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science final 2
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67
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8th Grade
05/23/2011

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Term
wavelength
Definition
distance between two succesive compressions
Term
frequency
Definition
the number of complete vibrations that pass a point in a second
Term
speed
Definition
the distance that the wave travels in a unit of time
Term
amplitude
Definition
amount of matter that vibrates, loudness of a sound
Term
Speed of Sound
Definition
332 m/sec @ 0°c
Term
Distance
Definition
Rate * Time
Term
Echo
Definition
occurs when sound hits a hard object and rebounds
take the time given to you and divide it by 2 then multipy it by the speed of sound(modify it if not a 0°c)
Term
Pipes
Definition
If using a close end tube multiply the sound wave by 4
If using an open end tube multipy the sound wave by 2
Term
Reflection
Definition
When a ray of light strikes a smooth shiny surface, the ray is reflected
Term
incident ray
Definition
the light ray that strikes the surface
Term
reflected ray
Definition
the light ray that bounces off the surface
Term
normal line
Definition
line drawn at right angles to the surface
Term
Angle of incidence
Definition
the angle between the incident ray and the normal
Term
Angle of reflection
Definition
the angle between the reflected ray and the normal
Term
angle of refraction
Definition
of refraction-the angle between the refracted ray and the normal
Term
Index of refraction
Definition
sin of the angle of incidence over/ the sin of the angle of refraction
Term
Speed of Light
Definition
1.86 x 105 mi/sec
3 x 108 m/sec
Term
Types of lenses
Definition
concave, convex
Term
concave
Definition
thicker at the edges than in the middle, diverging lens
Term
convex
Definition
thicker in the middle than at the edges, converging lens, magnifying glass
Term
Light
Definition
primary, secondary
Term
primary
Definition
blue, red, and green
Term
secondary
Definition
cyan, magenta, yellow
Term
Periodic table of elements
Definition
metals, nonmetals,metaloids
Term
metals
Definition
left side
Term
nonmetals
Definition
right side
Term
noble gases
Definition
column 18 the column all the way to the right
Term
Alkali metals
Definition
column 1 the column all the way to the left
Term
Alkaline Earth metals
Definition
column 2 the column 2nd from the left
Term
Diatomic gases
Definition
Hydrogen, Chlorine, Nitrogen, Iodine, Oxygen, Fluorine, Bromine
Term
Electron arrangement
Definition
spdf
Term
Valence number
Definition
the combining tendency of the atoms of an element
Term
Atomic Number
Definition
the specific number of protons in an atom
Term
number of protons
Definition
same as atomic number
Term
number of electron
Definition
same as the number of protons
Term
Atomic mass
Definition
total mass of the protons and neutrons in an atom
Term
number of neutrons
Definition
atomic mass-protons
Term
Polyatomic ions
Definition
radicals
Term
protons
Definition
positively charged particle
located in the nucleus of atoms
Term
Atomic particles
Definition
electrons, protons, neutrons
Term
neutron
Definition
neutrally charged particle
located in the nucleus of an atom
Term
electron
Definition
negatively charged particle
moves in orbit around the nucleus
Term
Ionic bonding
Definition
An attraction between two oppositely charged ions, metal and non-metal
Term
writing chemical compounds
Definition
writing chemical compounds
Term
Naming
Definition
metals with multiple valence numbers use roman numerals to express the valence
ide ending unless a polyatomic ion
Term
Covalent bonding
Definition
electrons from 2 or more atoms are shared
naming
Term
prefixes for covalent bonding
Definition
mono,di, tri, tetra
Term
Formula (molecular) mass
Definition
the sum of all the atomic masses in a molecule
Term
synthesis
Definition
a reaction in which two or more elements form a compound, direct combination reaction, A+B=AB
Term
decomposition
Definition
-a reaction in which a compound is broken down into two or more elements, analysis, AB=A+B
Term
single replacement
Definition
A reaction in which one element reacts with one compound to form another element nd another compound, A+BC=AC+B
Term
double replacement
Definition
A reaction in which the metals present in tow compounds change places to form two new compounds, AB+CD=AD+CB
Term
Neutralization
Definition
acid +base= salt + water
Term
balancing
Definition
sure there are the same amounts of elements on each side
Term
Reactivity series lab
Definition
be able to tell if it is more reactive than another metal from looking at equations
Term
solute
Definition
the substance that is dissolved in a solution
Term
solvent
Definition
the substance that does the dissolving in a solution
Term
rate of dissolving
Definition
temperature, particle size, stirring
Term
amout that dissolves
Definition
temperature, and pressure
Term
dilute
Definition
contains relatively little solute in a given amount of solvent, weak
Term
concentrated
Definition
contains a large amount of solute in a given amount of solvent, strong
Term
unsaturated
Definition
the solvent can dissolve more solute at the same temperature
Term
saturated
Definition
the solvent has dissolved as much solute as it can hold at a given temp
Term
solubility curves
Definition
shows the amount of solute to use in order to prepare a saturated solution at a paricular temp
Term
supersaturated
Definition
the solvent holds more solute than it normally can at a given temp
Term
Acids
Definition
Acids taste sour
Acids turn litmus ret
Acids contain replaceable hydrogen
Acid releases hydrogen ions in water solutions
Term
bases
Definition
Bases taste bitter
Bases feel slippery
Bases turn litmus blue
Bases release hydroxide ions in water
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