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module 1-7
Vocab
32
Chemistry
11th Grade
05/23/2013

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Term
Solid
Definition
Of definite shape and volume; not liquid or gaseous
Term
Liquid
Definition
The state of matter in which a substance exhibits a characteristic readiness to flow, little or no tendency to disperse, and relatively high incompressibility
Term
Gas
Definition
The state of matter distinguished from the solid and liquid states by relatively low density and viscosity, relatively great expansion and contraction with changes in pressure and temperature, the ability to diffuse readily, and the spontaneous tendency to become distributed uniformly throughout any container.
Term
Mixture
Definition
A mixture is what you get when you combine two substances in such a way that no chemical reaction occurs between the components and you can separate them again.
Term
Pure Substance
Definition
a pure substance is any single type of material.
Term
Atomic Number
Definition
It is the number of protons in the nucleus of an atom.
Term
Alpha Radiation
Definition
have the highest ionizing power; since they carry the positive charge.
They also has a very high diffraction in the air.
They travel at 1/20th of the speed of light.
Term
Beta Radiation
Definition
They can penetrate more than a piece of paper, though they generally stop penetrating after passing through an aluminium sheet. 
Beta rays have a moderate ionizing power, since they carry the negative charge. 
They have a moderate diffraction in the air.
They travel at almost the speed of light.
Term
Gamma Radiation
Definition
They can penetrate at a larger area; and can be stopped by a thick lead block.
Gamma rays have almost no ionizing power, as they carry no charges.
Gamma rays travel at the speed of light.
Term
Fission
Definition
splitting of a nucleus into smaller parts
Term
Fusion
Definition
Nuclei combine to form a nucleus with a greater mass
Term
Half Life
Definition
Amount of time it takes for half of a radioisotope to decay
Term
Period
Definition
rows in the periodic table
Term
Groups/Families
Definition
Columns in the periodic table
Term
Alkali Metals
Definition
soft very reactive
Term
Alkaline Earth Metals
Definition
Stronger, very reactive
Term
Transition Metals
Definition
some dont react, colorful
Term
Halogens
Definition
most active non metals
Term
noble gases
Definition
stable, non reactive
Term
Metalloids
Definition
have characteristics of metals and non metals.
Term
Electronegativity
Definition
ability for an atom to attract electrons
Term
Cation
Definition
positive ion
Term
anion
Definition
negative ion
Term
VSEPR theory
Definition
Valance Electron pairs repel eachother
Term
Non Polar Bond
Definition
no partially charged regions so electrons are equally shared in bonds
Term
Diople- Diople Forces
Definition
Occur between molecules with pereminent opposite charges.
Term
Moles
Definition
Used because atoms and molecules are too small to measure.
Term
Synthesis Reaction
Definition
A+B -> AB
Term
Decompsition Reaction
Definition
AB -> A+B
Term
Single Replacement Reaction
Definition
A + BX -> AX +B
Term
Double Replacement Reaction
Definition
AB+ CD -> AD + BC
Term
Stoichiometry
Definition
uses mole ratios from the balanced equation
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