Classifying Matter Elements Compounds and Mixtures Charbonneau 2012
Classifying Matter: Elements, Compounds, and Mixtures Charbonneau 2012
Pure Substances �A sample of matter that has definite chemical and physical properties.
Elements �pure substance that cannot be separated into simpler substance by physical or chemical means.
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
Mixtures �A combination of two or more pure substances that are not chemically combined. �substances held together by physical forces, not chemical �No color, gas or heat change takes place �Each item retains its properties in the mixture �They can be separated physically Chem 4 kids. com
One Element The Same Element (Gas) (Solid)
Another element This one likes to go round in pairs as a gas (molecules) A mixture of two elements
This is not a mixture, it is a COMPOUND of two different elements This is just a mixture of two elements
Element, Compound or Mixture ?
Element, Compound or Mixture ? Element
Element, Compound or Mixture ?
Element, Compound or Mixture ? Element
Element, Compound or Mixture ?
Element, Compound or Mixture ? Mixture
Element, Compound or Mixture ?
Element, Compound or Mixture ? Mixture
Element, Compound or Mixture ?
Element, Compound or Mixture ? Compound
Element, Compound or Mixture ?
Element, Compound or Mixture ? Compound
Element, Compound or Mixture ?
Element, Compound or Mixture ? A mixture of a compound an element
What do we call these things? An Atom 3 Atoms
What do we call these things? 6 Atoms which happen to be of 3 different elements
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
What do we call these things? A Molecule of a compound 2 molecules of a compound
What about when all the atoms are stuck together like in a solid element?
This is just a load of atoms in a solid element, it is not a big molecule
Finally, just to confuse you even more, science teachers like talking about Particles Particle is just a fancy name for individual things. These individual things could be atoms, molecules, lumps of soil, grains of sand, bits of metal. It doesn’t matter because particle is just a general word which is used when we don’t (or can’t) want to be exact about the type of things being described.
A good example of when science teachers use the word particle is when talking about air. Air is a mixture of elements such as oxygen, argon and nitrogen mixed with compounds such as carbon dioxide
Some of the elements in air go around as single atoms (such as argon). Or as molecules such as oxygen. Compounds go around as molecules.
That’s why we talk about particles because it saves the bother of describing exactly what sort of things they are.
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.
Element, Compound, or Mixture? Rocks
Element, Compound, or Mixture? Rocks
Element, Compound, or Mixture? Copper
Element, Compound, or Mixture? Copper
Element, Compound, or Mixture? Jelly Beans
Element, Compound, or Mixture? Jelly Beans
Element, Compound, or Mixture? Table Sugar
Element, Compound, or Mixture? Table Sugar
Element, Compound, or Mixture? Diamond
Element, Compound, or Mixture? Diamond
Element, Compound, or Mixture? Tea
Element, Compound, or Mixture? Tea
Element, Compound, or Mixture? Salt
Element, Compound, or Mixture? Salt
Element, Compound, or Mixture? Neon Gas
Element, Compound, or Mixture? Neon Gas
Element, Compound, or Mixture? Salad
Element, Compound, or Mixture? Salad
Element, Compound, or Mixture? Pure Water
Element, Compound, or Mixture? Pure Water
Element, Compound, or Mixture? Aluminum
Element, Compound, or Mixture? Aluminum
Element, Compound, or Mixture? Lemonade
Element, Compound, or Mixture? Lemonade
Element, Compound, or Mixture? Silver
Element, Compound, or Mixture? Silver
Element, Compound, or Mixture? Sand
Element, Compound, or Mixture? Sand
Notes �Detailed notes are located at: http: //www. middleschoolscience. com/elementscompounds-mixtures-notes-isn. pdf �Flow Chart: http: //www. middleschoolscience. com/matter-flow-chartisn. pdf
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