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Elements, Compounds & Mixtures

Discover the differences between elements, compounds, and mixtures in chemistry. Learn about their properties and types such as solutions, suspensions, and colloids.

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Elements, Compounds & Mixtures

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  1. Elements, Compounds& Mixtures

  2. Elements • An element is a pure substance (only 1 type of particle) that cannot be separated into simpler substances by physical or chemical means. • http://www.privatehand.com/flash/elements.html

  3. Element

  4. Compounds • A compound is a pure substance composed of 2 or more elements that are chemically combined.

  5. Examples of Compounds • Compounds contain elements • The elements combine + lose their original properties • Compounds CAN be separated by chemical means • The elements combine in specific ratios Sodium (Na) + Chlorine (Cl) NaCl Hydrogen (H) + Oxygen (O) H2O Carbon (C) + Oxygen (O) CO2

  6. Mixtures • A mixture is a combination of 2 or more substances that are not chemically combined.

  7. Examples of Mixtures chicken noodle soup salad pizza – yes, that would be Yoda… Properties of Mixtures: • Each substance in a mixture keeps its identity • You can physically separate them • They also contain elements, compounds, or both • And they can be formed using any ratio of • components

  8. Mixtures may be homogeneous orheterogeneous • The prefix “homo” indicates the same • Homogeneous mixtures have the same appearance and properties throughout the mixture • The prefix “hetero” indicates difference • Heterogeneous mixtures consist of visibly different substances

  9. Types of Mixtures • There are THREE types of mixtures: • Solutions • Suspensions • Colloids

  10. Solutions • A solution is a mixture that appears to be a single substance, but it is actually composed of 2 or more substances that are distributed evenly amongst each other. • SOLUTIONS ARE HOMOGENEOUS sugar & Kool-Aid powder are dissolved in water salt is dissolved in water carbon dioxide is dissolved in water

  11. Suspensions • A suspension is a mixture in which particles of a material are dispersed throughout a liquid or gas, but are large enough that they settle out. • SUSPENSIONS ARE HETEROGENEOUS That water is disgusting! muddy water Italian dressing

  12. Colloids • A colloid is a mixture in which the particles are dispersed throughout but are not heavy enough to settle out. • COLLOIDS ARE HOMOGENEOUS Colloids have properties of both solutions & suspensions. mayonnaise milk

  13. Comparing Elements, Compounds & Mixtures

  14. Identify the following with as many terms as apply • Table salt • Salad • Mayonnaise • Italian dressing • Pepsi • Oxygen • Hydrogen • Water Mixture Element Compound Suspension Colloid Solution Homogeneous Heterogeneous

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