QUIZ METALS

• Which metal has the highest tensile strength, due to its strong metallic bonds and high atomic density, allowing it to withstand extreme forces without deformation?

  
  

  Answer: Tungsten
• What term refers to the property of a metal that allows it to be drawn into thin wires?

  
  

  Answer: Ductility
• It is also called “i-type semiconductors” that is composed of only one kind of material. Silicon and germanium are two examples.

  
  

  Answer: Intrinsic Semiconductors
• What is the process of introducing impurities into a semiconductor to alter its electrical properties intentionally?

  
  

  Answer: Doping
• These are a type of extrinsic semiconductor in which the dopant atoms are capable of providing extra conduction electrons to the host material.

  
  

  Answer: N-type Semiconductors
• This is the energy difference between the valence band and the conduction band, which determines a material's electrical conductivity.

  
  

  Answer: Band Gap
• The volatile compound formed when carbon monoxide gas is passed over the impure nickel metal.

  
  

  Answer: Tetracarbonyl Nickel
• A method for purifying nickel using carbon monoxide gas.

  Answer: Mond Process
• What describes how a material reacts to external forces like pushing, pulling or twisting?

  
  

  Answer: Mechanical Properties of Metals
• If ductility is the material's response to tensile stress, then malleability is the metal's response to ____ stress.

  
  

  Answer: Compressive
• What is the process of electrolyzing a mixture of aluminum oxide and cryolite to produce aluminum and oxygen gas?

  
  

  Answer: Hall Process
• Calcium hydroxide [Ca(OH)2] is commonly known as _____________.

  
  

  Answer: Slaked lime or hydrated lime
• The alloy of iron with a small amount of carbon (less than 2%) has improved properties compared to cast iron and is more malleable.

  
  

  Answer: Steel
• Product obtained from iron ore after the reduction process, which contains up to 5% carbon and is brittle.

  
  

  Answer: Pig Iron
• _________ does not form a carbide but increases hardness by retarding dislocation movement.

  
  

  Answer: Carbon
• The element Niobium is also known as _____________.

  
  

  Answer: Columbium
• A mineral deposit concentrated enough to allow economical recovery of a desired metal is known as ___________.

  
  

  Answer: Ore
• An amalgam is an alloy of ____________ with another metal or metals.

  
  

  Answer: Mercury
• Most major metallurgical processes now in use involve ___________, which are procedures carried out at high temperatures.

  
  

  Answer: Pyrometallurgy
• What property of a material retains the deformation produced under load permanently?

  
  

  Answer: Plasticity
• Which of the following metals is a liquid at room temperature?

  
  

  Answer: Mercury
• 2. What underlying feature of metallic bonding primarily facilitates the efficient conduction of electricity in metals?

  
  

  Answer: The delocalization of electrons within the metal lattice
• 3. Which of the following statements best describes the nature of metallic bonding and its effect on the solubility of metals in polar solvents?

  
  

  Answer: The delocalization of electrons in a metallic lattice results in non-polar bonds, which contributes to the insolubility of metals in polar solvents like water.
• 4. To obtain a p-type semiconductor, germanium must be doped with

  
  

  Answer: Indium
• 5. Which of the following statements is true regarding the band gap in insulators, Conductors have a large band gap, while insulators have a small band gap.

  
  

  Answer: Insulators have a large band gap, while conductors have overlapping bands.
• 6. In a p-type semiconductor, which element is typically used to create more holes in the valence band?

  
  

  Answer: An element with fewer electrons than the semiconductor
• 7. What happens to the less electropositive metals, such as gold and silver, during the electrolysis of copper?

  
  

  Answer: They fall to the bottom of the cell
• 8. What happens to the impurities in the zone refining process?

  
  

  Answer: They dissolve in the molten metal
• 9. What are the two important keys in understanding the mechanical properties of metals?

  
  

  Answer: Stress and strain
• 10. What sets hardness apart from strength?

  
  

  Answer: Hardness is the metal's resistance to deformation when subjected to stress at the same spot repeatedly, while strength refers to how much force an object can withstand without bending or breaking.
• What is the first step in the Solvay Process?

  
  

  Answer: Dissolving of ammonia in a saturated solution of sodium chloride.
• 12. Anhydrous aluminum oxide is also known as ______.

  
  

  Answer: Corundum
• 13. What is the primary function of coke in the blast furnace?

  
  

  Answer: To provide heat and carbon for the reduction of iron ore
• 14. In the basic oxygen process, which element is primarily oxidized and removed from the molten iron to produce steel?

  
  

  Answer: Carbon
• 15. Sulfur is an alloying element that can be added to steel, and it is limited at what certain percentage?

  
  

  Answer: 0.05%
• 16. High alloy steel contains a high percentage of alloying elements often above what percentage?

  
  

  Answer: 8%
• 17. Phosphorus increases strength and hardness and improves machinability but what kind of mark does phosphorus add?

  
  

  Answer: Brittleness or cold shortness
• 18. What do you call the waste materials usually composed of clay and silicate minerals?

  
  

  Answer: Gangue
• 19. What method is used in the separation of minerals and waste materials mentioned in the previous question?

  
  

  Answer: Flotation
• 20. Since copper is a good thermal conductor, then it is also a good _______.

  
  

  Answer: Electrical Conductor