Exploring States of Matter

What is the arrangement of particles in a solid?

• Particles are far apart and move freely.

• Particles are closely packed in a fixed position.

• Particles are loosely packed and can slide past each other.

• Particles are ionized and move freely.

Answer explanation

In a solid, particles are closely packed in a fixed position, which means they vibrate but do not move freely. This arrangement gives solids their definite shape and volume, distinguishing them from liquids and gases.

Which state of matter has a definite shape and volume?

• Liquid

• Gas

• Solid

• Plasma

Answer explanation

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

How do particles in a gas move?

• They vibrate in place.

• They slide past each other.

• They move freely and quickly in all directions.

• They are fixed in a rigid structure.

Answer explanation

In a gas, particles move freely and quickly in all directions, allowing them to fill the available space. This is different from solids, where particles vibrate in place, or liquids, where they slide past each other.

Tags

NGSS.MS-PS1-4

What happens to the particles of a liquid when it is heated?

• They move slower and come closer together.

• They move faster and spread apart.

• They stop moving.

• They become fixed in place.

Answer explanation

When a liquid is heated, its particles gain energy, causing them to move faster and spread apart. This increased movement and distance between particles is why the correct answer is that they move faster and spread apart.

Tags

NGSS.MS-PS1-4

Which state of matter can be easily compressed?

• Solid

• Liquid

• Gas

• Plasma

Answer explanation

Gases can be easily compressed because their particles are far apart and have more space to move into when pressure is applied. In contrast, solids and liquids have closely packed particles, making them much less compressible.

What is an example of a substance in the plasma state?

• Ice

• Water vapor

• Lightning

• Wood

Answer explanation

Lightning is an example of plasma, which is a state of matter consisting of ionized gas with free electrons. Ice and wood are solids, while water vapor is a gas, making lightning the correct choice for a plasma state substance.

Tags

NGSS.MS-PS1-4

What change of state occurs when a solid turns into a liquid?

• Freezing

• Condensation

• Melting

• Sublimation

Answer explanation

The change of state when a solid turns into a liquid is called melting. During melting, the solid absorbs heat, causing its particles to move more freely and transition into the liquid state.

Tags

NGSS.MS-PS1-4

Which of the following is true about the volume of a gas?

• It has a definite volume.

• It takes the shape and volume of its container.

• It has a definite shape but no definite volume.

• It has a definite volume but no definite shape.

Answer explanation

The correct choice is that a gas takes the shape and volume of its container. Unlike solids and liquids, gases do not have a definite volume or shape, allowing them to expand and fill the available space.

What is the process called when a gas changes directly into a solid?

• Sublimation

• Deposition

• Evaporation

• Condensation

Answer explanation

The process when a gas changes directly into a solid is called deposition. This occurs without passing through the liquid phase, unlike sublimation, which is the reverse process.

How does increasing pressure affect the state of matter?

• It can turn a gas into a liquid.

• It can turn a solid into a gas.

• It has no effect on the state of matter.

• It can turn a liquid into a gas.

Answer explanation

Increasing pressure can compress gas molecules, leading to condensation and turning a gas into a liquid. This process is known as liquefaction, making the first answer choice correct.