Presentation on theme: "What are compounds? Learning objectives:"— Presentation transcript:
1 What are compounds? Learning objectives: Explain what is meant by compoundsRecognise how compounds formUnderstand how elements form compoundsStarter:Make two lists1 Mixtures2 ElementsFill in as many mixtures and elements you know
2 Can you describe what a compound is? What is an element??What is a mixture?Can you describe what a compound is?
3 Atoms in elements and compounds Elements are materials made up of one type of atom only.The element, hydrogen, exists as molecules.Each hydrogen molecule is made up of two hydrogen atoms joined together.HCompounds contain two or more different types of atom.The compound, water, exists as molecules.Each water molecule consists of two hydrogen atoms joined to one oxygen atom.
4 Properties of a compound – carbon dioxide A compound has different properties to the elements from which it is made because the atoms are joined differently.carbonoxygencarbon dioxide+Black solid used as fuel.Colourless gas in which many substances burn.Colourless gas used in fizzy drinks and fire extinguishers.++OC
5 A compound is not a mixture The atoms in a mixture of hydrogen gas and oxygengas, which have not reactedwith each other, look like this…The atoms in water, the compound made when hydrogen and oxygen react and their atoms become chemically joined to each other, look like this…
6 Making compounds by heating mixtures Practical:Making compounds by heating mixturesWatch the demo carefully- think of the safety points
8 Element 1 Iron Magnesium Copper Element 2 Oxygen ________ Sulphur We can make compounds from elementsThe name of the compound can tell us what elements have combinedElement 1IronMagnesiumCopperElement 2Oxygen________SulphurCompoundIron OxideMagnesium OxideCopper Sulp______
9 Method: Light a Bunsen burner and use a blue flame. Using a metal spatula drop a few drops of iron into the top of the flame.Using tongs, burmn1cm piece of magnesium in the flame. Safety: do not look directly at the burning magnesium.Complete the table.NumberName of compoundAny changes you saw1Iron oxide2Magnesium oxide
10 Word splat Write down any keyword from the topic Write a question that the key word is the answerWord splat