1. Elements Compounds and Mixtures
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Elements Compounds and Mixtures

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

3. Is it an element, compound or mixture?
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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?
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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. 06/04/2017
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
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All the elements are found on the

7. What are atoms? All chemicals are examples of matter.
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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 1

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

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

11. What are molecules? Molecules are groups of atoms joined together.
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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 = O2
Oxygen molecules 1

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

14. Classification of Matter Overview
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Classification of Matter Overview

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

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One Element
The Same Element
(Gas)
(Solid)

17. A mixture of two elements
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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
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This is just a mixture of two elements

19. Element, Compound or Mixture ?
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Element, Compound or Mixture ?

20. Element, Compound or Mixture ?
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Element, Compound or Mixture ?
Element

21. Element, Compound or Mixture ?
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Element, Compound or Mixture ?

22. Element, Compound or Mixture ?
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Element, Compound or Mixture ?
Element

23. Element, Compound or Mixture ?
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Element, Compound or Mixture ?

24. Element, Compound or Mixture ?
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Element, Compound or Mixture ?
Mixture

25. Element, Compound or Mixture ?
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Element, Compound or Mixture ?

26. Element, Compound or Mixture ?
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Element, Compound or Mixture ?
Compound

27. Element, Compound or Mixture ?
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Element, Compound or Mixture ?

28. Element, Compound or Mixture ?
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Element, Compound or Mixture ?
Compound

29. Element, Compound or Mixture ?
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Element, Compound or Mixture ?

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

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

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