2 S8P1- b Pure Substances and Mixtures Essential Questions:Are pure substances and mixtures BOTH examples of matter?How are pure substances and mixtures alike? How are they different?Classify as either a pure substance or a mixture: compound, element, homogenous, heterogeneous.
3 Matter Matter is separated into two main classes: Mixtures- where particles are differentHomogenous- looks the same (salt water)Heterogeneous- looks different (candy mix)Pure substances- where all particles are alikeExample, elements and compounds
6 Elements Pure substance consists of only one kind of atom, cannot be broken down into a simpler type of matter by either physical or chemical means, andcan exist as either atoms (e.g. argon)or molecules (e.g., nitrogen).
7 ElementsA molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together.Note that the two nitrogen atoms which comprise a nitrogen molecule move as a unit.
9 Compoundsconsists of atoms of two or more different elements bound together,can be broken down into a simpler type of matter (elements) by chemical means (but not by physical means)
10 Compoundshas properties that are different from its component elementsalways contains the same ratio of its component atoms.Microscopic view of the molecules of the compound water (gas phase). Oxygen atoms are red and hydrogen atoms are white.
12 MixturesHeterogeneous- particles look different
13 Mixtures Homogenous- particles look the same throughout Example: salt water
14 Mixturesconsists of two or more different elements and/or compounds physically intermingledcan be separated into its components by physical meansoften retains many of the properties of its components.
15 MixturesMicroscopic view of a gaseous mixture containing two elements (argon and nitrogen) and a compound (water).