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Questions and Answers
What property of metals allows them to be drawn into wires?
What property of metals allows them to be drawn into wires?
- Opalescence
- Transparency
- Ductility (correct)
- Brittleness
What temperature is generally regarded as the point at which a substance can conduct electricity to be classified as a metal in physics?
What temperature is generally regarded as the point at which a substance can conduct electricity to be classified as a metal in physics?
- Room temperature
- 500 degrees Celsius
- Absolute zero (correct)
- 100 degrees Celsius
What type of bond between atoms or molecules in a metal gives rise to its properties like ductility and malleability?
What type of bond between atoms or molecules in a metal gives rise to its properties like ductility and malleability?
- Metallic bond (correct)
- Ionic bond
- Covalent bond
- Hydrogen bond
Under what conditions can some materials classified as nonmetals become metallic?
Under what conditions can some materials classified as nonmetals become metallic?
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Which nonmetal gradually becomes a metal at a pressure of between 40 and 170 thousand times atmospheric pressure?
Which nonmetal gradually becomes a metal at a pressure of between 40 and 170 thousand times atmospheric pressure?
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Study Notes
Properties of Metals
- Metals can be drawn into wires due to ductility, which is a result of their ability to deform under tensile stress without breaking.
- Metallic bonding allows layers of atoms to slide over one another, contributing to this property.
Conductivity in Metals
- A substance is typically considered to be a metal when it conducts electricity at temperatures above its melting point, which varies for different metals.
Bonding in Metals
- The properties of ductility and malleability in metals stem from metallic bonds. These bonds involve a 'sea of electrons' that allows atoms to move relative to one another without fracturing.
Transition of Nonmetals
- Certain nonmetals can exhibit metallic properties under extreme conditions, such as high pressure or specific temperature thresholds, allowing them to conduct electricity.
Nonmetal to Metal Transition
- Carbon, specifically in the form of graphite, transitions to a metallic state when subjected to pressures between 40,000 and 170,000 times atmospheric pressure, enhancing its conductivity.
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