All of the following statements are true EXCEPT:
A. pure rubber is a hydrocarbon derived from the latex of a tree grown in all of the subtropical areas of the world.
B. rubber freezes at only 500F and becomes sticky at 860F.
C. rubber swells when contacted by many liquids and is damaged by sunlight.
D. for rubber to be useful, it must be vulcanized by heat to make it stable.
Answer: B
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The kissing ball foundation base may be _____
A) wire only B) styrofoam C) wood D) none of the above
One horsepower of work energy equals the amount of work done when lifting ____________________ pounds to the height of ____________________ foot in ____________________ minute.
Fill in the blank(s) with the appropriate word(s).
Which of the following properties of the system would you expect to change as a result of this heating?
A system is in vapor-liquid-liquid equilibrium. One liquid phase contains 96% A and 4% B. The other liquid phase contains 99% B and 1% A. The vapor phase contains 43% A and 57% B. All compositions are on a molar basis. A small amount of heat is added to the system. At the end of the heating, the system is again in vapor-liquid-liquid equilibrium and still at the original system pressure. A. The temperature B. The mole fraction of A in the first liquid phase C. The mole fraction of A in the vapor phase D. The mass of the vapor phase E. All of the above
A 12 VP sine wave equals ________
A) 24 VPP B) 7.64 VAVG C) 8.48 VRMS D) all of these