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Cohen's Final DKJA
Final 2009
64
Science
8th Grade
05/20/2009

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Cards

Term
Wave
Definition
a disturbance that travels energy from one place to another
Term
Medium
Definition
material through which a wave travels
Term
Mechanical wave
Definition
wave that needs a medium to travel through
Term
Vibration
Definition
a repeated back and forth or up and down motion
Term
Transverse wave
Definition
wave that moves a medium in direction perpendicular to the direction in which the wave travels
Term
Crest
Definition
the highest point of a wave
Term
Trough
Definition
the lowest part of the wave
Term
Longitudinal wave
Definition
a wave that moves a medium parallel to the direction in which the wave travels
Term
Compression
Definition
the part of the longitudinal wave in which the particles are close together
Term
Rarefaction
Definition
the part of a longitudinal wave where the particles of the medium are far apart
Term
Amplitude
Definition
the maximum distance the particles of a medium move away from their rest position as a wave passes through the medium
Term
Wavelength
Definition
the distance between the crest of one wave and the crest of the next
Term
Frequency
Definition
the number of complete waves that passes at a given point in a certain amount of time
Term
Electron
Definition
Tiny negatively charge high energy particle that moves in the space outside the nucleas of an atom
Term
Hertz
Definition
a measurement for frequency
Term
Reflection
Definition
the bouncing back of a wave when it hits a surface through which it can not pass
Term
Refraction
Definition
the bending of waves as they enter a different medium
Term
Diffraction
Definition
the bending of waves around the edge of a barrier
Term
Constructive interference
Definition
the interference that occurs when 2 waves combine to make a wave of a larger amplitude
Term
Destructive interference
Definition
interference that occurs when two waves combine to make a wave of a smaller amplitude
Term
Standing wave
Definition
a wave that appears to stand in one place even though it is two waves passing through each other
Term
Node
Definition
a point of zero amplitude on a standing wave
Term
Antinode
Definition
point of maximum amplitude on a standing wave
Term
Resonance
Definition
they increase in the amplitude of vibration when external vibrations match the objects natural frequency
Term
Electromagnetic wave
Definition
transverse waves that transfer electric and magnetic energy
Term
Electromagnetic spectrum
Definition
the range of electromagnetic waves placed in a certain order
Term
Polarized
Definition
light that vibrates in only one direction
Term
Polarized
Definition
light that vibrates in only one direction
Term
Photon
Definition
a tiny particle or packet of light energy
Term
Radio wave
Definition
electro magnetic waves with longest wavelength and lowest frequency
Term
Microwave
Definition
radio wave with the shortest wavelength and highest frequency
Term
Infrared ray
Definition
electromagnetic waves with highest frequency and shortest wavelength than radio waves
Term
Visible light
Definition
electromagnetic radiation that can be seen with the unaided eye
Term
Ultraviolet ray
Definition
electromagnetic waves with a frequency higher than visible light but lower than x-rays
Term
X-ray
Definition
electromagnetic waves with a frequency higher than ultra violet but shorter than gamma rays
Term
Gamma ray
Definition
electromagnetic waves with the shortest wavelength and highest frequency
Term
Doppler Effect
Definition
the apparent change in frequency of a sound as a source moves in relationship to the listener
Term
Neutron
Definition
Small uncharged particle in the nucleas of an atom
Term
Atomic Number
Definition
The number of protons in the nucleus of an atom
Term
Valance Electron
Definition
Are electrons farthest away from the nucleus
Term
Electron Dot Diagram
Definition
Represantation of the number of valance electrons in a atom using dots place around the symbal of an element
Term
Atomic Mass
Definition
The average mass of one atom of an element
Term
periodic table
Definition
an arrangement of the elements in order of atomic number in which elements of similiar properties are grouped in columns
Term
group (family)
Definition
elements in the same vertical column of the periodic table
Term
Period
Definition
Horizontal Row of elements in the periodic table
Term
Malleable
Definition
Term used to describe material that can be pounded or rolled into shape
Term
Ductile
Definition
A term used to describe a material that can be pulled out into a long wire
Term
Conductor
Definition
A substance through which electrons move freely transmiting heat or electricity
Term
Alkali Metal
Definition
It is the first row in the periodic table
Term
Akaline Earth Metal
Definition
The Second row in the periodic table
Term
Transition Metal
Definition
Rows 3-12
Term
Non Metal
Definition
An element that lacks most of the properties of metals
Term
noble gas
Definition
an element in group 18 of the periodic table
Term
metalloid
Definition
an element that has some of the characteristics of metal and some of non-metals
Term
precipitate
Definition
a solid that forms from a solution during a chemical reaction
Term
endothermic reaction
Definition
a reaction that absorbs energy in the form of heat
Term
exothermic reaction
Definition
a reaction that releases energy in the form of heat
Term
chemical equation
Definition
a short easy way to show a chemical reaction using symbols instead of words
Term
reactants
Definition
a substance that enters into a chemical reaction
Term
products
Definition
a susbstance formed a s a result of chemical reaction
Term
conservation of mass
Definition
the principle stating that matter is not created or destroyed during a chemical reaction
Term
synthesis
Definition
a chemical reaction in which 2 or more simple substance combine to form a new more complex susbstance
Term
decomposition
Definition
a chemical reaction that breaks down a compound into simpler products
Term
replacement reaction
Definition
a reaction in which one element replaces another in a compound or in which two elements in different compounds trade places
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