Test: Solids, Liquids & Gases- 1 - Class 4 MCQ

Solid > Liquid > Gas. Solids have the most tightly packed molecules and gases have the least packed molecules.

Conversion of gases into liquids is called condensation.

• When a solid substance dissolves in water, we call it a soluble substance. For example, when you add sugar to water and stir it, the sugar disappears because it dissolves in the water, forming a sugar water solution. So, the statement is True.

• Here's an interesting fact: Did you know that salt, sugar, soap, and orange juice are some examples of substances that can dissolve in water?

In the solid state, the individual particles of a substance are in fixed positions with respect to each other because there is not enough thermal energy to overcome the intermolecular interactions between the particles. As a result, solids have a definite shape and volume. Most solids are hard.

When a substance dissolves in a liquid to make a solution, it is called a solute. For example, when you mix salt in water and it disappears, salt is the solute. This makes the statement TRUE.

Liquids are cool because they can change their shape to fit into any container they are poured into. Imagine pouring juice from a glass to a bowl - the juice takes the shape of the bowl. That's what liquids do!