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Flashcards for vocab from the fourth Chapter
50
Science
8th Grade
09/21/2011

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Term
Element
Definition
A pure substance that cannot be broken down into a simpler substance by physical or chemical means
Term
Pure Substance
Definition
A substance in which there is only on type of particle
Term
Metals
Definition
Shiny, conduct heat and electric current. Also they are malleable and ductile
Term
nonmetals
Definition
Do not conduct electricity or heat, and are dull. are not malleable or ductile
Term
Metalloids
Definition
Contain characteristics of metals and non-metals
Term
Compound
Definition
is composed of two or more elements that are chemically combined
Term
Sodium
Definition
Soft, silvery white material that violently reacts with water
Term
Chlorine
Definition
A greenish yellow poisonous gas
Term
Sodium Chloride
Definition
Table salt that includes Chlorine and sodium it is a White solid, It is edible and it dissolves in water
Term
Mixture
Definition
A combo of two or more substances that are not chemically combined
Term
Distillation
Definition
Is a process that separates a mixture based on the boiling points of the components.
Term
Centrifuge
Definition
Separates the mixtures by the densities of the components
Term
solution
Definition
A mixture that appears to be a single substance
Term
Soulte
Definition
The substance that is dissolved
Term
Solvent
Definition
The substance in which the substance is dissolved
Term
Concentration
Definition
Measure of the amount of solute dissolved in the solvent
Term
Solubility
Definition
The ability of a solute to dissolve in a solvent at a certain temperature
Term
MIxing
Definition
By stirring or shaking causes the solute particles to separate from one another and spread out more quickly among particles
Term
Heating
Definition
causes particles to move more quickly
Term
Crushing
Definition
Crushing the solute increases the amount of contact it has with the solvent
Term
Suspension
Definition
A mixture in which particles of a material are dispersed through a liquid or a gas but are large enough so that they settle out
Term
Colloid
Definition
A mixture in which the particles are dispersed throughout but are not heavy enough to settle out
Term
Atoms
Definition
The basic unit of matter, one makes up a pure substance
Term
Magnet
Definition
can be used to separate a mixture containing the elements iron and aluminum
Term
Ways to separate a mixture
Definition
Distillation, magnet, centrifuge
Term
Characteristics of Mixtures
Definition
MAde of elements, compuonds or both, there is no change in the original properties of components. It is separated by physical means, and is formed using any ratio of components
Term
Characteristics of compounds
Definition
It is made of elements, there is no change in original properties of compounds. It is separated by chemical means, and it is formed using a set ratio of components.
Term
Dissolving
Definition
The process where the particles of a substance spread and separate evenly in a mixture
Term
Alloys
Definition
Solid solutions of metals or non-metals dissolved in metals
Term
Dilute
Definition
contains less solute than a concentrated item which contains much more solute
Term
States of Matter
Definition
physical forms in which a substance can exist
Term
Solid
Definition
A state of matter that has a definite shape and volume
Term
Liquid
Definition
The state of matter that has a definite volume but takes the shape of its container
Term
Surface Tension
Definition
A force that acts on the particles at the surface of a liquid
Term
Viscosity
Definition
A liquid’s resistance to flow
Term
Gas
Definition
The state of matter that has no definite shape or volume
Term
Temperature
Definition
A measure of how fast the particles in an object are moving.
Term
Volume
Definition
The amount of space that an object takes up
Term
Pressure
Definition
Amount of force exerted on a given area of surface
Term
Boyle's Law
Definition
States that for a fixed amount of gas at a constant temperature, the volume of the gas is inversely related to the pressure. So, as the pressure of a gas increases, the volume decreases by the same amount
Term
Charles Law
Definition
States that for a fixed amount of gas at a constant pressure, the volume of the gas changes in the same way that the temperature of the gas changes. So, if the temperature increases, the volume of gas also increases by the same amount
Term
Change of state
Definition
The change of a substance from one physical form to another
Term
Melting
Definition
The change of state from a solid to a liquid. This change of state is what happens when ice melts.
Term
Evaporation
Definition
The change of a substance from a liquid to a gas. Evaporation can occur at the surface of a liquid that is below its boiling point
Term
Boiling
Definition
The change of a liquid to a vapor, or gas, throughout the liquid. Boiling occurs when the pressure inside the bubbles, which is called vapor pressure, equals the outside pressure on the bubbles, or atmospheric pressure.
Term
Condensation
Definition
The change of state from a gas to a liquid
Term
Sublimation
Definition
The change of state in which a solid changes directly into a gas
Term
Condensation Point
Definition
The temperature at which the gas becomes a liquid
Term
Boiling Point
Definition
The temperature at which a liquid boils
Term
Melting Point
Definition
The temperature at which a substance changes from a solid to a liquid
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