Compound Properties. D. Crowley, 2007. Compound Properties. To understand compounds have different properties to the elements they contain. Formula. Assessed worksheet - complete the model for the formula (the model is a simple way to represent something difficult)
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Compound Properties D. Crowley, 2007
Compound Properties • To understand compounds have different properties to the elements they contain
Formula • Assessed worksheet - complete the model for the formula (the model is a simple way to represent something difficult) • You need to add the symbol equation • You need to add a description of the element / compound • You need to add the model representation
Formula Fill in the table, using a written explanation and a drawn model, using the symbols below Remember: a model is just a way of simplifying something which is difficult to understand You will be assessed on your understanding of elements and compounds; and you ability to use models to help you explain elements and compounds… Hydrogen (H) Carbon (C) Potassium (K) Oxygen (O) Sulphur (S) Nitrogen (N) Chlorine (Cl) Sodium (Na) Calcium (Ca)
Experiment • You are going to heat two elements - iron and sulphur • You need to decide if you have produced a mixture or a compound Compound Compound Mixture Mixture
Iron & Sulphur • Firstly note some of the key properties of the iron and sulphur in your book - colour; magnetic; state etc… • Once you have done this, you are ready to carry out the experiment…
Experiment • Mix a small quantity of iron and sulphur together in a boiling tube • Heat gently, and observe what happens • Once you’ve completed this, wait for the boiling tube to cool, and test for common properties of your mixture / compound • Which is it?!
Iron Sulphide • You have produced a new compound • In your own words, explain how you know this • Can you add a word and symbol equation?
Iron sulphide • Iron and sulphur react to form a new compound, iron sulphide • Iron is grey and magnetic, and sulphur is yellow and not magnetic • Iron sulphide is black, and is not magnetic
Equations Iron + sulphur iron sulphide Fe + S FeS
Acid • Finally, add some dilute acid to the iron sulphide - is there a reaction? • What has been produced?
Acid • The iron sulphide has reacted with the acid, forming smelly hydrogen sulphide iron sulphide + sulphuric acid iron sulphate + hydrogen sulphide FeS + H2SO4FeSO4 + H2S iron sulphide + hydrochloric acid iron chloride + hydrogen sulphide FeS + 2HClFeCl2 + H2S