Week 5 Class 10
Lesson 3 – Chemistry continued. . . Review – Matter is anything that has mass and occupies space. Matter is everything around you. Matter can be a pure substance (elements/compounds) or a mixture (homogeneous/heterogeneous). Atoms and molecules are all composed of matter. Try assignment 17. A pure substance is a type of matter which exists in its most basic or purest form and cannot be broken down further. Examples of pure substances include water, gases like carbon dioxide, oxygen and metals like platinum, gold and silver. Mixture is a combination of two or more pure substances where each substance keeps its own identity upon mixing. Mixtures are present almost everywhere on Earth. Look at rocks, the ocean, rivers or even the atmosphere. All of them are mixtures! In other words, anything that you can mix together is a mixture. Even the foods you eat. Do assignment 18.