GCSE Chemistry: Atomic Structure (Keywords (The law of conservation of…
Separating Mixtures: Methods
: Separate soluble substances from each other.
: Using a fractionating column, separate liquids from a solution based on boiling points.
: Heat a solution to evaporate it, then condense the liquid for collection.
: Evaporate the liquid away to leave soluble solids crystals behind.
: Use a filter to separate an insoluble solid from a liquid.
The Structure of an Atom
Virtually no Relative Mass. There is some, but it is so little that is doesn't count.
-1 Relative Charge
1 Relative Mass
0 Relative Charge
1 Relative Mass
+1 Relative Charge
The History of the Atom
The alpha scattering experiments proved the plum pudding model wrong, replacing it with the nuclear model, which showed a small positively charged nucleus surrounded by electrons orbiting in shells. Later experiments led to the discovery of neutrons and protons.
When the electron was discovered, the plum pudding model was created, which showed the atoms as solid spheres of positive charge with negative electrons embedded in them.
Initially, people believed atoms where tiny spheres, the smallest thing possible.
The law of conservation of mass
: In a reaction, the atoms are rearranged into compounds, so mass is never gained or lost in a chemical reaction
: Atoms of the same element but with different numbers of neutrons.
: Two or more substances mixed together, but not chemically bonded.
: A substance made from different kinds of atom chemically bonded together.
: A substance made of one type of atom
: Multiple atoms chemically bonded together.
: The smallest particle of an element