a group of 2 or more atoms that are held together by chemical bonds (e.g. oxygen). molecules can contain multiple different elements
what is a compound?
substances that contain 2 or more different elements. the atoms are held together by chemical bonds. lots of molecules can also be compounds. molecules that only contain 1 type of element arent compounds.
what are mixtures?
two or more substances that are not chemically combined together. they are different substances that haven't reacted together. they are easily separated using filtration, crystallisation or distillation
