FAQs on Introduction to Solids & Characteristics of Solids Video Lecture - Chemistry Class 12 - NEET
|1. What are the different types of solids?
Ans. Solids can be classified into four main types: crystalline solids, amorphous solids, polymeric solids, and composite solids. Crystalline solids have a regular arrangement of atoms or molecules, resulting in a well-defined shape and sharp melting point. Amorphous solids have a disordered arrangement of atoms or molecules, lack a definite shape, and soften gradually upon heating. Polymeric solids are made up of long chains of repeating units, such as plastics. Composite solids are a combination of two or more types of solids, like fiberglass.
|2. What are the characteristics of solids?
Ans. Solids have several characteristic properties:
- They have a definite shape and volume.
- They are rigid and do not flow like liquids.
- Solids have a high density compared to liquids and gases.
- They have strong intermolecular forces that hold their particles together.
- Solids can be either crystalline or amorphous, depending on the arrangement of their particles.
- They have a fixed melting point, at which they change from solid to liquid state.
|3. What is the difference between crystalline and amorphous solids?
Ans. Crystalline solids have a highly ordered arrangement of atoms or molecules, resulting in well-defined geometric shapes and sharp melting points. They exhibit long-range order, meaning that the arrangement of particles repeats periodically throughout the solid. Examples of crystalline solids include salt, diamond, and quartz.
On the other hand, amorphous solids have a disordered arrangement of particles, lacking a well-defined shape and melting point. They do not exhibit long-range order, and their particles are randomly packed. Examples of amorphous solids include glass, rubber, and plastic.
|4. What are the properties of composite solids?
Ans. Composite solids are a combination of two or more types of solids, resulting in unique properties. Some important properties of composite solids are:
- They can have a combination of properties from their constituent solids. For example, a composite material made of a strong and lightweight material with a more flexible material can be both strong and flexible.
- Composite solids can have enhanced strength, stiffness, or toughness compared to individual solids.
- They can exhibit improved resistance to wear, corrosion, or heat.
- Composite solids can be tailored to specific applications by varying the composition and arrangement of their constituent materials.
|5. How are solids different from liquids and gases?
Ans. Solids, liquids, and gases are the three states of matter. Solids have a definite shape and volume, while liquids have a definite volume but no fixed shape (they take the shape of their container) and gases have neither a definite shape nor volume (they expand to fill their container).
Solids have strong intermolecular forces that hold their particles together, resulting in a rigid structure. Liquids have weaker intermolecular forces, allowing their particles to move past each other, causing them to flow. Gases have very weak intermolecular forces, leading to a high degree of particle movement and complete freedom of motion.
Moreover, solids have a higher density compared to liquids and gases. Solids also have a fixed melting point, at which they change from solid to liquid state, while liquids and gases can change their state with changes in temperature and pressure.