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Answer key

Chapter: 02. Matter

⁠

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Matter exists in three states: solid, _ _ _ _ _ _ _ _ _ _ _ _ _ _ and gas.

The quantity (amount) of matter contained in a thing (object) is called its _ _ _ _ _ _ _ _ _ _ _ _ _ _.

The temperature remains constant as long as _ _ _ _ _ _ _ _ _ _ _ _ _ _ continues during a state change.

The space between the particles (molecules) of matter is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ space.

The continuous zigzag motion of particles is known as the _ _ _ _ _ _ _ _ _ _ _ _ _ _.

The process during which a solid changes into its liquid state at a fixed temperature on heating is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ or fusion.

The fixed temperature at which a liquid changes into its vapour state is called its _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Matter that grows, moves and reproduces on its own is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ matter.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ balls are used to protect woollen and silk clothes from moths.

Gases are _ _ _ _ _ _ _ _ _ _ _ _ _ _ compressible due to large intermolecular space.

The force of attraction between the same kind of particles is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ force.

Matter that is found in nature is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ matter.

LPG (Liquefied Petroleum Gas) is present in _ _ _ _ _ _ _ _ _ _ _ _ _ _ form in the cylinder due to high pressure.

The process during which a liquid changes into its vapour, at temperature below the boiling point is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Liquids have a definite _ _ _ _ _ _ _ _ _ _ _ _ _ _ but do not have a definite shape.

The smallest particle of matter that exhibits all the properties of matter and has an independent existence is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _.

All the three states of matter expand on heating and _ _ _ _ _ _ _ _ _ _ _ _ _ _ on cooling.

The process by which vapour changes directly into solid on cooling is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.

According to scientists, matter was created in an explosion in the universe called the _ _ _ _ _ _ _ _ _ _ _ _ _ _.

The force of attraction between different kinds of particles is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ force.

The space occupied by matter is called its _ _ _ _ _ _ _ _ _ _ _ _ _ _.

When we burn a paper, it changes into _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Solids generally exert pressure only at their _ _ _ _ _ _ _ _ _ _ _ _ _ _.

The process during which a liquid changes into its solid state at a fixed temperature (on cooling) is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ or solidification.

In solids, the intermolecular space is _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Liquids exert pressure in _ _ _ _ _ _ _ _ _ _ _ _ _ _ directions.

Dry ice is an example of a _ _ _ _ _ _ _ _ _ _ _ _ _ _ substance.

The process during which a gas changes into its liquid state at a fixed temperature on cooling is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Gases exert pressure on the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of the container.

Anything that has mass and occupies space is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Besides solids, liquids and gases, other states of matter include plasma, Bose-Einstein Condensate, and _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Atoms and molecules are very small; they cannot be seen even by an _ _ _ _ _ _ _ _ _ _ _ _ _ _ microscope.

Substances that can flow easily are called _ _ _ _ _ _ _ _ _ _ _ _ _ _.

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