1. Unit 1: Matter & Measurement Section 8: Elements, Compounds, & Mixtures

2. salt, baking soda, sugar, water oxygen, iron, hydrogen, gold Matter Mixture Pure Substance ElementsCompounds Heterogeneous Mixture Homogeneous Mixture separate physically cannot separate physically different uniform separate chemically cannot separate Chemical changes Physical changes (solutions) filtering distillation (boiling) (suspensions/colloids)

3. Pure Substances Element: only one type of atom simplest form of matter retaining its properties Examples: Carbon (C) Helium (He) Gold (Au) (cannot be separated)(chemically or physically)

4. Pure Substances Compound: two or more elements chemically bonded together Examples: Carbon Dioxide (CO 2 ) Water (H 2 O) Salt (NaCl) Sucrose (C 12 H 22 O 11 ) (can be separated…chemically)

5. Sodium is a highly reactive metal stored in oil. Cl 2 (element) Chlorine kills organisms in pools. It’s also a poisonous green gas. completely new substance with completely new properties NaCl (compound) Na (element)

6. Compound: can be separated…chemically into… H 2 O (liquid) O 2 (gas) H 2 (gas) Hoffman apparatus elements …which can…NOT.

7. Mixtures Homogeneous Mixture: physically mixed evenly… it looks the same throughout lemonade Steel (Fe + C + Cr) NaCl + H 2 O  salt water distillation (boiling) (solutions) physically separated by _____________. Examples: Copper (Cu) and Zinc (Zn) make brass.

8. Mixtures Heterogeneous Mixture: physically mixed unevenly…can see the different parts Examples: Sand Granite Wood

9. Suspensions: large particles settle due to gravity Heterogeneous Mixtures physically separated by _____________ filtration Examples: dusty air muddy water precipitates (solids from liquid)

10. Separation (Group Discussion) Sand + Iron (Fe) + Salt (NaCl) is a(n) ______________________ that can be separated by … heterogeneous mixture Physically: -pulling out Fe with magnet Physically: -dissolving NaCl in water -filtering sand out -evaporating the water Chemically: -decomposing NaCl with electricity into Na and Cl

11. 1.Passing an electric current through a substance produces oxygen and sulfur. This substance cannot be a(n) A. compound. B. mixture. C. element. D. solution. Quick Quiz!

12. Quick Quiz. 2.Which of the following is a mixture? A. sodium chloride (NaCl) B. carbon dioxide (CO 2 ) C. sucrose (sugar, C 11 H 22 O 11 ) D. air (N 2, O 2, CO 2, H 2, Ar, …)

13. Quick Quiz. 3.A blue-green solid is decomposed by heating. A colorless gas and a black solid appear. The blue-green solid must have been a(n) A. heterogeneous mixture B. homogeneous mixture C. compound D. element +

14. salt, baking soda, sugar, water oxygen, iron, hydrogen, gold Matter _______ _____ Substance __________________ ______geneous Mixture _____geneous Mixture separate physically ________ separate physically _________ _______ separate chemically cannot separate ________ changes ________ changes (________) filtering distillation (boiling) (suspensions/colloids)