Please mark below all of the statments that correctly describe the physical properties of glass.
Glasses do not have slip systems.
Glasses consist of both covalent and ionic bonding.
Glasses are brittle at room temperature.
Glasses are amorphous and have no long range symmetry.
The volume of a sample of glass depends on its cooling rate.
Glasses must consist of network formers and modifiers.
Glasses do not have slip systems
Glasses are brittle at room temperature Glasses are amorphous and have no long range symmetry
The volume of a sample of glass depends on its cooling rate
To determine which statements correctly describe the physical properties of glass, let's go through each one and explain how to arrive at the answer.
1. Glasses do not have slip systems.
This statement is true. Unlike crystalline materials, glasses do not have a regular atomic structure, which means they do not have slip systems. Slip systems are responsible for the plastic deformation of crystalline materials under stress.
2. Glasses consist of both covalent and ionic bonding.
This statement is also true. Glasses can have a combination of covalent and ionic bonding. Covalent bonding involves the sharing of electrons between atoms, while ionic bonding involves the transfer of electrons between atoms with opposite charges. The presence of both types of bonding contributes to the unique properties of glasses.
3. Glasses are brittle at room temperature.
This statement is true. At room temperature, glasses are generally brittle, meaning they tend to fracture rather than deform when subjected to stress. This is due to the lack of dislocation motion that can absorb stress in crystalline materials.
4. Glasses are amorphous and have no long-range symmetry.
This statement is true. Glasses are classified as amorphous materials, meaning they lack long-range order or symmetry in their atomic arrangement. Unlike crystalline materials, which have a repeating pattern of atoms, glasses have a disordered, non-crystalline structure.
5. The volume of a sample of glass depends on its cooling rate.
This statement is false. The volume of glass is not primarily dependent on cooling rate but rather on the composition of the glass-forming materials. Cooling rate can impact the formation of defects or the ability of the glass to fully relax into its preferred structure, but the volume is determined mainly by the chemical composition.
6. Glasses must consist of network formers and modifiers.
This statement is true. Glasses typically consist of two types of components: network formers and modifiers. Network formers, such as silicon dioxide (SiO2), form the backbone of the glass structure, while modifiers, such as sodium oxide (Na2O) or calcium oxide (CaO), help disrupt the network and provide other desired properties.
By evaluating each statement individually, we can determine that statements 1, 2, 3, 4, and 6 correctly describe the physical properties of glass.