Front

Change of state from solid to liquid?

Back

melting

Answer explanation

The change of state from a solid to a liquid is called melting. This process occurs when a solid absorbs heat and its particles gain enough energy to overcome their rigid structure, transitioning into a liquid state.

Front

Change from gas to solid?

Back

reverse sublimation

Answer explanation

The change from a gas directly to a solid is called reverse sublimation. This process is the opposite of sublimation, where a solid turns into a gas. The other options do not describe this specific transition.

Front

Gases can be compressed because their particles are very far apart.

Back

The particles in a gas are very far apart.

Answer explanation

The correct choice is that the particles in a gas are very far apart. This spacing allows gases to be compressed, as there is more empty space between particles compared to solids or liquids, which have fixed volumes.

Front

A liquid cannot be compressed because:

Back

The particles in a liquid are all close and touching.

Answer explanation

The correct statement is that the particles in a liquid are all close and touching. This close arrangement prevents compression, as there is little space between particles, unlike gases where particles are far apart.

Front

Boiling points of liquids: A: 20°C, B: 30°C, C: 40°C, D: 50°C. Weakest bonds?

Back

Liquid A: 20°C

Answer explanation

Liquid A has the lowest boiling point at 20°C, indicating it has the weakest bonds between its particles. Lower boiling points suggest that less energy is needed to overcome the intermolecular forces.

Front

Correct statement about liquids:

Back

No fixed shape, fixed volume.

Answer explanation

Liquids do not have a fixed shape; they take the shape of their container. However, they do have a fixed volume, meaning the amount of liquid remains constant regardless of the container's shape.

Front

States of matter: X, Y, Z. Change during condensation?

Back

Y to X

Answer explanation

During condensation, a gas (represented by Y) changes into a liquid (represented by X). Therefore, the correct change is Y to X.

Front

Graph shows temperature changes when a substance cools. Describe X and Y.

Back

X is condensing and Y is freezing.

Answer explanation

X represents the condensing phase where a gas turns into a liquid, and Y represents the freezing phase where a liquid turns into a solid. Thus, the correct choice is that X is condensing and Y is freezing.

Front

Ice cube warmed. Process?

Back

Melting

Answer explanation

The ice cube is being warmed, which causes it to change from solid to liquid. This process is called melting, as the ice absorbs heat and transitions to water.

Front

Particles in a gas:

Back

Random motion.

Answer explanation

The correct statement is that the particles in a gas are in random motion. This means they move freely and collide with each other and the walls of their container, unlike ordered arrangements found in solids.