Properties of Metals and Alloys

What are the general properties of metals?

• Metals are always brittle and non-lustrous.

• Metals are poor conductors of heat and electricity.

• Metals are good conductors of heat and electricity, malleable, ductile, lustrous, and have high density.

• Metals have low density and are not malleable.

How do metals conduct electricity?

• Metals conduct electricity due to the presence of magnetic fields.

• Metals conduct electricity by trapping electrons in fixed positions.

• Metals conduct electricity through the vibration of atoms.

• Metals conduct electricity through the movement of free electrons.

What is malleability in metals?

• Malleability is the ability of a metal to be shaped or deformed without breaking.

• Malleability is the temperature at which a metal melts.

• Malleability refers to the hardness of a metal.

• Malleability is the ability of a metal to conduct electricity.

Define ductility in the context of metals.

• Ductility is the ability of a metal to be stretched into a wire or deformed without breaking.

• Ductility is the temperature at which a metal melts.

• Ductility refers to the hardness of a metal.

• Ductility is the ability of a metal to resist corrosion.

What is the significance of tensile strength in metals?

• Tensile strength is crucial for determining a metal's ability to resist deformation and failure under tension.

• Tensile strength only affects a metal's weight and density.

• Tensile strength is irrelevant to a metal's performance in construction.

• Tensile strength measures a metal's color and appearance.

How does the atomic structure of metals affect their properties?

• Metals are composed of isolated atoms that do not conduct electricity.

• The atomic structure of metals, characterized by closely packed atoms and free-moving electrons, leads to high electrical conductivity, malleability, and strength.

• The atomic structure of metals is similar to that of gases, leading to low density.

• Metals have a loose atomic structure that makes them brittle.

What is the difference between ferrous and non-ferrous metals?

• Ferrous metals contain iron; non-ferrous metals do not.

• Ferrous metals are lighter than non-ferrous metals.

• Ferrous metals are used exclusively in construction, while non-ferrous metals are not.

• Non-ferrous metals are magnetic; ferrous metals are not.

Explain the term 'alloy' and give an example.

• Copper is an example of an alloy.

• Plastic is an example of an alloy.

• Gold is an example of an alloy.

• Steel is an example of an alloy.

What role do impurities play in the properties of metals?

• Impurities can enhance or degrade the properties of metals, affecting strength, ductility, and conductivity.

• Impurities only improve the conductivity of metals.

• All impurities make metals weaker and less ductile.

• Impurities have no effect on the properties of metals.

How do temperature and pressure affect the properties of metals?

• Temperature increases ductility and conductivity, while pressure enhances strength and alters atomic arrangement.

• Temperature increases brittleness and pressure decreases atomic arrangement.

• Temperature has no effect on metals, and pressure only affects their color.

• Temperature decreases strength and conductivity, while pressure reduces ductility.