State Expectations
This state of matter has a definite shape and definite volume.
What is a solid?
This phase change turns a solid into a liquid.
What is melting?
Tearing paper is this type of change.
What is a physical change?
Density is this kind of property.
What is a physical property?
In this state, particles are tightly packed and mostly vibrate in place.
What is a solid?
This state has a definite volume but takes the shape of its container.
What is a liquid?
This phase change turns a gas into a liquid.
What is condensation?
Rusting iron is this type of change.
What is a chemical change?
Flammability is this kind of property.
What is a chemical property?
When matter is heated, its particles generally do this.
They move faster.
This state has neither a definite shape nor a definite volume.
What is a gas?
Dry ice changing directly from solid to gas is called this.
What is sublimation?
Melting candle wax is this type of change.
What is a physical change?
This is the temperature at which a solid becomes a liquid.
What is melting point?
Gas particles can be compressed easily because of this feature of their arrangement.
There is lots of empty space between gas particles
This state of matter consists of charged particles and is found in stars and lightning.
What is plasma?
Frost forming directly from water vapor is this phase change.
What is deposition?
A cloudy solid (a precipitate) suddenly forming when two liquids are mixed is evidence of this kind of change.
What is a chemical change / chemical reaction?
This term means the ability of a substance to react with another substance.
What is reactivity?
A sealed syringe contains air. When the plunger is pushed down, the gas takes up less space. This is possible because of this feature of gas particles.
What is the large amount of empty space between gas particles?
This is why a gas fills its entire container while a liquid does not.
What is gas particles move freely and spread throughout the available space; liquid particles remain close together even though they can flow.
Water droplets form on the outside of a cold glass on a humid day. Identify the phase change and explain where the water came from.
What is condensation? Water vapor in the air cooled and changed into liquid water.
Water boiling looks dramatic, but it is still this type of change. Explain why.
A physical change, because the substance is still H₂O; only its state changes.
Give one physical property and one chemical property of a substance.
density + flammability, color + ability to rust, boiling point + reactivity with acid, etc.
According to the particle model, explain what happens to particle motion and spacing as a substance changes from liquid to gas.
Overcoming attractions between particles / changing particle arrangement rather than raising temperature.