C1 Flashcards
What is an atom?
The smallest part of an element that can exist. All substances are made of atoms. No overall electrical charge. Very small, radius of 0.1m.
What is an element?
An element contains only one type of atom. Found on the Periodic Table. There are about 100 elements.
What is a compound?
Two or more elements chemically bonded with each other. Can only be separated into the elements through chemical reactions.
What is a mixture?
Contains two or more elements or compounds not chemically bonded. Can be separated using physical methods e.g. by filtration, crystallisation, distillation and chromatography.
What is filtration?
A process that separates mixtures of insoluble solids and liquids.
What is crystallisation?
A process that separates dissolved solids from liquids by evaporating the liquid to leave crystals.
What is distillation?
A process that separates a mixture of liquids based on their boiling points.
What is chromatography?
A process that separates mixtures by how quickly they move through a stationary phase (e.g. paper).
What is an isotope?
An atom of the same element with different numbers of neutrons.
What is relative atomic mass?
An average value of mass that takes account of the abundance of the isotopes of the element.
