Chapter 2 Matter and Change . 2.2 Mixtures 2.1 Properties of Matter 2.3 Elements and Compounds 2.4 Chemical Reactions Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. .

5.0 grams of pure gold has a density of 19.32 g/cm3. Describing Matter Do Now: 5.0 grams of pure gold has a density of 19.32 g/cm3. What is the density of a 15 gram sample of pure gold? What is the mass of exactly one half of the 5g sample of pure gold? Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. .

What is matter made up of? There is a key difference between elements Elements Simplest form of matter that has a unique set of properties Examples: O - Oxygen H - Hydrogen Cu - Copper

The Periodic Table

Symbols and Latin Names for Some Elements Sodium Na natrium Potassium K kalium Antimony Sb stibium Copper Cu cuprum Gold Au aurum Silver Ag argentum Iron Fe ferrum Lead Pb plumbum Tin Sn stannum

What is matter made up of? There is a key difference between elements Elements Compounds Simplest form of matter that has a unique set of properties Examples: O - Oxygen H - Hydrogen Cu - Copper Substance that contains 2 or more elements chemically combined in a fixed proportion. Examples: H2O - Water C12H22O11 - Sucrose CO2 – Carbon Dioxide

There is a key difference between elements Chemical Formulas Distinguishing Elements and Compounds There is a key difference between elements Chemical Formulas Represent compounds Subscripts tell you how many of each element are in a compound Examples: Table Salt: NaCl https://www.youtube.com/watch?v=NTFBXJ3Zd_4 Ammonia: NH3

There is a key difference between elements and compounds. Distinguishing Elements and Compounds There is a key difference between elements and compounds. Compounds can be broken down into simpler substances by chemical means, but elements cannot. https://www.youtube.com/watch?v=Uy0m7jnyv6U

Matter Classification Has mass and takes up space Mixture Substance Physical blend of 2 or more substances, not chemically combined Uniform and definite composition Homogeneous Mixture Heterogeneous Mixture Element Compound

Substance - Matter that has a uniform and definite composition Describing Matter Substance - Matter that has a uniform and definite composition Mixture: physical blend of two or more substances that are not chemically combined Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. .

Heterogeneous Mixture Homogeneous Mixture Describing Matter Heterogeneous Mixture Homogeneous Mixture Composition is NOT uniform throughout Examples: Salad Chocolate Chip Cookie Chicken Noodle Soup Composition is uniform throughout Also called a solution. Examples: Air Steel Vinegar Salt Water Milk Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. .

Read Separating a Mixture of Elements and Compounds Lab. Describing Matter Do Now: Read Separating a Mixture of Elements and Compounds Lab. Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. .

Differences in physical properties can be used to separate mixtures. Separating Mixtures Separating Mixtures Differences in physical properties can be used to separate mixtures. Examples: Filtration Distillation Magnetism https://www.youtube.com/watch?v=ZE_Rs52Ijv4 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. .

Separates solids from a liquid in a heterogeneous mixture. Separating Mixtures Filtration Separates solids from a liquid in a heterogeneous mixture. Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. .

Distillation Separating Mixtures Process which separates mixtures of liquids with different boiling points. Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. .

END OF 2.2 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. .