45 terms

Unit 2 Test Review

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Solid
has a shape and takes up a certain amount of space
Liquid
does not have a shape but takes up a certain amount of space
Gas
does not have a shape and does not take up a certain amount of space;
Condensation
process in which matter changes from a gaseous state (vapor) to a liquid state
Evaporation
change of matter from a liquid state to a gaseous state (vapor)
Freezing
Process in which matter changes from a liquid to a solid state; also known as solidification
Melting Point
temperature at which a substance changes from a solid state to a liquid state; same as freezing point for that substance
Gas
A state of matter in which particles have a very high energy and they move quickly.
Gas
Does not have a definite volume or shape.
Gas
A state of matter where the particles expand to fill and take shape of whatever container they are in.
Liquid
Particles are free to move around one another but still touch.
Liquid
A state of matter with a definite volume, but no definite shape.
Solid
The particles vibrate slightly and are in a close packed arrangement.
Solid
Has a definite shape and definite volume.
Solid
A state of matter are particles are packed tightly together in fixed positions.
What is the boiling point of water at sea level?
100 °C (212 °F)
What is the freezing point of water?
0 °C (32 °F)
Physical Properties
Traits of an object that can readily be seen
Density
A physical property; the relationship between the mass of a material and its volume
Physical Properties of Matter Examples
Melting Point; Boiling Point; Density; Clarity, Conductivity, Ductile, Texture, Malleable
Conductivity
Ability to conduct heat or electricity
Texture
how the surface of a substance feels
Clarity
translucent, transparent, opaque
Evaporation
A separation technique that involves changing a substance from a liquid to a gas e. g. to get pure water from a salt solution.
Filtration
Used when separating a solid substance from a fluid (a liquid or a gas) by passing a mixture through a material that traps the insoluble solid and allows the liquid or gas to pass thru microscopic wholes.
Chromatography
Is used to separate different colored substances that make up ink or dye.
Magnetism
Using a magnet to separate objects with magnetic properties like iron, nickle, and cobalt. Ex: separate iron from sand, recycling, cow magnets
Sifting
Used to separate a dry mixture which contains substances of different sizes by passing it through a sieve, a device containing tiny holes. Ex: Sand and Shells
Floatation
Separation by different densities; some substances float or sink allowing the floaters to be skimmed off the top. Ex: waste treatment or oil spills
Mixture
two or more materials stirred together; can change size and shape but no chemical changes
Solution
a special mixture formed when a material dissolves into a solvent
Solute
The material that gets dissolves in a solution (i.e. Sugar, Salt, Epsom Salt, Citric Acid).
Solvent
The part of a solution that does the dissolving (usually water)
Dissolve
When a material seems to disappear.
Concentrated
a solution containing a lot of solute
Diluted
a solution containing little solute
Increase Temperature, Stir, and Smaller Particle Sizes
What are the three ways to increase the rate of dissolving?
Universal Solvent
Water
Is a solution a mixture?
YES! All solutions are mixtures because it is two or more substances mixed together.
NaCl
What is salt?
concentrated solution
refers to the amount of material (solute) dissolved in a measure (volume) of a liquid (solvent)
concentrated
a solution containing a lot of solute
Diluted
made thinner or weaker by adding water
Saturated Solution
a solution that cannot dissolve any more solute under the given conditions
Is a solution a mixture?
YES! All solutions are mixtures because it is two or more substances mixed together.
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