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Elements Compounds and Mixtures

Elements Compounds and Mixtures. Element, mixture or compound?. Salty water. Hydrogen. Hydrochloric acid. Air. Diamond. Sodium chloride (salt). Is it an element, compound or mixture?. Scientists like to classify things . One way that scientists classify matter is by its composition.

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Elements Compounds and Mixtures

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  1. Elements Compounds and Mixtures

  2. Element, mixture or compound? Salty water Hydrogen Hydrochloric acid Air Diamond Sodium chloride (salt)

  3. Is it an element, compound or mixture? • Scientists like to classify things. • One way that scientists classify matter is by its composition. • Ultimately, all matter can be classified as mixtures, elements and compounds.

  4. Why isn’t it a good idea to classify matter by its state? • Because one kind of substance can exist in more than one state – such as H20. And matter changes phases rather easily. • Remember Topic 3 – The World of Chemistry

  5. What is an element? • An element is a pure substance that cannot be broken down into simpler substances. • A pure substance is a substance in which there is only one type of particle. • An element is a chemical that contains only one type of atom. • Pure gold is an element because it contains gold atoms only.

  6. All the elements are found on the

  7. What are atoms? • All chemicals are examples of matter. • All matter is made up of extremely small particles called atoms. • Learn more about atoms in LO 4

  8. What are compounds? Sodium chloride (salt) Methane Glucose A compound is a substance that contains different elements (different atom types) chemically joined together Here are some examples:

  9. Compounds • A compound is a pure substance composed of two or more elements that are chemically joined together. • Compounds are new substances produced by chemical reactions. To be chemically combined, the elements in the compound need to have reacted with one another. • Most elements are not found alone in nature, but rather combined with other elements. Most substances you encounter are compounds! • A compound has fixed proportions of the different elements. Eg. water

  10. C6H12O6 Glucose is a compound Containing the elements: Carbon Hydrogen oxygen

  11. What are molecules? Oxygen molecules • Molecules are groups of atoms joined together. • The compound water is a molecule containing 2 hydrogen atoms joined to an oxygen atom. • The element oxygen forms molecules of oxygen gas = O2

  12. Mixtures • A mixture is a combination of two or more substances that are not chemically combined. • When you mix up chemicals and no new substance is produced then a mixture is formed. • Substances in a mixture retain their identity, they do not change into something else. • Mixtures can be physically separated through physical change. Eg: picking the pecans out of pecan pie, boiling salt water to evaporate the water and leave the salt.

  13. Air 1% 0.03% Air is a mixture…which can be separated – see LO 8 21% 18% 79% 79%

  14. Classification of Matter Overview

  15. Test yourself Is it an element, compound or mixture?

  16. One Element The Same Element (Gas) (Solid)

  17. Another element A mixture of two elements This one likes to go round in pairs as a gas (molecules)

  18. This is not a mixture, it is a COMPOUND of two different elements This is just a mixture of two elements

  19. Element, Compound or Mixture ?

  20. Element, Compound or Mixture ? Element

  21. Element, Compound or Mixture ?

  22. Element, Compound or Mixture ? Element

  23. Element, Compound or Mixture ?

  24. Element, Compound or Mixture ? Mixture

  25. Element, Compound or Mixture ?

  26. Element, Compound or Mixture ? Compound

  27. Element, Compound or Mixture ?

  28. Element, Compound or Mixture ? Compound

  29. Element, Compound or Mixture ?

  30. Element, Compound or Mixture ? A mixture of a compound and an element

  31. What do we call these things? 6 Atoms which happen to be of 3 different elements

  32. What do we call these things? A Molecule Yes, it also happens to be 2 atoms joined together but we don’t call it “2 atoms joined together” we say it is one molecule

  33. What do we call these things? A Molecule of a compound 2 molecules of a compound

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