C12.1 Pure substances and water
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What is a pure substance?
A substance made up of just once substance - the substance can be either an element or a compound
What is the test for water?
It turns white anhydrous copper sulfate blue
How can you test for pure substances?
The melting point and boiling points of an element or a compound are called its fixed points and should remain there if its a pure substance
How can you look at the fixed points?
Look it up on databooks or databases
How can you see the differences between mixtures and pure substances?
A mixture does not have a sharp boiling points whilst pure substances have sharp boiling points
What do impurities tend to do?
Lower the melting point of a substance and raise its boiling point
What is a formulation?
Is a mixture that has been designed to produce a useful product
What are some examples of a formulation?
Alloys Fuels Fertilizers Pesticides Cosmetics
What is inside paint?
A pigment to provide color A binder to help the paint attack itself to an object and to form a protective film when dry A solvent to help the pigment and binder spread well during painting by thinning them out
What do washing up liquids usually contain?
A surfactant - the actual detergent that removes the grease Water - to thin out the mixture so it can squire more easily from bottle Colouring and fragrance additives to improve the appeal of the product to potential customers Rinse agent to help water drain off crockery