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Understanding Pure Substances and Mixtures

Explore the definitions and characteristics of elements, compounds, and mixtures. Learn how pure substances consist of only one type of particle, while mixtures involve two or more substances not chemically bonded. Discover the differences between heterogeneous and homogeneous mixtures.

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Understanding Pure Substances and Mixtures

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  1. Elements, Compounds, and Mixtures

  2. What is a PURE SUBSTANCE? • Pure substances are made of only one type of particle.

  3. What is an ELEMENT? • A substance composed of a single kind of atom. • Cannot be broken down into another substance by chemical or physical means.

  4. What is an ELEMENT? • Elements are considered pure substances • Pure substances are made of only one type of particle.

  5. What is a COMPOUND? • A substance in which two or more different elements are CHEMICALLY bonded together.

  6. What is a COMPOUND? • Compounds are also PURE SUBSTANCES because they are made of only one type of molecule.

  7. How can you separate a COMPOUND? • To separate the components of a COMPOUND, you would have to use chemical changes (like passing electricity through water to break it into hydrogen and oxygen.)

  8. What is a MIXTURE? • Two or more substances that are mixed together but are NOT chemically bonded.

  9. What is a MIXTURE? • Mixtures are NOT considered pure substances because they are made up of 2 or more types of particles or molecules.

  10. MIXTURES – Heterogeneous vs Homogeneous • HETEROGENEOUS means a mixture that does not have a uniform composition. • EX: a bowl of cereal and milk • HOMOGENEOUS means a mixture in which substances are evenly spread out. • EX: a cup of tea has water molecules, tea, and sugar spread evenly throughout.

  11. What is a SUSPENSION? • A heterogeneous mixture in which particles of a material are spread throughout a liquid or gas but are too large to stay mixed without being shaken or stirred up. • EX: salad dressing

  12. What is a SOLUTION? • A homogeneous mixture in which one substance is dissolved into another substance. • EX: Koolaid (solution of water, koolaid powder and sugar).

  13. What is a COLLOID? • A mixture that falls somewhere between a solution and a suspension. • Particles are spread throughout a liquid or gas (like a suspension) • Particles are too small to settle out quickly. • Colloids look homogeneous but are actually considered heterogeneous. • EX: jello

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