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Science Topic 4 Definitions 2011

Chemistry Scientific study of matter, its properties and its interaction with other matter and energy
Model A representation of something based on a set of assumptions, usually determined through experiments
Charge The net effect of losing or gaining atoms
Atom The smallest particle of an element
Element A substance made of only 1 type of atom
Molecule A group of atoms joined by bonds
Compound A group of different atoms that are joined in a fixed ratio
Periodic Table The arrangement of elements into a table of groups and periods
Electron shells The arrangement of electrons around the nucleus based on energy levels
Chemical formula A shorthand way of writing the name of an element or compound
Word equation Show the changes that occur in a chemical reaction
Chemical reaction Interactions in which atoms exchange or share electrons forming new chemical compounds
Reactant The chemical compounds that combine to start a chemical reaction
Products The chemical compounds that are produced during a chemical reaction
Protons Defining components of atom which are found in the nucleus and have a positive charge
Neutron Particles with no charge in an atom which create different isotopes
Electron Negatively charged components of an atom which orbit the neuclus
Ion Charged atom due to a different amount of protons to electrons
Isotope Atoms of element with different number of neutrons
Nucleus Makes up 1/10,000 of space in atom
Chemical symbol Unique 1-3 letters which name a chemical
Atomic number Number of protons in 1 atom of element
Atomic weight Average weight of 1 atom of element
Period Row of elements
Mass number Number of protons + number of neutrons
Electrolysis Using electricity to cause a chemical change
Decomposition Breakdown of compound into simpler substances
Ionic Type of compound made from attraction of metal and non-metal ions
Covalent Type of compound made from 2 non-metals that share electrons
Lattice Large array of atoms or ions that repeats itself millions of times
Flame test Where the colours of the flame are used to identify the types of atoms present
Equation A written record of the reactants and products in a chemical reaction
Lime-water Reagent used to test for presence of carbon dioxide
Limestone Types of rock dissolved away by carbon dioxide gas dissolved in rainwater
Precipitate An insoluble substance that forms when ions come together
Suspension An insoluble substance shaken in water
Neutralisation Reaction where an acid and a base react and destroy each other
Calcium carbonate Chemical substance present in lime, limestone, caves, chalk and cement
Combustion Burning
Combination 2 elements combining to form a single compound
Created by: PCGEEK