Seperation Techniques Flashcards
What is a Mixture?
A mixture is a combination of two or more pure substances in which each pure substance retains its individual chemical properties.
What is a pure substance?
Any substance that has a uniform and unchanging composition is considered to be pure. Examples of pure substances include elements.
How can you test if something is pure?
To determine if a substance is pure, we can check the substance’s melting or boiling points or use chromatography
How to carry out Chromatography?
Simple chromatography is carried out on paper. A spot of the mixture is placed near the bottom of a piece of chromatography paper and the paper is then placed upright in a suitable solvent, eg water. As the solvent soaks up the paper, it carries the mixtures with it.
Where is Chromatography useful?
Gas Chromatography is used in airports to detect bombs and is used is forensics in many different ways. It is used to analyze fibers on a persons body and also analyse blood found at a crime scene.
What is a solute?
the minor component in a solution, dissolved in the solvent.
What is a solution?
a liquid mixture in which the minor component (the solute) is uniformly distributed within the major component (the solvent).
What is solubility?
Solubility is the property of a solid, liquid, or gaseous chemical substance called solute to dissolve in a solid, liquid, or gaseous solvent.
What is a solvent?
the liquid in which a solute is dissolved to form a solution.
Define Saturated
A saturated substance is one in which the atoms are linked by single bonds.
How does filtering work?
When a mixture of sand and water is filtered: the sand stays behind in the filter paper (it becomes the residue) the water passes through the filter paper (it becomes the filtrate)
How is filtration useful?
To help to separate two substances from each other for example. When a mixture of sand and water is filtered: the sand stays behind in the filter paper (it becomes the residue) the water passes through the filter paper (it becomes the filtrate)
