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You know the "weather vane"? It is a figurine that indicates changes in humidity. This figurine is impregnated with a solution of cobalt salt in chemical equilibrium. When the humidity is high (wet weather), the cobalt salt is pink. When the humidity is low (dry weather), the cobalt salt changes the color to blue. It is an example of a reversible reaction. A reversible reaction is usually represented by double arrows ( Let us assume that the direct reaction is one that occurs in the formation of the product (one that the arrow points to the product, reagent direct product). The reaction occurs in the reverse considered regenerating the reagent (that which the arrow points to the reagent reagent inverse product). In this sense, the experiment above, we have: iodine + starch direct complex iodine-starch (blue). reverse Do you remember what it means speed of a chemical reaction? Does it has to do with the time it takes for a reaction is complete? An effervescent tablet dissolves faster in cold water or hot water? Remember that the speed of a chemical reaction is related to the rapidity with which the reaction occurs. Now, consider the reaction between carbon dioxide (CO ) and water that occurs inside your body (closed system). Remember: aq = aqueous (water), g = gas, s = solid, l = liquid direct CO The Reverse CO This reaction is reversible, since at any given time of the reaction product carbonic acid (H CO ) decomposes into carbon dioxide and water. Note the outline of the reaction that occurs at constant temperature.
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Vi znate "vjetrokaz"? To je figura koja ukazuje na promjene u vlažnosti. Ova figura je impregniran s otopinom soli kobalta u kemijskoj ravnoteži. Kad je vlažnost velika (mokro vrijeme), kobalta sol je ružičasta. Kada je vlažnost zraka niska (suho vrijeme), kobalta soli mijenja boju u plavu. To je primjer reverzibilne reakcije. Reverzibilne reakcije obično zastupa bračnih strelicama ( Pretpostavimo da izravna reakcija koja se javlja u formiranju proizvoda (onaj koji strelica pokazuje na proizvodu, reagensa izravnog proizvoda). Reakcija se događa u obrnutom smatra regenerira reagensa (što strelica pokazuje na reagensa reagensa obrnutom proizvoda). U tom smislu, eksperiment gore, imamo: jod + škroba izravna kompleksu joda-škroba (plava). preokrenuti Sjećaš li se što to znači brzinu kemijske reakcije? Da li to ima veze s vrijeme koje je potrebno za reakciju završi? Šumeća tableta rastapa brže u hladnoj vodi ili tople vode? zaboravite da je brzina kemijske reakcije odnosi se na brzinu kojom reakcije. Sada, razmislite reakciju između ugljičnog dioksida (CO ) i vode koja se događa unutar vašeg tijela (zatvoreni sustav). Zapamtite: aq = vodena (voda), g = plinom, s = čvrsta, l = tekuća usmjeriti CO Reverse CO Ova reakcija je reverzibilna, jer u bilo kojem trenutku reakcije proizvoda ugljične kiseline (H CO ) razgrađuje u ugljični dioksid i vodu. Napomena obris reakcija koja se javlja kod konstantne temperature.