Phase Change Quiz

Which phase change involves a solid turning directly into a gas?

• Melting

• Freezing

• Sublimation

• Condensation

Answer explanation

Sublimation is the phase change where a solid transitions directly into a gas without becoming a liquid first. This distinguishes it from melting, freezing, and condensation, making it the correct answer.

Match each process with the correct change of state:

• Gas turns directly into solid

• Ionization

• Neutral atoms become charged particles

• Evaporation

• Liquid turns into gas

• Deposition

• Gas turns into liquid

• Condensation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

(a)   best illustrates the process of deposition.

• Ice melting into water

• Water turning into steam

• Frost forming from water vapor

• Dry ice changing into gas

Answer explanation

Frost forming from water vapor best illustrates deposition, as it involves water vapor transitioning directly into solid ice without becoming liquid first, demonstrating the process of deposition.

Tags

NGSS.MS-PS1-4

What phase change occurs when plasma cools and forms neutral gas atoms?

• Ionization

• Recombination

• Evaporation

• Freezing

Answer explanation

When plasma cools, electrons recombine with ions to form neutral gas atoms. This process is known as recombination, distinguishing it from other phase changes like ionization, evaporation, or freezing.

Tags

NGSS.MS-PS1-4

The phase change demonstrated by steam condensing into water droplets is called (a)   .

• Freezing

• Melting

• Condensation

• Sublimation

Answer explanation

The phase change of steam condensing into water droplets is called condensation. This process occurs when water vapor loses energy and transitions from a gas to a liquid state.

Tags

NGSS.MS-PS1-4

Which phase of matter is characterized by having a definite shape and volume, with particles closely packed in a fixed arrangement?

• Liquid

• Gas

• Solid

• Plasma

Answer explanation

The solid phase of matter is defined by having a definite shape and volume, with particles that are closely packed in a fixed arrangement, unlike liquids, gases, and plasma which have more fluidity and less defined shapes.

In which phase of matter do particles have neither a definite shape nor volume, and are far apart and move freely?

• Solid

• Liquid

• Gas

• Plasma

Answer explanation

In the gas phase, particles are far apart, move freely, and do not have a definite shape or volume. This distinguishes gases from solids and liquids, which have more structured arrangements.

Tags

NGSS.MS-PS1-4

What is the term for the movement of molecules within a substance, which varies by phase and temperature?

• Particle Arrangement

• Molecular Motion

• Density

• Pressure

Answer explanation

The term 'Molecular Motion' refers to the movement of molecules within a substance, which changes with different phases (solid, liquid, gas) and temperatures. This distinguishes it from other concepts like density or pressure.

Tags

NGSS.MS-PS1-4

The force exerted by particles in a gas against the walls of its container, affecting gas behavior and volume, is called (a)   .

• Density

• Pressure

• Volume

• Temperature

Answer explanation

The force exerted by gas particles against container walls is known as pressure. It directly influences gas behavior and volume, making 'Pressure' the correct answer.

What is the primary focus of an investigation in scientific studies?

• Memorizing facts

• Exploring scientific questions through experiments and observations

• Calculating mathematical equations

• Reading scientific literature

Answer explanation

The primary focus of scientific investigations is to explore scientific questions through experiments and observations, allowing researchers to gather data and draw conclusions, rather than just memorizing facts or reading literature.

Tags

NGSS.MS-LS1-1