Three Phases of Matter
The three most common phases of matter are solid, liquid, and ___.
What is gas?
Particles in all matter are always ___.
Most materials ___ when heated.
What is expand
A thermos is designed to keep drinks hot or cold using ___.
Insulation
A solution is made when something dissolves in something else. The thing that dissolves is the
What is solute
In a solid, particles are packed ___ and only vibrate in place.
What is tightly (or closely)?
This tool measures the average kinetic energy of particles.
Thermometer
Most materials ___ when cooled.
What is contract
This kind of energy transfer happens when particles bump into each other.
Conduction
The substance doing the dissolving is called the ___.
Solvent
When a substance changes from liquid to gas, it’s called ___.
What is evaporation (or boiling)?
The faster particles move, the more ___ they have.
What is energy (or thermal energy)?
Bridges have expansion joints to prevent damage from this.
Thermal expansion
Air is a good insulator because it is a ___.
When salt dissolves in water, it forms this.
What is a solution
This process turns a gas directly into a solid.
What is deposition
In gases, particles are ___ and move freely.
What is, spread out
When particles gain energy, they move ___ and spread out.
What is faster
Name one way engineers reduce heat transfer in a thermos.
Use of vacuum layers, reflective surfaces, or foam insulation.
Stirring and heating a liquid helps something dissolve by ___.
Moving particles faster
Name a condition that affects whether a material is solid, liquid, or gas.
What is temperature or pressure
Why do gases expand to fill a container?
Particles move fast and in all directions
Explain how temperature affects the volume of a gas in a closed container.
Higher temperature makes gases expand
Why might metal feel colder than wood, even at the same temperature?
Metal conducts heat away faster
Why can’t all substances dissolve in water?
Not chemically compatible with water