C1 - atomic structure Flashcards
What is an element
A substance made of only one type of atom
What is a compound
A substance made of multiple chemically bonded atoms
What is a molecule
A substance that contains more than one atom
What is a mixture
A mixture of atoms or molecules not chemically bonded
Law of conservation of mass
Mass cannot be created or destroyed
What is a solution
A liquid with one substance dissolved in another
What is a solute
A solid dissolved in a solution
What is a solvent
A liquid that dissolves a solute
What is filtration
Separating substances by particle size
What is crystalisation
Heating a solution to evaporate the solvent and leave the solid solute
What is distillation
Separating a liquid from a soluble solid by evaporating and collecting it
What is fractional distillation
Separating a two dissolved liquids by boiling point (miscible liquids)
What is chromatography
Separating mixtures into their components by solubility in a mobile phase
History of atom list all people and what they discovered in order
Democritus - atoms aren’t divisible
John Dalton - atoms aren’t divisible
JJ Thomson - electrons, plum pudding
Rutherford - gold foil experiment, nucleus
Niels Bohr - shells
James Chadwick - neutrons
What is an isotope
An atom with a different number of neutrons