2.1-Characteristics of Matter.pptx

CHARACTERIS TICS OF MATTER CLASSIFICATION, AND PHYSICAL CHEMICAL PROPERTIES OF MATTER CHANGES OF MATTER 1  Learning Objective Classify matter and distinguish between physical and chemical 2  Classification of Chemistry Matter...

CHARACTERIS TICS OF MATTER CLASSIFICATION, AND PHYSICAL CHEMICAL PROPERTIES OF MATTER CHANGES OF MATTER 1  Learning Objective Classify matter and distinguish between physical and chemical 2  Classification of Chemistry Matter is the study of matter and the changes it undergoes. Matter is anything that occupies space and has mass. Atoms the almost infinitely small building blocks of matter. Molecules 3 two or more atoms  Classification of Matter 1.According to composition Substance Has definite composition and distinct properties ⮚ Elements ⮚ Compounds 4  Classification of ⮚ ElementsMatter ✔ Unique kind of atom ✔ Cannot be decomposed into simpler substance Aluminu m ⮚ Compound ✔ Composed of two or more elements Aluminum oxide 5  Classification of Mixture Matter ⮚ Combination of two or more substances in which each substance retains its chemical identity ⮚ Substances making up a mixture is called components ⮚ Heterogeneous – different composition, properties and appearance throughout ⮚ Homogeneous – uniform throughout 6  Classification of Matter 7  Classification of Matter 2. According to state Gas No fixed volume or shape. Liquid Distinct volume independent of its container but no specific shape. Solid Definite shape or volume. 8  Physical Property of Matter Physical Property Observed without changing the identity and composition of the substance Intensive does not depend on the amount of substance present Extensive depends on the amount of substance present 9  Chemical Property of Matter Chemical Property Describe the way a substance may change or react, to form other substance Heat of combustion - energy released during combustion, ΔHc Chemical Stability - whether a compoundwill react with water or air Flammability - whether a compoundwill burn when exposed to flame 10  Changes of Matter Chemical (Chemical reaction) A substance is transformed into a chemically different substance A chemical equation uses chemical symbols to show what happens during a chemical reaction. A chemical equation is a shorthand method of representing chemical reaction using chemical symbols and formulas to indicate the reactants and the products. 11  Changes of Matter Reactants are the starting materials in a chemical reaction and product is the substance formed as a result of a chemical reaction. In a chemical equation, the reactants are conventionally written on the left and the products on the right of the arrow. To provide additional information, chemists often indicate the physical states of the reactants and products by using the letters g for gas, l for liquid, s for solid, and aq for aqueous. KBr(aq) + KNO3(aq) + AgNO3(aq) AgBr(s) 12 reactants products