Science Junior Cert

Question Answer
What consists of two or more different substances mingled together but not chemically combined A mixture
Name two examples of a mixture Air, Seawater
Are mixtures, easy or difficult to separate Easy
Are Compounds easy or difficult to separate Difficult
How many substances make up a mixture two or more
How many substances are present in a compound One
Are the properties of a compound very different to the properties of the elements they are made up of Yes
What do you call a change where nothing new is made Physical change
What do you call a change where something new is made Chemical change
Nitrogen, oxygen, carbon dioxide and water vapour are all present in what mixture Air
What is the name of the method used to separate insoluble solids from a liquid e.g sand and water Filtration
What is the name of the method used to separate soluble soilds from a solution e.g salt in water Evaporation
What is the name of the method used to separate a mixture of dissolved subctances in a solution e.g inks in a dye Chromatography
What is the name of the method used to separate two liquids with different boiling points e.g. alcohol and water Distillation
What is the name given to the condensor used in distillation Liebig Condensor
How would you separate iron filings and wood shavings Use a magnet
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