States of Matter

Oct.18, 2005

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atom
the basic building blocks of matter. Atoms cannot be chemically subdivided.
 

Bunsen Burnerboiling point
the temperature at which a liquid becomes a gas. This happens when energy is added and liquid is heated.
chemical property
one property that defines matter. An example of chemical properties is the way elements combine with each other such as the formation of rust (iron oxide), which is produced when oxygen in the air reacts with iron.
 
compress
to press or squeeze together
 
condensation

the phase change that occurs when vapor, or gas, cools and changes to liquid . Condense is the opposite of evaporate.
Condensation
 

condensation point
     
 
Dew on a Stemthe temperature at which a gas becomes a liquid. This happens when energy is removed and gas is cooled.
 
density
a physical property. Density is the mass of a substance per unit volume. Density
 
element substances that cannot be separated into simpler substances.
 
energy
basic property defined as the capacity to do work. Energy in the form of heat is needed to change from one phase to another. The basic forms of energy includeelectrical, chemical, mechanical, nuclear and radiant (light).
 
evaporation

the phase change that occurs when a liquid's atoms or molecules gain enough energy to change to a gas. Heat makes water evaporate faster. Evaporation
 

Thermometerfreezing point
 
the temperature at which a liquid becomes a solid. This happens when energy is removed and a liquid is cooled.
 
gas
one state, or phase, of matter. A gas is easy to compress, spreads out evenly to fill out a container of any size and shape, and it's atoms have more energy than liquids or solids.
 
liquid
one state, or phase, of matter that exists between the solid phase and gas phase. A liquid is hard to compress, takes the shape of the part of the container it is in, and its atoms have more energy than a solid but less than a gas.
 
mass
is how much there is of an object.
 
matter
anything that takes up space and has mass. Matter can change in two major ways, physically and chemically.
 
melting point
the temperature at which a solid becomes a liquid. This happens when a solid is heated and energy is added.
 
Molecule Modelmolecule
the smallest part of a substance formed by the chemical bonding of two or more atoms and that still retains its chemical composition and properties.
phase
a physical condition or stage of matter. Another word for phase is "state".
 
physical properties

the part of an object that can be experienced using one of the five human senses: sight, sound, touch, taste or smell or, detected through any measuring tool.
Some physical properties are: color, shape, mass, density, and volume.
 

plasma
considered a 4th "state of matter. Plasma is a lot like gas but is made up of free electrons and ions. Electricity (a form of energy) flowing through the gas in a neon sign, or a fluorescent light make plasma in those lights.
 
pressure is the measure of force that acts on a unit area
 
property
describes how an object looks, feels, or acts
 
solid
one state, or phase, of matter that is hard to compress, holds a shape, has a certain size, and might be hard. Atoms in solids don't move very much.
 
state

a physical condition or stage of matter. Another word for state is "phase." State
 

vaporSteam over Boiling Water
another word for gas. Vapor is the word used to describe gases that are usually found as liquids, such as water.
 
volume
the amount of space an object occupies. Volume
 
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