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Science Chemistry!!!

Chem cue cards

TermDefinition
Pure Substance Matter that only contains one kind of particle
Mixture Matter that contains more than one kind of particle
Element A pure substance made up of two or more different elements that are chemically combined.
Compound A pure substance that cannot be broken down into simpler parts by chemical methods.
Physical property A substanc that can not change its scent or type of substance. Can be observed an measured without changing its identity
Chemical property Ability for a substance to change or react and from a new substance.
Physical change -change substance back -go from liquid to solid -doesn't produce new substance -doesn't change original substance
Chemical Change -Can't be reversed -Forms a new substance -Bubbles -Odour changes
Viscosity The resistance of liquid to flowing. Applies to liquids only.
Form The shape of an object
Texture The way a substance feels
Hardness The resistance of a substance to be scratched.
Ducktivity The ability to be stretched into a wire. Applies to metals and other solids.
Malleability The ability of a substance to be hammered into a thin sheet. Applies to metals and other solids
Conductivity The ability of a substance to transmit heat, sounds, or electricity.
Brittleness The ability of an object to break apart or shatter easily.
Solubility A solid (solute) mixing with a liquid (solvent)to make a solution (mixture)
Democritis 400 AD Came up with atomas (smallest thing possible on Earth)
John Dalton 1800 Came up with modern atomic theory and that the atom was a round ball
J.J Thompson 1897 Discovered electrons and made the cathode ray tube experiment: one positive electron in the middle with four negatives around it.
Ernst Rutherford 1907 Discovered nucleus and created the gold foil experiment: Atom was not round and had negative electrons floating aorund the one positive in the centre.
Neils Bohr 1912 Discovered orbitals that the electrons travel on
James Chadwick 1932 Discovered neutron (no electric charge but has negative charge)
Atom The basic unit of a chemical element, smallest thing on Earth.
Electron Subatomic particle that is found in all atoms (negative charge)
Subatomic Particle A body having finite mass and internal structure
Nucleus DNA holder of a cell. Central and msot important part of cell. Found in atoms
Proton A subatomic particle occuring in a nucleus (positive charge)
Neutron Subatomic particles, similiar to a proton bu without electric charge.
Alkali Metals React rapidly when exposed to air or water. Low melting points and very soft.
Alkaline Earth Metals Highly reactive but less than alkali metals. Produce bright, colourful flames. Used in fireworks
Halogens Most reactive non metals. Extremely corrosive. Fluorine can be used to etch glass. Chlorine as a gas produces serious respiratory problems. Bromine causes serious skin burns.
Noble gases Non-reactive Odourless, colourless Produce interesting colours when excited by electricity
Periods Horizontal rows from groups 1-7 on the periodic table.
Groups Vertical rows on periodic table
Metal Shiny, ductile Conductors of heat and electricity
Non-metal Bull and brittle Poor conductors Good insulators
Metalloid
Ion positively or negatively charged atom or molecule. Atom becomes an Ion when an atom loses or gains electrons
Cation Positively charged ion
Anion Negatively charged ion
Created by: EMunoz19