States of Matter
What is a solid?
A solid has a definite shape and volume, with closely packed molecules
What happens during melting?
During melting, a solid changes into a liquid as it gains heat energy and its molecules move more freely.
What does conservation of matter mean?
Conservation of matter means that matter cannot be created or destroyed; it only changes forms.
How do molecules behave in a solid?
In a solid, molecules are tightly packed and vibrate in place, maintaining a fixed shape and volume.
What is a liquid?
A liquid has a definite volume but takes the shape of its container, with molecules that are close together but can move around.
What happens during freezing?
During freezing, a liquid turns into a solid as it loses heat energy and its molecules become more ordered.
Give an example of conservation of matter.
Answers vary
What happens to molecules when a liquid is heated?
When a liquid is heated, its molecules gain energy, move faster, and may eventually evaporate into gas.
What is a gas?
A gas has no definite shape or volume, with molecules that are far apart and move freely.
What is evaporation?
Evaporation is the process where liquid turns into gas when it gains enough energy.
How does matter change during evaporation?
Molecules warm and change from a liquid to a gas - they become free to move around
How do gas molecules move?
Gas molecules move quickly and freely, spreading out to fill the container they are in.
What is plasma?
Plasma is a state of matter where gas is energized until atomic electrons are no longer associated with their parent nuclei.
What is condensation?
Condensation is the process where gas turns into liquid as it loses energy and cools down.
Explain what happens when it looks like matter is disappearing
The matter is really just changing form
What happens to molecules in freezing temperatures?
In freezing temperatures, molecules lose energy, slow down, and become more ordered, forming a solid.