Class 5 Science Question Answers - Solids, Liquids and Gases

Q1: What is matter, and what are its three states?
Ans: Matter is anything that occupies space and has mass. Matter exists in three states: solids, liquids, and gases.

Q2: What are molecules, and how are they related to matter?
Ans: Molecules are tiny particles that constitute matter. They serve as the fundamental building blocks of matter and possess all the properties of the substance to which they belong.

Q3: Can we see molecules with our naked eyes? Why or why not?
Ans: No, we cannot see molecules with our naked eyes because they are extremely tiny and fall below the resolution limit of human vision.

Q4: Explain the difference between atoms and molecules.
Ans: Atoms are the smallest units of matter that cannot be divided further. In contrast, molecules are formed when two or more atoms bond together and exhibit the properties of the substances they constitute.

Q5: How do atoms of the same kind combine to form elements?
Ans: Atoms of the same kind combine to form elements, which are the most basic substances found in nature.

Q6: Provide an example of a compound and explain how it is formed.
Ans: Water is a compound composed of two elements: hydrogen and oxygen. These elements combine chemically to form water molecules.

Q7: Describe the arrangement of molecules in solids, liquids, and gases.
Ans: In solids, molecules are tightly packed and have a strong force of attraction. In liquids, molecules are less closely packed with some intermolecular space. In gases, molecules are far apart and have large intermolecular spaces.

Q8: What is a solution, and how is it formed?
Ans: A solution is a mixture formed when a solute dissolves in a solvent. It is formed when molecules of the solute occupy the space between the molecules of the solvent.

Q9: Explain the factors that can affect the solubility of substances.
Ans: The solubility of substances can be affected by factors like stirring a solution and temperature. Some substances dissolve quickly when stirred, and more sugar can dissolve in hot water than in cold water.

Q10: What are physical changes and chemical changes? Provide examples of each.
Ans: Physical changes are temporary changes that can be reversed. No new substances are formed. Examples include boiling, melting, freezing, and shredding. Chemical changes are permanent changes that cannot be reversed. New substances are formed. Examples include burning, cooking, rusting, and rotting.