Particle Movement: Expansion and Contraction in Solids, Liquids, and Gases

The video explains the concepts of expansion and contraction at a particle level in solids, liquids, and gases. When heat is added, particles gain kinetic energy, move apart, and cause expansion. Conversely, removing heat slows particles, bringing them closer and causing contraction. The video provides examples in solids, liquids, and gases, such as metal balls, thermometers, and balloons, to illustrate these concepts. It emphasizes that particle size remains unchanged and that these are physical, not chemical, changes.

What happens to particles when heat is added to them?

• They decrease in size.

• They change into a different substance.

• Their kinetic energy increases.

• They move closer together.

Which of the following is true about the size of particles during expansion?

• The size of particles increases.

• The size of particles decreases.

• The size of particles changes randomly.

• The size of particles remains the same.

What type of change is expansion considered to be?

• Biological change

• Nuclear change

• Physical change

• Chemical change

In the metal ball and ring experiment, why does the ball no longer fit through the ring after heating?

• The ball's material changes.

• The ball's particles expand, taking up more space.

• The ring shrinks.

• The ball becomes softer.

Why are sidewalks constructed in separate blocks?

• To make them easier to clean.

• To allow for expansion and contraction.

• To improve aesthetics.

• To save materials.

How does a thermometer demonstrate liquid expansion?

• The liquid solidifies.

• The liquid evaporates.

• The liquid changes color.

• The liquid rises as it expands.

What happens to the water in a thin glass tube when heat is added?

• It evaporates.

• It contracts.

• It changes color.

• It rises as it expands.

What is observed when a balloon is placed in the freezer?

• The balloon changes color.

• The balloon contracts.

• The balloon expands.

• The balloon bursts.

What happens to the balloon when it returns to room temperature after being in the freezer?

• It remains contracted.

• It inflates back to its original size.

• It changes color.

• It bursts.

What is the main takeaway from the video regarding particle behavior during expansion and contraction?

• Particles become more colorful.

• Particles change into new substances.

• Particles change size.

• Particles move closer or further apart without changing size.