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Understanding Matter: Elements and Compounds

Learn how to classify matter into elements, compounds, and mixtures. Understand the properties of pure substances and differentiate between elements and compounds through experiments. Master the essentials of chemistry classification.

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Understanding Matter: Elements and Compounds

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  1. Compounds And Elements Objectives: 3.3 Describe a pure substance as a compound or an element, after conducting an experiment. 3.4 Analyze a compound.

  2. Classification: • Everything in the world that has a mass is called “matter” • Matter can be classified as: Matter Pure Substance Mixture Element Ex. gold Compound Ex. water Hetero-geneous Mixture Homo-geneous Mixture

  3. Matter: • anything that takes up space & has a mass • Ex. a desk • Ex. pizza • Ex. silver necklace • Ex. oxygen

  4. Pure Substance: • composed of a single substance with the same properties throughout • Ex. water • Ex. table salt • Mixture: • combinations of two or more substances that are not chemically combined (mixed) • Easily separated • Ex. fruit salad • Ex. sugar in coffee

  5. A pure substance can be further broken down into an element or a compound…… Elements: • simplest form of matter • cannot be separated or broken down into simpler substance • Ex. Oxygen • Ex. Aluminum • Ex. Gold • Ex. Copper

  6. Recall, a pure substance can be further broken down into an element or a compound Compounds: • substance made of two or more elements • can be separated into simpler substance • Ex. Water (H2O) • Ex. Carbon dioxide (CO2) • Ex. Sugar (C6H12O6) • Ex. Salt (NaCl)

  7. NOTE: With chemical reactions you can go from an element to compound & vise versa!!! Element Compound Ex. oxygen & hydrogen Ex. water (H2O) O O H H H H

  8. Ex #1 State whether the following are examples of an element or a compound. A gold ring element Rust (Fe2O3) compound Carbon monoxide (CO) compound Aluminum Foil element element Calcium

  9. Ex #2 State whether the following are examples of an element or a compound or a mixture A blueberry muffin mixture Chunky Soup mixture Salt (NaCl) compound Helium element compound Water (H2O)

  10. Ex #3 State whether the following pictures represent an element or a compound or a mixture Compound Compound Element Mixture

  11. Ex #4 Which statement best describes a compound. A) A pure substance that has a high melting point. B) A mixture that is formed by two or more elements. C ) A pure substance that is formed by two or more elements.

  12. Key Points to Remember • Mixture: • 2 or more components brought together that can be separated physically • Pure Substance • A single substance with the same properties throughout • Element • Simplest form of matter that can not be broken down • Compound • 2 or more elements chemically combined

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