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Science Chemistry!!!
Chem cue cards
| Term | Definition |
|---|---|
| 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
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