapor will rise in air The quicker the vapor will sink in air The comparison of the volume a specific amount of gas occupies to the volume that the gas occupies at a specific temperature and pressure refers to its: (p.126 ) Vapor-to-mass ratio Vapor-to-gas ratio Expansion ratio Vapor proportionality Answer Key: 1. c 2. a 3. d 4. b 5. b 6. a 7. d 8. b 9. c 10. a 11. b 12. a 13. b 14. c 15. a 16. b 17. d 18. c 19. a 20. c Weber, Hazardous Materials Technician ©2013 by Education, Inc.