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SOM
Changes of State
Changes of State 2
Misc.
Gas Laws Stuff part II
100

A ______________ is a state of matter that has a definite volume and a definite shape.

solid

100
The change from a liquid to a solid, or the reverse of melting, is called _____.
freezing or solidification
100
When the particles in a gas lose enough thermal energy to form a liquid, ________ occurs.
condensation
100

________ effects the energy of motion of particles in a substance.

Temperature

100

In our dry ice lab, what was the solid dry ice sublimating into?

 Carbon dioxide 

200
The state of matter in which the particles spread apart and fill the space available is called a ________, which does not have a definite shape or volume.
gas
200
The change of state when the particles of a solid gain enough thermal energy to break free and become a liquid is called _______.
melting
200
During the process of _______, a solid turns directly into a gas, like dry ice.
sublimation
200

A ____________ is made up of more than one type of atom joined together

Molecule / Compound

200

Explain why more time is required to boil pasta on the Himalaya's then in Woodbury, MN?

What is the boiling point of liquids decrease as atmospheric pressure decreases. At higher elevations, atmospheric pressure is reduced, so boiling point of water is lower than in MN. This means...pasta boiled in the Himalaya's will cook at a lower temperature and take longer to cook. (BRRRR)

300

In a ____________, the particles are packed somewhat closely but move around each other freely and take the shape of its container.

liquid

300
_________ is the process by which particles of a liquid gain enough thermal energy to become a gas.
Vaporization
300
The temperature of a substance increases when the __________ energy of the substance increases.
thermal
300

The amount of space that a gas takes up is its ________.

volume

300

When you decrease the volume of a container, what is happening to the pressure

  Pressure is increasing 

400

A ________ is a substance that flows.

fluid

400
Vaporization that takes place only at the surface of a liquid is called ________.
evaporation
400
Explain what happens to a puddle from a rainstorm on a sunny day.
Evaporation takes place. The sun heats up the puddle and the particles of the liquid gain enough thermal energy to become a gas on the surface. This continues to happen until the puddle dries up completely.
400

The change from a solid state directly into a gas is called __________________ 

Sublimation

400

When heat leaves or exits to make a change. What is this called

Exothermic reaction

500

At which phase are the particles free to move around each other?

Liquid and Gas

500
_______ occurs when a liquid changes to a gas below the surface as well as at the surface.
Boiling
500
In all changes of state, a change in _______________ is also needed.
thermal energy
500

If you buy inflated party balloons that are at room temperature, what will happen to them if you take them outside on a cold day? Explain.

The volume of the balloons will decrease. When the temperature of a gas decreases at constant pressure, the volume of the gas will also decrease.

500

Explain how the motions of particles differs in gases, liquids, and solids.

Solids - particles are tightly packed, slightly vibrating. Liquids - particles are closely packed but freely moving around each other. Gases - particles move freely and in all directions, filling the entire space of the container.