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01/09/2014 Elements Compounds and Mixtures. 01/09/2014 Element, mixture or compound? Salty waterHydrogen Hydrochloric acid Sodium chloride (salt) Diamond.

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Presentation on theme: "01/09/2014 Elements Compounds and Mixtures. 01/09/2014 Element, mixture or compound? Salty waterHydrogen Hydrochloric acid Sodium chloride (salt) Diamond."— Presentation transcript:

1 01/09/2014 Elements Compounds and Mixtures

2 01/09/2014 Element, mixture or compound? Salty waterHydrogen Hydrochloric acid Sodium chloride (salt) Diamond Air

3 01/09/2014 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 01/09/2014 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 H 2 0. And matter changes phases rather easily. Remember Topic 3 – The World of Chemistry

5 01/09/2014 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 01/09/2014 All the elements are found on the

7 01/09/2014 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 01/09/2014 What are compounds? A compound is a substance that contains different elements (different atom types) chemically joined together Here are some examples: Glucose Methane Sodium chloride (salt)

9 01/09/2014Compounds 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 01/09/2014 Glucose is a compound Containing the elements: Carbon Hydrogen oxygen C 6 H 12 O 6

11 01/09/2014 What are 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 = O 2 Oxygen molecules

12 01/09/2014Mixtures 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 01/09/2014Air Air is a mixture…which can be separated – see LO 8 79% 21%18% 0.03% 1%

14 01/09/2014 Classification of Matter Overview

15 01/09/2014 Test yourself Is it an element, compound or mixture?

16 01/09/2014 (Gas) One Element The Same Element (Solid)

17 01/09/2014 This one likes to go round in pairs as a gas (molecules) Another element A mixture of two elements

18 01/09/2014 This is not a mixture, it is a COMPOUND of two different elements This is just a mixture of two elements

19 01/09/2014 Element, Compound or Mixture ?

20 01/09/2014 Element, Compound or Mixture ? Element

21 01/09/2014 Element, Compound or Mixture ?

22 01/09/2014 Element, Compound or Mixture ? Element

23 01/09/2014 Element, Compound or Mixture ?

24 01/09/2014 Element, Compound or Mixture ? Mixture

25 01/09/2014 Element, Compound or Mixture ?

26 01/09/2014 Element, Compound or Mixture ? Compound

27 01/09/2014 Element, Compound or Mixture ?

28 01/09/2014 Element, Compound or Mixture ? Compound

29 01/09/2014 Element, Compound or Mixture ?

30 01/09/2014 Element, Compound or Mixture ? A mixture of a compound and an element

31 01/09/2014 What do we call these things? 6 Atoms which happen to be of 3 different elements

32 01/09/2014 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 01/09/2014 What do we call these things? A Molecule of a compound 2 molecules of a compound


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