1. Types of Phase Change
This phase change happens when a solid turns into a liquid.
Answer: What is melting?
In this phase, molecules vibrate in place and stay tightly packed.
Answer: What is a solid?
Ice cube becoming water.
Answer: What is melting?
When a substance melts, is energy added or removed?
Answer: What is added?
Explain what happens to molecules when a solid becomes a liquid.
Answer: Molecules move more and are able to slide past each other but stay close together.
This phase change happens when a liquid turns into a gas.
Answer: What is evaporation?
In this phase, molecules move around each other but stay close together.
Answer: What is a liquid?
Mirror fogging up after a shower.
Answer: What is condensation?
When a substance freezes, is energy added or removed?
Answer: What is removed?
Explain what happens to molecules when a liquid becomes a gas.
Answer: Molecules move much faster and spread far apart.
This phase change happens when a gas turns into a liquid.
Answer: What is condensation?
In this phase, molecules move freely and spread far apart.
Answer: What is a gas?
A puddle disappearing on a sunny day.
Answer: What is evaporation?
During evaporation, molecules gain or lose energy?
Answer: What is gain?
Why does condensation form on the outside of a cold cup?
Answer: Water vapor in the air loses energy and turns into liquid on the cold surface.
This phase change happens when a liquid turns into a solid.
Answer: What is freezing?
When energy is added, molecules move faster or slower?
Answer: What is faster?
Water turning into ice in a freezer.
Answer: What is freezing?
During condensation, molecules gain or lose energy?
Answer: What is lose?
Answer: What is lose?
Why does a puddle dry up faster on a hot day?
Answer: More energy causes molecules to move faster and evaporate more quickly.
This phase change happens when a solid turns directly into a gas.
Answer: What is sublimation?
When a liquid _________, molecules move less
Answer: What is freezes?
A cold soda can is taken outside on a hot day and water droplets form on the outside of the can. What phase change is happening and why?
Answer:
What is condensation? Water vapor in the air loses energy when it touches the cold can and changes from a gas to a liquid.
Does temperature always increase during a phase change?
Answer: What is no?
How does molecular motion connect to what we see at the macro scale?
Answer: Changes in molecular motion and spacing cause the visible changes between solid, liquid, and gas.