States of Matter
Changes of State
Changes of State 2
Physical vs. Chemical Changes
Physical vs. Chemical Changes/Essay Questions
100
A ______________ is a state of matter that has a constant volume and a constant shape.
solid
100
The change from a liquid to a solid, or the reverse of melting, is called _____.
freezing
100
When the particles in a gas lose enough thermal energy to form a liquid, ________ occurs.
condensation
100

Explain the difference between solute and solvent

Solute- what's mixed into the solution

Solvent- what it's mixed into.

100

Name a physical change that could occur to a t-shirt

Various answers. Mrs. Peace gets to decide! ripping it, balling it up, wrinkling it, etc.

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
For water to change from one state to another, ________ must be added or taken away
energy
200
A type of change where the substance stays the same, but size and shape may change.
Physical Change
200
Describe the difference between a physical and a chemical change.
A physical change does not create a new substance, a chemical change creates a new substance.
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
As a substance changes from a liquid to a gas, the distance between its particles________
increases
300
Is digesting food considered a physical or chemical change?
Chemical
300
State why rusting is considered a chemical change.
Because a new substance (rust) is formed. New substances always mean chemical changes.
400

Name the formula for density and what it is. 

Measure of how compact something is.
Density = mass divided by volume. 

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
Name two pieces of evidence that a chemical change occurred
Change in odor, change in color, precipitate forms, new substance forms, change in temperature, etc.
400
Compare solids, liquids, and gases in terms of their shapes and volumes.
Solid - definite shape and definite volume. Liquid - definite volume, no definite shape (takes shape of container). Gas - no definite shape, no definite volume.
500
The resistance of a liquid to flowing is called ________.
viscosity
500
_______ occurs when a liquid changes to a gas below the surface as well as at the surface.
Boiling
500
To change states of matter, a change in _________ is needed
energy
500
Describe a physical change that might occur to water
Change of state, change of color, mixing anything in, etc.
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.
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