Difference between revisions of "Mixture"
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: [[Mixture]]s can be [[Separating Mixtures|separated]] by non-chemical processes. | : [[Mixture]]s can be [[Separating Mixtures|separated]] by non-chemical processes. | ||
− | === | + | ===Formulations=== |
− | : | + | : A useful [[mixture]] may be referred to as a [[formulation]]. This is a [[mixture]] which combines the useful [[property|properties]] of several [[chemical]]s in the [[mixture]]. |
− | Some | + | Some examples of [[formulation]]s are: |
*Surface Cleaner - Contains bleach to kill [[bacteria]], a fragrance to give it a pleasant smell and a surfactant to emulsify oils. | *Surface Cleaner - Contains bleach to kill [[bacteria]], a fragrance to give it a pleasant smell and a surfactant to emulsify oils. | ||
*Paint - A dye to provide colour and a solvent for it to be spread over a surface. | *Paint - A dye to provide colour and a solvent for it to be spread over a surface. | ||
*Heartburn Relief - A base to neutralise stomach acid, alginic acid to form a layer to protect the lining of the stomach and oesophagus. | *Heartburn Relief - A base to neutralise stomach acid, alginic acid to form a layer to protect the lining of the stomach and oesophagus. |
Revision as of 15:28, 11 June 2019
Contents
Key Stage 2
Meaning
A mixture is when two or more different substances are in the same place or are part of the same object.
About Mixtures
- Many materials are mixtures of different substances.
- Mixtures can usually be separated, but sometimes it is very difficult to do.
- Mixing is reversible change. Once two substances are mixed they can usually be separated again.
Examples
Sea Water | Muddy Puddle | Beach |
Seawater is mixture of salt and water. | This puddle is a mixture of mud and water. | The beach is a mixture of sand and pebbles. |
Key Stage 3
Meaning
A mixture is a substance which contains more than one type of chemical.
About Mixtures
- A mixture can be made of different elements or it can be made of different compounds.
- The different chemicals in a mixture are not chemically bonded with each other.
- Mixtures can be separated without a chemical reaction.
Examples
A mixture of two different elements. | A mixture of two molecular elements. | A mixture of three different elements. |
A mixture of two compounds. | A mixture of a compound and an element. | A mixture of a compound and an element. |
Key Stage 4
Meaning
A mixture is a substance which contains more than one type of chemical.
About Mixtures
- Mixtures can be made of different elements, compounds or both.
- A mixture of metal elements is called an alloy.
- Mixtures can be separated by non-chemical processes.
Formulations
- A useful mixture may be referred to as a formulation. This is a mixture which combines the useful properties of several chemicals in the mixture.
Some examples of formulations are:
- Surface Cleaner - Contains bleach to kill bacteria, a fragrance to give it a pleasant smell and a surfactant to emulsify oils.
- Paint - A dye to provide colour and a solvent for it to be spread over a surface.
- Heartburn Relief - A base to neutralise stomach acid, alginic acid to form a layer to protect the lining of the stomach and oesophagus.