7.8B & C: Thermal Equilibrium and Particle Theory

Front

What is thermal equilibrium?

Back

Thermal equilibrium is the state in which two objects in contact with each other do not exchange heat, meaning they are at the same temperature.

Front

What is particle theory?

Back

Particle theory states that all matter is made up of tiny particles that are in constant motion, and the properties of matter depend on the arrangement and movement of these particles.

Front

How do particles behave in a solid?

Back

In a solid, particles are closely packed together and vibrate in place, maintaining a fixed shape and volume.

Front

How do particles behave in a liquid?

Back

In a liquid, particles are close together but can move past one another, allowing liquids to take the shape of their container while maintaining a fixed volume.

Front

How do particles behave in a gas?

Back

In a gas, particles are far apart and move freely, filling the entire volume of their container and having no fixed shape or volume.

Front

What happens to gas particles when temperature decreases?

Back

When temperature decreases, gas particles move more slowly and come closer together, which can lead to condensation.

Front

What is density?

Back

Density is the mass of a substance divided by its volume, often expressed in grams per cubic centimeter (g/cm³).

Front

Which liquid has the greatest density: lamp oil, karo syrup, water, or honey?

Back

Honey has the greatest density among these liquids.

Front

What is the direction of heat transfer?

Back

Heat always travels from hot to cold objects.

Front

What happens to the volume of a gas when it is heated?

Back

When a gas is heated, its particles move faster and spread apart, causing the volume of the gas to increase.