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Chemistry
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60
Chemistry
11th Grade
02/24/2011

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Term
Acid
Definition
substance that forms a sour solution in water, because of the formation of the hydrogen ions, has a pH of less than 7
Term
Atomic Number
Definition
number of protons in the nucleus of an atom
Term
Atoms
Definition
unit of matter, smallest unit of an element, having all the characteristics of that element
Term
Base
Definition
substance that forms a bitter solution in water, because of the formation of hydroxide ions, as a pH of more than 7
Term
Boiling Point
Definition
temperature at which a liquid turns into a gas (100 degrees Celsius)
Term
Carbon dating
Definition
determination of the approximate age of an object, by measuring the amount of carbon-14 it contains
Term
Chemical Property
Definition
property used to characterize materials in reactions that change their identity
Term
Chemical change
(Chemical reaction)
Definition
any process that involves rearrangement of the molecular or ionic structure of a substance, creating a new substance
Term
Chemical composition
Definition
relation stating that the relative masses of elements are fixed in a given chemical substance
Term
Chemical formula
Definition
representation of a substance using symbols for its elements
Term
Compound
Definition
substance that consists of atoms/ions of 2 or more different elements, cannot be separated by physical means
Term
Concentrated
Definition
to make a solution less diluted, stronger
Term
Conduction
Definition
process by which heat or electricity is transmitted through an object or between objects in direct contact
Term
Conservation of Matter/Energy
Definition
neither energy or matter can be lost or destroyed
Term
Convention
Definition
circular motion that occurs in a heated fluid, as hot fluid rises and cooler fluid sinks
Term
Covalent Bond
Definition
chemical bond between nonmetals, where electrons are shared
Term
Density
Definition
an object's mass divided by it's volume
Term
Dilute
Definition
to lessen the force, strength, or purity of a mixture
Term
Dissolution
Definition
acting of dissolving, or separating into parts, weaken
Term
Electromagnetic Radiation
Definition
waves of energy that can travel through a vacuum, includes: radio waves, infrared waves, visible light, ultraviolet light, gamma rays, and x-rays
Term
Electron
Definition
subatomic particle that is negatively charged and outside the nucleus
Term
Element
Definition
substance composed of atoms having identical number of protons in the nucleus
Term
Empirical formula
Definition
chemical formula that indicates the relative proportions of the elements in a molecule rather than the actual number of atoms of the elements
Term
Endothermic
Definition
chemical reactions that require and absorb energy
Term
Energy
Definition
capacity for work
Term
Exothermic
Definition
chemical reaction that produces and releases energy
Term
Fission
Definition
splitting of an atomic nucleus, releasing large amounts of energy
Term
Fusion
Definition
the joining of atomic nuclei to form heavier nuclei, releasing enormous quantities of energy
Term
Half-time
Definition
time required to convert 1/2 of a reactant to product
Term
Heat
Definition
form of energy associated with the motion of atoms and the capability of being transmitted through solid and fluid media
Term
Ion
Definition
charged particle, caused by the gaining or losing 1 or more electrons
Term
Ionic bond
Definition
chemical bond between metal and nonmetal, transfer of electrons
Term
Isotope
Definition
different atoms of the same element with the same atomic number but different mass numbers, due to different number of neutrons
Term
Lewis Dot Structure
Definition
way of representing atoms or molecules by showing electrons as dots surrounding the element symbol, 1 bond is represented as 2 electrons
Term
Mass
Definition
amount of matter an object has
Term
Matter
Definition
anything that has mass and takes up space
Term
Metal
Definition
group of elements, on the left side of the Periodic Table, they lose electrons when they become ions, are generally hard, shiny, ductile, and good conductors of heat and electricity
Term
Mixture
Definition
composition of 2 or more substances that are not chemically combined and capable of being separated
Term
Mole
Definition
amount of substance that contains as many atoms, molecules, ions, or other units as the number of atoms in 12 grams of carbon-12
Term
Molecular Formula
Definition
chemical formula that shows the number and kinds of atoms in a molecule
Term
Molecule
Definition
smallest particle of a substance
Term
Neutron
Definition
an uncharged particle found in the nucleus with a mass equal to a proton
Term
Nonmetal
Definition
located on the right side of the Periodic Table, gains electrons, poor conductors of heat and electricity, several are gases
Term
Nuclear Reaction
Definition
reaction based on splitting or fusing the atomic nuclei, releasing vast energy
Term
Nucleus
Definition
the positively charged central portion of an atom that comprises nearly all of atomic mass and that consists of protons and neutrons
Term
Periodic Table
Definition
table showing all the known elements based on their atomic numbers, arranged into periods and groups based on common properties and electron arrangement
Term
Physical Property
Definition
property used to characterize physical object (description of the object)
Term
Physical change
Definition
change from 1 state to another, or characteristic, without changing their identity
Term
Product
Definition
result of a chemical reaction
Term
Proton
Definition
particle in the nucleus of an atom with a positive charge and the atomic mass of 1
Term
Radiation
Definition
waves of energy that can travel through a vacuum
Term
Radioactive Decay
Definition
when an unstable nucleus decays, emitting subatomic particles and radiation
Term
Reactant
Definition
substance that is at the beginning of a chemical reaction
Term
Solubility
Definition
the quality, condition, or degree of being soluble or solvable
Term
Solution
Definition
homogeneous mixture of 2 or more substances
Term
States of Matter
Definition
  1. state
  2. liquid
  3. gas
Term
Substance
Definition
form of matter with a uniform chemical structure; is either an element or compound
Term
Temperature
Definition
measure of the average kinetic motion of particles in an object
Term
Thermal Energy
Definition
heat energy based on the motion of molecules and atoms in a substance
Term
pH scale
Definition
measure of the acidity or alkalinity of a chemical solution on a scale of 0 to 14
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