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CNMS ICSE - 7 Std
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Answer in one line

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Chapter: 01. Matter And Its Composition

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Answer in One Line

What is the fundamental difference between the mass and weight of an object?
Answer: Mass is the quantity of matter contained in an object and remains constant at all places, whereas weight is the force with which the earth attracts the object and changes from place to place.
How do atoms and molecules combine to form matter?
Answer: Atoms join together to form molecules, and molecules combine together to form matter.
What is the atomic composition of an oxygen molecule?
Answer: An oxygen molecule is made up of two atoms of oxygen.
What is the atomic composition of a nitrogen molecule?
Answer: A nitrogen molecule is made up of two atoms of nitrogen.
Why does the water level in a beaker return to its initial mark after sugar completely dissolves?
Answer: The water level returns to its initial mark because the dissolved sugar particles break into smaller particles and get accommodated in the spaces between the water particles.
How does the intermolecular force of attraction depend on the intermolecular space?
Answer: When the intermolecular space is very small, the intermolecular force of attraction is stronger, and when the space is larger, the force is weaker.
Why are solids rigid and incompressible?
Answer: Solids are rigid and incompressible because their molecules are very closely packed with negligible intermolecular space and very strong intermolecular force of attraction.
What are the shape and volume characteristics of a liquid?
Answer: A liquid has a definite volume but no definite shape, taking the shape of the container in which it is kept.
Why are gases highly compressible and capable of moving in all directions?
Answer: Gases are highly compressible and free to move in all directions because their molecules are far apart, with very large intermolecular spaces and negligible intermolecular forces of attraction.
Which solids are soluble in water and which are insoluble?
Answer: Solids like sugar and common salt are soluble in water, whereas solids like sand, mud, and wood are insoluble in water.
Give examples of miscible (soluble) and immiscible (insoluble) liquids in water.
Answer: Liquids like vinegar, sugar syrup, and alcohol are miscible in water, while liquids like oil and diesel are immiscible in water.
Which gases are readily soluble in water and which are insoluble?
Answer: Gases like ammonia and chlorine are readily soluble in water, whereas hydrogen is insoluble.
Define the interconversion of states of matter.
Answer: The interconversion of states of matter is the process by which matter changes from one state to another and back to its original state without any change in its chemical composition.
What are the temperature conditions required for water to transition into steam and ice respectively?
Answer: Water transitions into steam upon heating at 100°C, and transitions into ice upon cooling at 0°C.
How can gases like oxygen and nitrogen be stored in a liquid state?
Answer: Gases can be liquefied and stored in a liquid state by applying high pressure, which brings their molecules closer together.
Why does liquefied petroleum gas (LPG) come out of a cylinder as a gas when the regulator valve is opened?
Answer: LPG comes out as a gas because opening the regulator valve releases the high pressure, allowing the liquid to expand back into its gaseous state.
What are some common examples of substances that undergo sublimation?
Answer: Common examples of substances that undergo sublimation are camphor, naphthalene, and ammonium chloride.
Explain the transition of wax when it is heated and cooled.
Answer: When solid wax is heated, it melts into liquid wax and eventually vaporizes, and when cooled, the liquid wax freezes back into solid wax.
Why does the fragrance of an incense stick quickly spread throughout a whole room?
Answer: The fragrance spreads quickly because the particles of gases are free to move in all directions and diffuse very fast.
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