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Chem chapter 2, vocb

September 17th-Oct. 3rd, 2012

Matter anything that has mass & takes up space
Mass amount of matter in an object (depending on gravity.)
Atoms tiny building blocks that matter is composed of
Elements simplest form of matter
Compounds 2 or more different types of atoms are chemically bond together
Molecules particles that compose a compound; made up of 2 or more different kinds of atoms stuck together by chemical bonds
what are physical properties that can identify a substance? odor, color, melting point, mass, boiling point, density, volume
chemical properties pertain to the ability of a substance to form a new substance by reacting with other substance
physical change do not involve a change in the idenity of the substance
chemical change involve reactions in which one or more substances are converted to new substances
phase change all phase changes are physical changes. only involve a change in the energy and speed of the particles. Particles retain their idenity
chemical when one or more substances are changed into new substances
reactants stuff you start with
products what you make. *products have new properties
solid matter that can not flow and has definite volume
liquid definite volume but takes the shape of its container ( flow)
gas no definite volume or definite shape and can flow
denisty ice floats, because of a phase change
volume ice expands ( the expansion of water when it freezes is a major source of weathering rocks; they crack and break apart) ; because of a phase change
electronolysis H20 --> H2 + O2 H2O(L) --> H2O(g)
phase changes are all physical; only involve a change in the energy& speed of particles; particles retain their idenity
mixtures made up of two substances
heterogeneous mixture is not the same from place to place ex. chocolate chip cookies, gravel, trail mix
homogeneous same composition throughout ex. kool-aid, air
solution homogeneous mixtures; mixed by molecule to molecule; can occur between any state of matter
solute substance that is known to dissolve
solvent substance that which the solute dissolves
elements simplest kind of matter; cannot be broken down; all one kind of atom
compounds substances that can be broken down by chemical methods
molecules two or more atoms ( smallest piece of a compound)
periodic table columns referred to as groups; rows referred to as periods; 90 natural occurring elements(BOLD) *blue letters= liquid at room temperature **red letters= gas at room temperature
properties of metal conductors of heat & electricity; mallebe ( dent) ; ductile ( pull-able ( stretchy)) ; high tensile strength; luster ( shine ( nice surface))
properties of nonmetals poor conductors of heat & electricity; tend to be brittle; many nonmetals are gases at room temperature
properties of metallbids both metals & nonmetals; metalloids more brittle than metals, less brittle than most nonmetallic solids; semiconductors of electricity; some metalloids posses metallic luster
silicon metallic luster; brittle like a nonmetal; semiconductor of electricity
chemical change a change in which one or more substances are converted into different substances ( heat & light are often evidence of a chemical change)
chemical reaction when one or more substances are changed into a new substance
reactants stuff you start a chemical reaction with
products what you make after finishing the chemical reaction
indications of a chemical change energy absorbed or released; color change; odor change; precipitate - solid that separates from the solution
chemical property pertains to substances ability to react with other substances
Created by: akeefe