Presentation on theme: "18.1 – Composition of Matter"— Presentation transcript:
1 18.1 – Composition of Matter Chapter 1818.1 – Composition of Matter
2 Objectives Define pure substances and mixtures. Identify elements and compounds.Compare and contrast solutions, colloids, and suspensions.
3 Pure Substances Type of matter with a fixed composition Can be element or compoundElement = pure substance in which all atoms have the same identity90 elements found on Earth20+ have been made in labsMost are unstable and exist for a short period of time
5 Pure substanceCompounds = when 2 or more different elements combine in a fixed proportionWater, Table Salt (NaCl)Molecules = particle consisting of 2 or more atoms bound together
6 MixturesMaterial made up of 2 or more substances that can be easily separated by physical meansHeterogeneous mixtures = mixture in which different materials can be easily distinguishedGranite, Concrete, Pasta Salad, Clothing
7 MixturesHomogeneous mixture = 2 or more substances blended evenly throughoutSoft drinks, Pudding, VinegarSolution = particles so small that they cannot be seen with microscope and will never settle to the bottom of their container