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Mr. Pfriem's Chemistry Vocab
Vocabulary Words for Mr. Pfriem's chemistry class
97
Chemistry
12th Grade
02/28/2012

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Term
Electrons
Definition
Subatomic waves that have negative electrical charges
Term
Protons
Definition
Subatomic particle that has a positive electrical charge
Term
Neutrons
Definition
Subatomic particle that has no charge
Term
Nucleus
Definition
Central location of an atom that contains protons and neutrons
Term
Matter
Definition
Anything that has mass and volume
Term
Inference
Definition
Assumption/conclusion derived from an observation
Term
Heterogeneous Mixture
Definition
Physical blend in which substances are not distributed evenly
Term
Homogeneous Mixture
Definition
Physical blend in which substances are distributed evenly
Term
Control Group
Definition
Part of the experiment that doesn't contain the cause.
Term
Condensation Point
Definition
Temperature at which gas becomes a liquid
Term
Melting Point
Definition
Temperature at which a solid becomes a liquid.
Term
Metric System
Definition
Group of measurements all based on the number 10
Term
Boyle's Law
Definition
At constant temperature, the pressure of a gas is inversely proportional to its volume.
Term
Kinetic Molecular Theory
Definition
Explanation of how gas particles behave.
Term
Element
Definition
Pure substances made up of only 1 type of atom.
Term
Atom
Definition
An uncharged particle that weights the R.O.A.M.
Term
Isotope
Definition
Particles that don't weigh the R.O.A.M.
Term
Heavy Isotope
Definition
Particles weighing more than the R.O.A.M.
Term
Light Isotope
Definition
Particles weighing less than the R.O.A.M.
Term
Atomic Number
Definition
Amount of protons in the nucleus of that element.
Term
Atomic Symbol
Definition
Abbreviation of an element
Term
Charge Number
Definition
Electrical intensity of a particle
Term
Periodic Table
Definition
Chart listing all known elements
Term
LCM (Law of Conservation of Matter)
Definition
Matter can neither be created nor destroyed under normal circumstances.
Term
Electron Cloud
Definition
General space where electrons travel
Term
Coefficcient
Definition
Total number of particles
Term
Molar Mass
Definition
Weight of 6.02 x 10^23 particles
Term
Mass Number
Definition
Specific weight of an individual particle
Term
Metalloid
Definition
Element that has properties of both metals and non-metals
Term
Metal
Definition
Element on left side of PT
Term
Ion
Definition
Electrically charged particle
Term
Non-metal
Definition
Elements on right side of PT
Term
Oxidation number
Definition
Electrical charge that an atom would like to have in order to become stable
Term
Valence Configuration
Definition
Mathematical description of the outermost electrons in a particle
Term
Stability
Definition
Tendency not to react
Term
Compound
Definition
Pure substances made up of only one type of molecule
Term
Observation
Definition
Information gained directly from one or more of the five senses.
Term
Physical reaction
Definition
Change in which NO new substances form
Term
Gram
Definition
Standard unit of mass in metric system
Term
Science
Definition
Study of the unknown
Term
Mole
Definition
6.02 X 10^23
Term
Experimental group
Definition
Part of experiment that contains the cause
Term
Experiment
Definition
Test of hypothesis
Term
Chemical reaction
Definition
Change in which one or more new substances form
Term
Data
Definition
Objective info gathered from experiment
Term
Hypothesis
Definition
Proposed solution to a scientific problem
Term
Chemistry
Definition
Study of structures, properties and compositions of matter, and changes in that matter.
Term
Anion
Definition
Negatively charged particle
Term
Cation
Definition
Positively charged particle
Term
Density
Definition
Physical property describing thickness of a substance
Term
Subscript
Definition
Number of atoms in a molecule
Term
Molecule
Definition
Smallest unit of compound and still have all the properties of that compound
Term
Mixture
Definition
Blend of two or more substances physically combined in a variable ratio
Term
Catalyst
Definition
Anything that makes a chemical reaction go faster without being used up.
Term
Water displacement
Definition
Method for finding volume of an irregular shaped object
Term
Mass
Definition
Amount of matter in an object
Term
Volume
Definition
Amount of space an object takes up
Term
Length
Definition
Distance from one point to another
Term
Liter
Definition
Standard unit of volume in metric system
Term
Meter
Definition
Standard unit of length in the metric system
Term
Energy level
Definition
Amount of energy an electron has which is based on its distance from the nucleus
Term
Theory
Definition
Explanation of an unknown phenomenon based on all the knowledge known to man
Term
Sublevel
Definition
Group of similar oribitals within the same energy level
Term
Pressure
Definition
Force applied per unit area from molecular collisions
Term
Scientific Method
Definition
Series of steps to solve the unknown
Term
Transition Metals
Definition
B column elements, D block elements
Term
Atomic Mass
Definition
Average weight of all isotopes of an element
Term
Representative elements
Definition
A column elements, s + p block elements
Term
Model
Definition
Physical representation designed to make a difficult concept easier to understand
Term
Freezing point
Definition
Temperature at which a liquid becomes a solid
Term
Heat
Definition
Total kinetic energy of a system
Term
Boiling point
Definition
Temperature in which liquid becomes a gas
Term
Temperature
Definition
Average kinetic energy of a system
Term
Endothermic reaction
Definition
Change in which heat is absorbed.
Term
Exothermic Reaction
Definition
Change in which heat is released
Term
Guy-Lussac's Law
Definition
At constant volume the pressure of a gas is directly proportional tot he temperature of that gas
Term
Charles Law
Definition
At constant pressure the volume of a gas is directly proportional to the temperature of that gas.
Term
Crystal Lattice (crystal)
Definition
Solid that repeats its structure over and over. (regular repeating structure)
Term
Hydrate
Definition
Ionic compound with a fixed number of water molecules in its structure
Term
Anhydrous compounds
Definition
Do not take in any water
Term
Ionic Compound
Definition
Group of two or more ions bonded ionically
Term
Molecules
Definition
Group of two or more atoms bonded covalently
Term
Nomenclature
Definition
study of naming things
Term
Monoatomic Ion
Definition
Charged particle that came from one atom i.e. K2
Term
Polyatomic Ion
Definition
Charged particle that came from more than one atom i.e. NaCl
Term
Ionic bonds
Definition
Attraction between Ions caused by opposite electrical charges. (nothing shared)
Term
Covalent bonds
Definition
Attraction between atoms caused by sharing of valence electrons
Term
Electronegativity
Definition
Tendency of a particle to pull valence electrons from another particle
Term
Electronegativity Difference
Definition
Difference between ability to take electrons
Term
Diatomic Molecules
Definition
Covalent compound made up of two of the same types of atoms
Term
Polar Covalent Bond
Definition
Attraction between two atoms in which valence electrons are UNEVENLY shared
Term
Non-Polar Covalent Bond
Definition
Attraction between two atoms in which valence electrons are EVENLY shared.
Term
Hydrophobic Molecule
Definition
Covalent compound that will not dissolve in water. Made by non-polar covalent bonds.
Term
Hydrophilic
Definition
Covalent compound that will dissolve in water. Made by polar covalent bond.
Term
Empirical
Definition
Formula in simplest state
Term
Single/double/triple covalent bonds
Definition
attraction between 2 atoms in which 1/2/3 pairs of valence electrons are shared.
Term
Valence Shell Electron Pair Repulsion Theory
Definition
Free electron pairs take up more space than bonded electron pairs
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