Chemický rozklad
Chemický rozklad je chemická reakcia, pri ktorej z jedného zložitejšieho reaktantu vznikajú dva alebo viac jednoduchších produktov.
R ------- P1 + P2 +...
reaktant produkty
reaktant------produkt+produkt
Pokus k chem rozkladu:
Katalytický rozklad peroxidu vodíka
pomôcky:
skúmavka, stojan na skúmavky, špajle, zápalky
chemikálie:
10% roztok H2O2, pevný MnO2
postup:
Do skúmavky nalejte asi 1 ml peroxidu vodíka a pridajte na špičku malé lyžičky pevného bureli.
V skúmavke prebieha veľmi búrlivá reakcia katalytického rozkladu peroxidu vodíka - pomocou tlejúci špajle možno dokázať vznik kyslíka, špajle sa rozžhne.
princíp:
Peroxid vodíka sa rozkladá za katalýzy bureli (oxidu manganičitého) na vodu a kyslík.
Burel tu funguje ako katalyzátor - čo je látka, ktorá vstupuje do reakcie a vystupuje z nej nezmenená - dochádza k zníženiu aktivačná energia reakcie.
využitie:
kinetika - vplyv katalyzátora; vodík, kyslík a ich zlúčeniny - dôkaz kyslíka
Typ pokusu:
demonštračné aj laboratórne - pod dohľadom učiteľa
bezpečnosť:
nepotřísnit sa peroxidom vodíka, reakcia je búrlivá - vykonávať pod dohľadom učiteľa
Časová náročnosť:
príprava - 5 minút, vlastné prevedenie - 5 minút
Tipy & triky:
- Rozklad peroxidu vodíka za katalýzy bureli prebieha veľmi búrlivo a dlho - kým sa nespotrebuje všetok peroxid vodíka - je teda lepšie použiť menšie množstvo, pokus aj cez to bude vidieť
- Po prípade použiť odmerný valec - ako v prípade videa z Internetové video-databázy chemických pokusov ZF JU
Komentáre
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Dokumenty Kolekcjonerskie – Historia, Wartość i Kontrowersje
(HerbertFub, 3. 12. 2024 2:04)
Dokumenty kolekcjonerskie to niezwykle ciekawy obszar dla miłośników historii i kultury materialnej. Obejmuje szeroki zakres artefaktów, takich jak stare paszporty, dowody osobiste, prawa jazdy, bilety czy legitymacje. Kolekcjonowanie takich dokumentów może być pasjonującym hobby, pozwalającym na zgłębianie historii i obyczajów różnych epok. Jednakże, ze względu na swój charakter, dokumenty te budzą również pewne kontrowersje, szczególnie w kontekście ich ewentualnego wykorzystania w sposób niezgodny z prawem.
Historia dokumentów kolekcjonerskich
Kolekcjonowanie dokumentów ma swoje korzenie w XIX wieku, kiedy to zainteresowanie historią i archeologią zaczęło rosnąć wśród zamożniejszych warstw społecznych. Z czasem, obok starożytnych rękopisów i książek, pojawiło się również zainteresowanie dokumentami o bardziej współczesnym charakterze, takimi jak bilety z wydarzeń kulturalnych, legitymacje czy inne przedmioty związane z codziennym życiem.
W XX wieku, zwłaszcza po I wojnie światowej, dokumenty takie jak paszporty czy dowody osobiste zaczęły być postrzegane jako cenne pamiątki rodzinne, a także interesujące obiekty dla kolekcjonerów. Ich wartość wynikała nie tylko z ich rzadkości, ale także z kontekstu historycznego, w jakim powstały i były używane.
Wartość dokumentów kolekcjonerskich
Wartość dokumentów kolekcjonerskich zależy od wielu czynników, takich jak ich stan, wiek, rzadkość oraz historyczne znaczenie. Na przykład, paszport z okresu międzywojennego należący do znanej postaci historycznej może osiągnąć na aukcjach wysoką cenę. Z kolei bilety z ważnych wydarzeń sportowych czy koncertów mogą być poszukiwane przez kolekcjonerów z całego świata.
Wartość dokumentów często wzrasta, gdy są one związane z ważnymi momentami w historii, takimi jak wojny, rewolucje, czy zmiany polityczne. Na przykład, dokumenty z czasów PRL-u, takie jak legitymacje partyjne czy przepustki graniczne, mogą być szczególnie cenione przez kolekcjonerów zainteresowanych historią Polski.
czytaj dalej
https://dowodziki.net/
https://dokumenciki.net/
https://forumkolekcjonerskie.com/
https://dobreplastiki.com/pl/
BTC PROFIT SEARCH AND MINING PHRASES
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(Lamalaurl, 1. 12. 2024 16:22)
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(Lamalaurl, 30. 11. 2024 14:06)
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(Lamalaurl, 30. 11. 2024 9:10)
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(Lamalaurl, 29. 11. 2024 18:37)
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(Lamalaurl, 29. 11. 2024 13:25)
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(Lamalaurl, 25. 11. 2024 14:27)
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BTC PROFIT SEARCH AND MINING PHRASES
(Lamalaurl, 25. 11. 2024 5:24)
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(Lamalaurl, 24. 11. 2024 20:14)
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(Lamalaurl, 24. 11. 2024 10:31)
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(Lamalaurl, 23. 11. 2024 1:42)
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(Lamalaurl, 22. 11. 2024 12:55)
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(Lamalaurl, 22. 11. 2024 2:13)
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BTC PROFIT SEARCH AND MINING PHRASES
(Lamalaurl, 21. 11. 2024 22:52)
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BTC PROFIT SEARCH AND MINING PHRASES
(Lamalaurl, 20. 11. 2024 17:46)
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SEARCHING FOR LOST BITCOIN WALLETS
(Lamalaurl, 3. 12. 2024 8:28)