Difference between revisions of "Pure"
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: The opposite of a [[pure]] [[substance]] would be a [[mixture]] of [[substance]]s. | : The opposite of a [[pure]] [[substance]] would be a [[mixture]] of [[substance]]s. | ||
: A [[substance]] can be [[pure]] because it is made of only one [[element]] or it can be [[pure]] because it is made of only one [[compound]]. | : A [[substance]] can be [[pure]] because it is made of only one [[element]] or it can be [[pure]] because it is made of only one [[compound]]. | ||
| + | : The word [[pure]] is often used in food adverts to mean there is only one ingredient, eg [[pure]] orange juice contains only oranges, but most people confuse it for meaning something that is healthy, natural or good. Be careful not to confuse this for the real meaning of [[pure]]. | ||
===Examples=== | ===Examples=== | ||
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| style="height:20px; width:200px; text-align:center;" |[[Pure]] [[Carbon Dioxide]] is a [[gas]] made of only [[Carbon Dioxide]] [[molecule]]s. | | style="height:20px; width:200px; text-align:center;" |[[Pure]] [[Carbon Dioxide]] is a [[gas]] made of only [[Carbon Dioxide]] [[molecule]]s. | ||
|} | |} | ||
| + | |||
| + | ==Key Stage 4== | ||
| + | ===Meaning=== | ||
| + | A [[pure]] [[substance]] is one that contains only one type of [[chemical]]. | ||
| + | |||
| + | ===About Purity=== | ||
| + | : [[Pure]] does NOT mean good, healthy or natural. | ||
| + | '''Purity''' may refer to: | ||
| + | *A '''pure''' [[element]] - A [[substance]] containing only one type of [[atom]]. | ||
| + | *A '''pure''' [[compound]] - A [[substance]] containing only one [[chemical]] [[compound]]. | ||
| + | |||
| + | : '''Purity''' is important for ensuring that when [[Chemical Reaction|reaction]]s take place there are no unwanted [[product]]s caused by the '''impurities'''. | ||
| + | : '''Impurities''' can change the [[property|properties]] of a [[substance]] such as its [[Melting Point|melting point]], [[Electrical Conductivity|electrical conductivity]] or [[Strength (Property)|strength]]. This means '''purity''' is essential when using [[substance]]s for certain [[application]]s where those [[property|properties]] important. | ||
Revision as of 21:49, 19 January 2019
Contents
Key Stage 3
Meaning
A pure substance is one that contains only one type of chemical.
About Pure Substances
- The opposite of a pure substance would be a mixture of substances.
- A substance can be pure because it is made of only one element or it can be pure because it is made of only one compound.
- The word pure is often used in food adverts to mean there is only one ingredient, eg pure orange juice contains only oranges, but most people confuse it for meaning something that is healthy, natural or good. Be careful not to confuse this for the real meaning of pure.
Examples
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| Pure Gold is a solid made of only Gold atoms. | Pure Mercury is a Liquid made of only Mercury atoms. | Pure Oxygen is a gas made of only Oxygen atoms. |
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| Pure Magnesium Oxide is a solid made of only the compound Magnesium Oxide | Pure water is a liquid made of only the compound H2O. | Pure Carbon Dioxide is a gas made of only Carbon Dioxide molecules. |
Key Stage 4
Meaning
A pure substance is one that contains only one type of chemical.
About Purity
- Pure does NOT mean good, healthy or natural.
Purity may refer to:
- A pure element - A substance containing only one type of atom.
- A pure compound - A substance containing only one chemical compound.
- Purity is important for ensuring that when reactions take place there are no unwanted products caused by the impurities.
- Impurities can change the properties of a substance such as its melting point, electrical conductivity or strength. This means purity is essential when using substances for certain applications where those properties important.