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1. Which of the following statements about steel is false?
[A] Pure iron is relatively soft and ductile because it lacks directional bonding.
[B] It contains carbon atoms in the holes of its iron crystals.
[C] The amount of carbon directly affects the properties of steel.
[D] The presence of carbon-iron bonds in the alloy make steel harder and stronger than pure iron.
[E] All of these are true.
2. What is responsible for capillary action, a property of liquids?
[A] Cohesive forces
[C] Adhesive forces
[D] Surface tension
[E] Two of these
3. When a non polar liquid displays a convex meniscus, which of the following explains this behavior?
[A] It has a low surface tension, and therefore clings to the glass.
[B] The adhesive forces toward the glass are stronger than the cohesive forces.
[C] The cohesive forces are stronger than the adhesive forces toward the glass.
[D] The liquidâ€™s viscosity is low.
[E] None of these
4. You are given the following boiling point data: a) water, H2O 100 Â°C
b) Methanol, CH3OH64.96 Â°C
c) Ethanol, CH3CH2OH78.5 Â°C
d) Diethyl ether, CH3OH2-O -CH2CH334.5 Â°C
e) Ethylene glycol, HO -CH2-CH2-OH 198 Â°C Which one of the above liquids would you expect to have the highest vapor pressure at room temperature?
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