单质和化合物-Elements-and-Compounds课件

1、Elements and CompoundsElements and CompoundsObjectives Distinguish between elements单质 and compounds化合物. Describe the organization of elements in the periodic table元素周期表. Explain the laws of definite定比定律 and multiple proportions 倍比定律element: 单质, 元素Objectiveselement: 单质, 元素 Choose the mixture as homog

2、eneous. a. brass (an alloy of zinc and copper) b. muddy water c. blood d. powdered drink mix dissolved in waterExercises: Choose the mixture as homogenClassification:?solutionClassification:?solutionCan you see individual hydrogen and oxygen in the water?What is element and compound?Can you see indi

3、vidual hydrogeUrBr2CuUrBr2CuAn element is a pure substance that cannot be separated into simpler substances by physical or chemical means.Element单质Group discussion: Can you give some elements as many as you can? (In English)An element is a pure substanceCuHgHe/consisting of a single type ofatom CuHg

4、He/consisting of a single Periodic TableWho was the first to invent the modern periodic table?MendeleevPeriodic TableWho was the firsbased on the similarities and masses of the elementsperiod 周期group族based on the similarities and Compound 化合物Whats the similarities between water and carbon dioxide CO

5、2?Consist of two kinds of elementsPure substance, consist of oxygenmade up of two or more different elements that are combined chemicallyCompound 化合物Whats the similarHow can you prove salt is made up of two elements? Can you taste 3 things?NaCl2How can you prove salt is madeHow can you prove water i

6、s made up of two elements? The experiment?An electric current breaks down water into its components, oxygen and hydrogen. electrolysis 电解How can you prove water is madSummarize:Summarize:Classify the following matters into （mixture、pure substance、element、compound）：Classify the following mattersChoos

7、e the compounds from following substances ( ) table salt, water, alcohol, sucrose, sulfuric acid, baking soda，carbon dioxide, oxygen, helium食盐酒精蔗糖Choose the compounds from foll单质和化合物-Elements-and-Compounds课件 Law of conservation of massMass is neither created nor destroyed during a chemical reactioni

8、t is conserved保存的质量守恒定律Whats the change of iron? If the mass of reactants equal products? Law of conservation of massMa mass reactants = mass products A 13.0-g sample of X combines with a 34.0-g sample of Y to form the compound XY2. What is the mass of the reactants?Lets try: 反应物生成物P 9: 50 mass reactants = mass prod2. If 14.0g of N2 gas reacts with excess of hydrogen gas, Whats the mass of NH3 formed?2. If 14.0g of N2 gas reacts wHistory:Antoine Lavoisiermercury (II) oxideHistory:Antoine Lavoisierme