States of Matter and Changes Quiz - Science 8

What is the term used to describe the ability of a substance to flow?

• Solidification

• Fluidity

• Condensation

• Sublimation

Answer explanation

The term 'fluidity' refers to the ability of a substance to flow. It is a key characteristic of liquids and gases, distinguishing them from solids, which do not flow. Therefore, 'fluidity' is the correct answer.

Which state of matter has a definite shape and definite volume?

• Liquid

• Gas

• Solid

• Plasma

Answer explanation

A solid has a definite shape and definite volume, unlike liquids, which take the shape of their container, and gases, which have neither a definite shape nor volume. Therefore, the correct answer is solid.

What is the process called when a gas changes into a liquid?

• Melting

• Vaporization

• Condensation

• Sublimation

Answer explanation

The process when a gas changes into a liquid is called condensation. This occurs when gas molecules lose energy and come together to form a liquid, contrasting with vaporization, which is the transition from liquid to gas.

Which state of matter has a definite volume but no definite shape?

• Solid

• Liquid

• Gas

• Plasma

Answer explanation

A liquid has a definite volume, meaning it occupies a specific amount of space, but it does not have a definite shape, as it takes the shape of its container. This distinguishes it from solids, which have both definite volume and shape.

What is the process of changing from a solid directly to a gas called?

• Freezing

• Melting

• Sublimation

• Condensation

Answer explanation

The process of changing from a solid directly to a gas is called sublimation. This occurs without passing through the liquid phase, as seen in substances like dry ice (solid carbon dioxide) that turn into gas when heated.

What is the term for any substance that flows, including liquids and gases?

• Solid

• Fluid

• Plasma

• Crystal

Answer explanation

The term 'fluid' refers to any substance that can flow, which includes both liquids and gases. Unlike solids, which maintain a fixed shape, fluids adapt to the shape of their container.

What is the process of changing from liquid to solid known as?

• Melting

• Vaporization

• Freezing

• Sublimation

Answer explanation

The process of changing from liquid to solid is known as freezing. During freezing, a liquid loses energy and its molecules become more ordered, forming a solid structure.

Which state of matter has neither a definite shape nor a definite volume?

• Solid

• Liquid

• Gas

• Plasma

Answer explanation

A gas has neither a definite shape nor a definite volume. It expands to fill its container, unlike solids and liquids, which have fixed shapes and volumes.

What is the process of changing from liquid to gas also known as?

• Freezing

• Condensation

• Vaporization

• Melting

Answer explanation

The process of changing from liquid to gas is called vaporization. This occurs when a liquid absorbs enough energy to overcome intermolecular forces, allowing it to transition into the gaseous state.

What is the transformation of a substance’s physical state into another state called?

• Change of State

• Fluidity

• Solidification

• Evaporation

Answer explanation

The transformation of a substance's physical state into another state is called a 'Change of State'. This term encompasses processes like melting, freezing, evaporation, and condensation.