Vocabulary Flashcard

Endothermic
a reaction in which energy is absorbed
Exothermic
a reaction in which energy is released
Evaporation
change of a substance from liquid to gas
Halogens
highly active metals in group 17
Alkali
highly active metals in group 1
Alkaline Earth
highly active metals in group 2
Hydronium Ions
the ion that makes a solution acidic
Hydroxyl Ions
the ion that makes the solution basic
Indicator
An organic compound that changes color in an acidic or basic solution
Isotope
Atom of the same element that have different number of neutrons
Kenectic Energy
energy of motion
Law of Conservation of Energy
Energy can change form, but cannot be created or destroyed under ordinary conditions
Law of Conservation of Mass
Matter is neither created or destroyed during a chemical change
Mechanical Energy
the total amount of Kenectic and Mechanical Energy in a system
Malleable
ability of metals to be hammered or rolled into thin sheets
Metalloids
elements that have properties of metals and nonmetals
Mixture
A material made of elements or compounds stirred together but not chemically combined
Neutron
atomic particle with no charge found in nucleus
Nonmetals
Elements that are usually gases or brittle solids at room temperature, most do not conduct heat or electricity.  They appear on the right of the periodic table
Metals
Elements that are usually solids at room temperature; most conduct heat and electricity.  Most of the elements on the left of the stair step line of the periodic table are metals.
Nucleus
positively charged center of an atom that contains protons and neutrons
Period
horizontal row on the periodic table
Group/Family
Vertical sections on the periodic table, usually classified by the number of electrons in the outer shell
Phenothalein
Vertical sections on the periodic table, usually classified by the number of electrons in the outer shell
Dilute Solution
The amount of solute is much less than the maximum solvent can hold at that temperature
Ductile
abilitlty of metals to be pulled into wire tubing
Condensation
the change of a substance from gas to liquid
Density
mass per unit volume of material
Diatomic
a molecule composed of 2 atoms of the same element
Electron
the negatively charged part of an atom found outside of a nucleus
Gas
no definite shape or volume
Solid
definite shape or volume
LIquid no definite shape, definite volume
Plasma
A gas like mixture of charged particles that exists at extremely high temperatures – examples are fluorescent lightning, stars
Chemical property
characteristic used to descibe a substance such as flammable
Chemical change
when a new substance is created by reactants
Physical Change
when you change the size or shape still the orignal substance 
Physical Property
Any characteristic of a material that you can observe without changing the substance/s that make up the material
Subscript
like h2o the # of atoms in the element
Coefficent
# of units of each system like 2Ag
Ionic Bond
metals lose their electrons nonmetals gain electrons
Covalent Bond
2 nonmetals share their electrons
Formula
# and symbol of element
Element
substance in which the elements and their ratio are given
Compound
a substance chemically combioning 2 or more elements
Acids
produce hydrogen ions has pH less than 7
Bases
produces hydroxide ions  pH greater than 7
Ion
positively or negatively charged particle
Atomic #
# of prtons in the atom’s nucleus
Chemical Bond
the force that holds together an atom and a compound
Symbol
the shorthand way 2 write an element
Chemically Stable
Describes an atom whose outer energy level is completely filled with electrons
Pickling
A process that removes impurities from the surface of steel and other metals by dipping them in HCl
Products
in a chemical reaction the substance produced
Reactants
the beganing substance of a chemical reaction
Protons
the positively charged particle found in the nucleus
Potential Energy
Stored Energy
Sublimation
change of substance dirrectly solid to gas

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