C2.1

• Relative atomic mass is the mean mass of an atom of an element compared to 1/12 of a carbon-12
• the chemical formula tells you how many atoms of each element there are in a unit of substance
• relative formula mass are masses of substances made from 2 or more atoms
• empirical formula shows the simplest whole number ration of atoms of elements in a compound
• pure substances consists of only one element / compound
• impure substances consists of more than one element/ compound
• an alloy is a mixture with one or more other elements
• a solution forms when a substance dissolves in another
• a solute is a substance that dissolves
• a solvent is the substance it dissolves in
• soluble is when a substance can dissolve
• insoluble is when a substance can't dissolve
• filtration: it contains filter paper which has tiny holes allowing solvent to pass through, the insoluble substance are too large to pass through the filter paper so it gets left behind as residue