State Of Matter Trivia Quiz For 7th Grade

At its melting point, an ice cube undergoes a phase change from a solid to a liquid. This is because the melting point is the temperature at which the solid ice gains enough energy to break its rigid structure and transition into a more fluid state. Therefore, the correct statement is that an ice cube becomes liquid at its melting point.

Melting is the correct answer because it refers to the process by which a substance changes from its solid state to its liquid state. This occurs when heat is applied to a solid, causing its particles to gain enough energy to break free from their fixed positions and move more freely, resulting in the substance becoming a liquid.

 A pencil does not take the shape of the container it is in because it is a solid object with a fixed shape. Unlike liquids such as oil and water and gasses like air, solids have a fixed shape regardless of the container they are placed in.

Water is a liquid, and liquid particles can slide against each other easily. This allows water and other liquid particles to take the shape of their containers. 

Water is an incompressible substance, meaning that its volume cannot be easily reduced by applying pressure. Unlike gasses, which can be compressed, water molecules are tightly packed together and have very little empty space between them. Therefore, it is not possible to compress water in a jar to reduce its volume easily.

While most are familiar with the three classical states of matter—solid, liquid, and gas—there are additional states that are less commonly discussed outside of physical sciences:
Plasma: Often considered the fourth state of matter, plasma is an ionized state of matter similar to gas but with a key difference: it contains free ions and electrons which allow it to conduct electricity. Plasma is what stars are made of and is commonly found in neon signs and plasma TVs.
Bose-Einstein Condensate (BEC): This state of matter was predicted by Satyendra Nath Bose and Albert Einstein in the early 20th century but was first created in the laboratory in 1995. It occurs at temperatures very close to absolute zero, where atoms begin to occupy the same space and quantum state, essentially behaving as a single quantum entity rather than as independent particles.

The correct answer is "All the above statements are right." This is because the statements in options a, b, and c are all individually correct. In solids, the molecules are packed the closest together, in gasses, the molecules are spread out the most, and in liquids, the molecules are packed closer together. Therefore, all three statements are true, making option d incorrect.

The five states of matter are:
Solid: Matter with a definite shape and volume, where particles are closely packed and vibrate in place.
Liquid: Matter with a definite volume but no definite shape, where particles are close but can move past each other.
Gas: Matter with no definite shape or volume, where particles are far apart and move freely.
Plasma: An ionized state of matter with free electrons and ions, found in stars and neon lights.
Bose-Einstein Condensate (BEC): A state of matter formed at near absolute zero, where particles occupy the same space and quantum state, behaving as a single quantum entity.

Gas has the ability to spread itself thinner and thinner and fill the entire volume of the container. In the gas state, the particles are highly energetic and move freely, causing them to spread out and fill the available space.