Classifying Matter: Elements, Compounds, and Mixtures

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Classifying MatterElements, Compounds, and
Mixtures
Click on box for video on Elements, Compounds and
Mixtures
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Pure Substances

• A sample of matter that has definite chemical and
  physical properties. A pure substance can be an
  element or a compound.

Compounds
Elements
Atoms
Molecules
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Elements

• pure substance that cannot be separated into
  simpler substance by physical or chemical means.
  The smallest piece of the element is called an
  atom.

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These are elements!
Atoms of same element
Molecules of same element
Hydrogen gas element
copper element
helium element
ozone
sodium element
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Consists of only one kind of atom
Elements- Atoms
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Compounds

• Pure substance composed of two or more different
  elements joined by chemical bonds.
• Made of elements in a specific ratio
• that is always the same
• Has a chemical formula
• Can only be separated by
• chemical means, not physically

H2O
NaCl
CO2
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What is a compound?
Qn Is this a compound?
Qn Is this a compound?
Qn Is this a compound?
O
It only contains one type of element.
It only contains one type of element.
O
It is not chemically combined.
H
H
O
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Compounds- Molecules
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Mixtures

• A combination of two or more pure substances that
  are not chemically combined.
• substances held together by physical forces, not
  chemical
• No chemical change takes place
• Each item retains its properties
• in the mixture
• They can be separated physically

Chem4kids.com
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Mixture
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A mixture of 2 elements
A mixture of two elements, e.g. neon (Ne) and
hydrogen (H2)
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A mixture of 1 element and 1 compound
A mixture of one element and one compound, e.g.
hydrogen (H2) and ammonia (NH3)
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A mixture of 2 compounds
A mixture of two compounds, e.g. water vapour
(H2O) and carbon dioxide (CO2)
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Mixtures vs. Compounds
http//www.bbc.co.uk/schools/ks3bitesize/science/c
hemistry/elements_com_mix_6.shtml
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Can you identify the following?

• You will be shown a series of photos. Tell if
  each photo represents an item composed of an
  element, compound, or mixture.
• Review
• An element contains just one type of atom.
• A compound contains two or more different atoms
  joined together.
• A mixture contains two or more different
  substances that are only physically joined
  together, not chemically.
• A mixture can contain both elements and
  compounds.

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Element, Compound, or Mixture?

• Rocks

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Element, Compound, or Mixture?

• Rocks

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Element, Compound, or Mixture?

• Copper

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Element, Compound, or Mixture?

• Copper

Cu
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Element, Compound, or Mixture?

• Jelly Beans

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Element, Compound, or Mixture?

• Jelly Beans

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Element, Compound, or Mixture?

• Table Sugar

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Element, Compound, or Mixture?

• Table Sugar

C12H22O11
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Element, Compound, or Mixture?

• Diamond

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Element, Compound, or Mixture?

• Diamond

C
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Element, Compound, or Mixture?

• Tea

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Element, Compound, or Mixture?

• Tea

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Element, Compound, or Mixture?

• Salt

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Element, Compound, or Mixture?
NaCl

• Salt

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Element, Compound, or Mixture?

• Neon Gas

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Element, Compound, or Mixture?
Ne

• Neon Gas

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Element, Compound, or Mixture?

• Salad

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Element, Compound, or Mixture?

• Salad

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Element, Compound, or Mixture?

• Pure Water

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Element, Compound, or Mixture?

• Pure Water

H2O
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Element, Compound, or Mixture?

• Aluminum

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Element, Compound, or Mixture?

• Aluminum

Al
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Element, Compound, or Mixture?

• Lemonade

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Element, Compound, or Mixture?

• Lemonade

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Element, Compound, or Mixture?

• Silver

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Element, Compound, or Mixture?

• Silver

Ag
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Element, Compound, or Mixture?

• Sand

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Element, Compound, or Mixture?

• Sand

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(No Transcript)
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Create a Venn Diagram on your left side page in
your notebook!
Elements
Compounds
Mixtures
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Notes

• Detailed notes are located at
• http//www.middleschoolscience.com/elements-compou
  nds-mixtures-notes-isn.pdf
• Flow Chart
• http//www.middleschoolscience.com/matter-flow-cha
  rt-isn.pdf