Phase Change and Molecular Behavior Quiz

Analyze the molecular behavior of ice as it melts into water. How do the molecular arrangements and movements change during this phase transition?

• Molecules move closer together and vibrate less.

• Molecules move further apart and begin to slide past each other.

• Molecules remain in a fixed position but vibrate more.

• Molecules form a rigid lattice structure.

Evaluate the impact of pressure on the phase change of water from liquid to gas. How does increasing pressure affect the boiling point of water?

• Increasing pressure decreases the boiling point of water.

• Increasing pressure has no effect on the boiling point of water.

• Increasing pressure increases the boiling point of water.

• Increasing pressure causes water to freeze instead of boil.

Propose a hypothesis about how the phase change from gas to liquid affects the energy of the molecules involved. Design an investigation to test your hypothesis.

• Hypothesis: Molecules gain energy during condensation. Investigation: Measure temperature changes as steam condenses.

• Hypothesis: Molecules lose energy during condensation. Investigation: Measure temperature changes as steam condenses.

• Hypothesis: Molecules maintain the same energy during condensation. Investigation: Observe steam without measuring temperature.

• Hypothesis: Molecules gain energy during condensation. Investigation: Observe steam without measuring temperature.

Design an experiment to investigate how the appearance of water changes as it transitions from a liquid to a gas. Consider the equipment you would use, the steps you would take, and how you would record your observations.

• Use a thermometer and a stopwatch to measure the time it takes for water to boil.

• Set up a beaker of water on a hot plate, use a thermometer to measure temperature changes, and record observations of steam formation at different temperatures.

• Measure the volume of water before and after boiling to determine the amount of water lost.

• Use a microscope to observe the molecular structure of water as it boils.

Create a model to demonstrate the changes in molecular motion and arrangement when a substance transitions from a solid to a liquid. Describe the key features of your model.

• A diagram showing molecules in a fixed position for both solid and liquid states.

• A 3D model with tightly packed molecules for the solid state and loosely packed molecules for the liquid state.

• A chart comparing the temperatures of different substances as they melt.

• A video showing the melting process of ice.