C1- Atomic structure

Smallest part of an element that can exist

Substance made up of only one type of atom

2 or more elements chemically combined in fixed proportions

A group contains elements with similar chemical properties

Iodine, bromine, chlorine, fluorine, oxygen, nitrogen, hydrogen I buy clay for our new house

Same number of each atom on both sides of equation

Total mass of products equal to total mass of reactants

(s) Solid (g) Gas (l) Liquid (aq) Aqueous

A substance dissolved in water

Two or more substances that are not chemically combined

Pour mixture through filter paper in a funnel Filtrate that passes through the paper Insoluble solids stay on the filter paper

Heat mixture to dryness in evaporating basin Residue left in basin Evaporated solvent

Heat mixture gently until only solvent evaporates, vapours condensed Condensed solvent Dissolved solids

Heat mixture, partially evaporate solvent in evaporating basin. Cool slowly for crystals Crystals in basin Evaporated solvent

Heat; liquids vaporise to fractionating column with temp gradient. Lowest boiling point liquid reaches condenser, others fall back. Condensed liquid with lowest boiling point Liquids with higher boiling points

Place samples on filter paper that touches a solvent. Substances travel dif distances on paper None All- used for analysis, products not recovered

Atomic model -substances made of atoms -atom is smallest part of any element

Plum pudding model -Discovered electron -Found relative mass & charge of electron -Embedded in positive cloud

Nuclear model -Discovered tiny, positive,massive nucleus - Electrons orbit nucleus

Planetary model -Electrons orbit at fixed distances -Electron shells have different energy levels

Proton neutron model -Discovered neutrons have no charge and same mass

Rutherford fired alpha particles at thin gold foil Particles scattered and some reflected back Proved tiny, massive, positive, central nucleus

p+ 1 +1 Nucleus

n 1 0 Nucleus