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34 terms

SVMSscience - Chem Unit 1

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Solid
Has a definite shape and definite volume, particles in a fixed position
Liquid
Has an indefinite shape and definite volume, particles slide past one another
Gas
Has an indefinite shape and an indefinite volume, particles spread apart
3 States of Matter
Solid, Liquid, and Gas
Mixtures
Two or more substances that are mixed together, but not chemically combined
Solutions
Best Mixture
Pure Substance
Only one kind of matter
Atom
The smallest particle of an element with the properties of that element
Element
A substance in which all atoms are alike, which cannot be chemically or physically separated
Compounds
Made of two or more elements that are chemically combined
Chemical Bond
The force that holds atoms together
Physical Change
A change that alters the form or appearance of a substance, but does not make the materials in to another substance
Chemical Change
A change that creates a new substance
Melting
Change from solid to liquid, heat/energy added
Boiling
Vaporization that occurs on and below the surface of a liquid, heat/energy added
Vaporization
Liquid to gas, heat/energy added
Sublimation
Change from Solid to Gas, heat/energy added
Freezing
Change from liquid to solid, heat/energy taken away
Condensation
Change from gas to liquid, heat/energy taken away
Characteristic Properties
A quality of a substance that never changes and can be used to identify the substance
Chemical Formula
A combination of symbols that represent the elements in a compound
5 Signs of a Chemical Reaction
Change of color, change in temperature, precipitation, production of gas, change in properties (odor, light)
Crystalline Solid
A substance made of crystals in which the particles are arranged in regular repeating patterns
Amorphous Solid
A solid made up of particles that are not arranged in a regular pattern
Viscosity
The resistance of a liquid to flowing
Temperature
The measure of the average energy of the motion of particles in a substance
Pressure
Force exerted on a surface, divided by the total area over which the force is exerted.
Evaporation
Vaporization that occurs at the surface of a liquid
Molecule
Particle consisting of two or more atoms
Atoms
Building blocks of all matter, smallest particle of an element that still retains properties of that element
Parts of an Atom
Protons, Neutrons, Electrons
Protons
Particles with a positive charge
Neutrons
Particles with no charge
Electrons
Particles with a negative charge