Elements, Compounds and Mixtures By Miss Buicke. Elements Mixture Compounds

What we must know from the syllabus: OC12 Compare the properties of the simple compounds to those of the constituent elements OC13 Compare mixtures and compounds made from the same constituents, OC3 Understand what an element is and recall that all known elements are listed in the Periodic Table; understand what a compound is and what a mixture is; recall that when elements combine to form compounds they may lose their individual properties

Elements: An element is a substance made up of only one type of atom. There are over 100 different elements. Everything on earth is made from these elements. All the known elements are listed in a table called the periodic table. All elements are given symbols to identify them. We must know the name and symbol for the first twenty elements in the periodic table.

All the symbols have either one or two letters in them. The first letter is a capital letter. The second letter is always a small letter. One letter symbols Two letter symbols

Compounds: Compounds consist of two or more elements chemically combined Very often two or more elements from the periodic table join together and from new substances. These new substances are called compounds. Water is a compound made up of two elements: hydrogen and oxygen Water molecule

Table salt has the chemical formula NaCl. It is made up of two elements Na and Cl. Chemical structure of sodium chloride Carbon dioxide Co 2 is a compound made up of carbon and oxygen.

Mixtures: Mixtures are made up of two or more substances mingled together but not chemically combined. Therefore mixtures can be made up of elements or compounds but in no definite amounts. Mixtures: Mixtures are made up of two or more substances mingled together but not chemically combined. Therefore mixtures can be made up of elements or compounds but in no definite amounts. Air is a mixture of gases in no definite amounts. Sea water is a mixture of water and salt. Dolly mix is a mixture of different colored and shaped sweets.

Differences between compounds and mixtures

To compare a mixture of iron and sulfur to the compound iron sulfide (FeS) Equipment: Mass balance,Spatula, Magnet, Test tube,Tongs, Bunsen burner, Pestel and mortar Chemicals : Iron filings, Sulfur

Method 1- using a pestel and mortor, grind up a mixture containing 6g of iron and 4g of sulfur. 2- wrap a magnet in paper and bring the magnet close to the mixture 3- remix the iron and sulfur,using a spatula, and place the mixture in a test tube. 4-Heat the test tube until the mixture glows red ( do this in a fume cupboard) 5-continue heating gently until the mixture stops glowing 6-Allow the test tube to cool and examine its contents. Remove the grey solid formed from the test tube 7- Bring a magnet close to the grey solid What do you notice? 1- using a pestel and mortor, grind up a mixture containing 6g of iron and 4g of sulfur. 2- wrap a magnet in paper and bring the magnet close to the mixture 3- remix the iron and sulfur,using a spatula, and place the mixture in a test tube. 4-Heat the test tube until the mixture glows red ( do this in a fume cupboard) 5-continue heating gently until the mixture stops glowing 6-Allow the test tube to cool and examine its contents. Remove the grey solid formed from the test tube 7- Bring a magnet close to the grey solid What do you notice?

Result: A new substance has been formed. It is called Iron Sulfide. It cannot be separated with the use of a magnet. Conclusion : When elements chemically combine to form compounds they loose their individual properties. IronSulfur Heat Iron Sulfide

Properties of compounds: Compounds are made of different elements chemically combines. The properties of compounds are very often completely different from those of the elements from which they are made.