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18.1 – Composition of Matter

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1 18.1 – Composition of Matter
Chapter 18 18.1 – 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 compound Element = pure substance in which all atoms have the same identity 90 elements found on Earth 20+ have been made in labs Most are unstable and exist for a short period of time


5 Pure substance Compounds = when 2 or more different elements combine in a fixed proportion Water, Table Salt (NaCl) Molecules = particle consisting of 2 or more atoms bound together

6 Mixtures Material made up of 2 or more substances that can be easily separated by physical means Heterogeneous mixtures = mixture in which different materials can be easily distinguished Granite, Concrete, Pasta Salad, Clothing

7 Mixtures Homogeneous mixture = 2 or more substances blended evenly throughout Soft drinks, Pudding, Vinegar Solution = particles so small that they cannot be seen with microscope and will never settle to the bottom of their container


9 Colloids Mixture with particles that are larger than those in solutions but not heavy enough to settle out Greek word for “glue” Examples: Milk, Gelatin

10 Detecting Colloids Pass light beams through
Solutions = no light comes through Colloids = light readily passes through Tyndall Effect = scattering of light by colloidal particles

11 Suspensions Heterogeneous mixture containing liquid in which particles settle Example: Pond Water

12 In-Class Assignment/Homework
18.1 Reinforcement & Enrichment WKT Reinforcement #10-15 use p. 553 Enrichment – complete like examples Pond Water = Mixture  heterogeneous  suspension Potassium fluoride = substance  compound Carbon = Substance  element

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