WHAT IS IN A MIXTURE? Year 7 Science MATTER FLOWCHART PURE SUBSTANCES • Compounds such as water are pure substances • A compound is made up of two ore more different elements • Think back to what water is made up of • This means that they are made up of only that ONE type of compound MIXTURES • Mixtures are made up of two or more different elements and/or compounds. • When water and salt are mixed together • There are two types of mixtures: • Homogenous • Heterogeneous Using the diagram to the right, explain the difference between the two types of mixtures. Use the starting sentence below. In heterogeneous mixtures, the particles are…. TYPES OF MIXTURES EXAMPLES OF MIXTURE TYPES Homogeneous mixtures Homogenised milk Heterogeneous mixtures Sand in water CHEMICAL AND PHYSICAL CHANGES • What are chemical and physical changes? • A chemical change involves a chemical reaction where a new substance is formed. Eg iron rusting • A physical change doesn’t involve the formation of a new substance but just changes the way the substance is arranged eg. ice melting DIFFERENCES BETWEEN MIXTURES AND COMPOUNDS • https://www.brainpop.com/science/matterandchemistry/compoundsandmi xtures/ • Watch the Brainpop video and complete the worksheet based on scientific vocabulary related to mixtures and compounds.