Class 5 Science States of Matter Notes and Solutions | Complete Answer Sheet

Class 5 Science States of Matter  questions and answers with MCQs, fill in the blanks, true/false, short and long answers, and HOTS questions.

A.     Tick (✓) the right answer

 

1. 1. They have little intermolecular space between the molecules.
   Ans. (a) Solids
2. 2. Which is an immiscible liquid in water?
   Ans. (b) Kerosene
3. 3. Which of the following is a physical change?
   Ans. (a) Melting of butter
4. 4. Which can fill up all the available space?
   Ans. (c) Steam
5. 5. Which of the following is a chemical change?
   Ans. (d) Burning of coal

B. Fill in the blanks

 

1. Butter melts when ________.
   Ans. heated
2. The change of solid into liquid on heating is called ________.
   Ans. melting
3. The matter ________ on cooling.
   Ans. contracts
4. When we heat water, it ________.
   Ans. evaporates
5. The arrangement of ________ decides the states of matter.
   Ans. molecules

C. Match the following

 

Physical changes → Temporary change

Solid → Wood

Chemical changes → Permanent change

Liquid → Milk

Gas → Oxygen

D. True/False

 

1. Rusting is a physical change.
   Ans. False
2. Melting and condensation require addition of heat.
   Ans. False
3. Some gases make solution in water.
   Ans. True
4. Physical change gives rise to a new substance.
   Ans. False
5. Milk is miscible in water.
   Ans. True

Let’s Think and Answer

 

1. Define condensation.
   Ans. Condensation is the process in which a gas changes into a liquid on cooling.
2. Define freezing.
   Ans. Freezing is the process in which a liquid changes into a solid on cooling.
3. Write two differences between liquids and gases.
   Ans. Liquids have definite volume but no definite shape. Gases have neither definite shape nor definite volume.
4. What is the importance of solubility of gases in water?
   Ans. Dissolved oxygen helps aquatic animals breathe and dissolved carbon dioxide helps aquatic plants make food.
5. Differentiate between melting and evaporation.
   Ans. Melting changes a solid into a liquid. Evaporation changes a liquid into a gas.

Long Answer Questions

 

1. Explain the molecular arrangement in solids, liquids and gases.
   Ans. In solids, molecules are tightly packed with strong attraction. In liquids, molecules are less closely packed and can move. In gases, molecules are far apart and move freely.
2. What do you understand by miscible and immiscible liquids?
   Ans. Miscible liquids mix completely with each other (e.g. milk and water). Immiscible liquids do not mix (e.g. oil and water).
3. Describe contraction and expansion.
   Ans. Expansion is the increase in size on heating. Contraction is the decrease in size on cooling.
4. Describe the processes involved in the change of states of water.
   Ans. Ice melts into water (melting), water changes to vapour (evaporation), vapour changes to water (condensation), and water freezes into ice (freezing).
5. What are physical and chemical changes?
   Ans. Physical changes do not form a new substance and are usually reversible. Chemical changes form a new substance and are usually irreversible.

HOTS Questions

 

1. Bubbles come out when we open a soft drink bottle but not when we open a bottle of mineral water. Why?
   Ans. Soft drinks contain dissolved carbon dioxide gas under pressure. When opened, the gas escapes as bubbles.
2. How do fumes of an incense stick spread in the whole room?
   Ans. Gas particles move freely and spread in all directions by diffusion.
3. How is carbon dioxide dissolved in water useful for aquatic plants?
   Ans. Aquatic plants use dissolved carbon dioxide to prepare their food by photosynthesis.

 

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