Научный журнал
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- Бұл бет үшін навигация:
- Experiment 2
- «Chemical properties of metals»
| Experiment 1 Thermal conductivity of metals.
Metallic spoons made of silver, iron, aluminum and a zirconium tube the teacher puts in a glass with boiling water and gives one of the students to check which metal object became the hottest. Students conclude. Experiment 2 Light-melting properties of some metals. The teacher takes a sample of gallium in his hand, one of the students suggests taking zirconium into the palm of your hand. While metals heat up, the teacher recalls where these elements are located in the periodic table of DI Mendeleev, draws students’ attention to the electronic configurations of the valence electrons of their atoms: 31 Ga 4s24p1 40 Zr 4d25s2 Then the students complete the task 3. Task 3 Make formulas for the oxides of gallium and zirconium. After that, the teacher gives interesting information about these metals and their compounds, demonstrating in the course of the story jewelry - rings with zircon and cubic zirconium. Then the students recall the chemical properties of metals. «Chemical properties of metals» Metals interact: – with non-metals → binary compounds; – with water. Alkali and alkaline earth metals → alkali + hydrogen; some active metals (up to hydrogen) with heating → metal oxide + hydrogen; – with solutions of acids (except nitric): Metals to hydrogen → salt + hydrogen; – with salt solutions – metals are displaced from the salt solution only metals after magnesium; – with solutions of alkalis – transition metals → salt + hydrogen Task 4 Write the equations of reactions that occur when demonstrating experiments: 1 sodium + water →? 2 silver + water →? 3 zinc + solution of copper (II) sulfate →? 4 silver + solution of copper (II) chloride →? 5 Aluminum + sodium carbonate solution →? Before demonstrating each of the following experiments, the teacher sets the students’ problems. – Is it possible to dissolve copper sulfate in a galvanized bucket? 26 27 Вестник ПГУ, ISSN 1811-1831 Серия Педагогическая № 1. 2018 ПМУ Хабаршысы, ISSN 1811-1831 Педагогикалық сериясы № 1. 2018 – Will silver dissolve in a solution of copper (II) chloride? – Is it possible to boil a solution of soda in an aluminum saucepan? жүктеу/скачать 3.75 Mb. Достарыңызбен бөлісу:
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