Metastable chemical systems and energy of activation

Продукт No: P1136400
Principle

This experiment shows that exothermic reactions start not always spontaneous when two (or more) substances are mixed together. Students realize that no reaction occurs when the reactants (in solid state) are mixed together. The solids usually begin to react with each other after addition of (thermal) energy (= activation energy). Mixtures of such reactants are so called "metastable systems". By supplying activation energy to a mixture in a metastable state the reaction mixture  reaches an "unstable" (activated) state, which starts the reaction.




Перечень материалов (вы́писка) Продукт Количество
Precision Balance, Sartorius ENTRIS623-1S, 620 g / 0.001 g 49294-99 1
Steel cylinder oxygen, 2 l, filled 41778-00 1
Support base DEMO 02007-55 1
Combustion tube, 300 mm, quartz, ns 33948-01 1
Reducing valve f.oxygen 33482-00 1
Table stand for 2 l steel cylinders 41774-00 1
Retort stand, h = 750 mm 37694-00 1
Teclu burner, DIN, natural gas 32171-05 1
Protective desk plate 40 x 40 cm 39180-10 1
Quartz glass wool 10 g 31773-03 1
Iron powder xtra pure 1000 g 30068-70 1
Connecting tube IGJ 19/26-GL 18/8 35678-01 2
Sulphur, purified, tech.gr.,1000g 30216-70 1
Teflon sleeve IGJ 19, 10 pcs 43616-00 1
Glass tube,right-angled, 10 pcs. 36701-52 1
Mortar with pestle, 150 ml, porcelain 32604-00 1
Wrench for steel cylinders 40322-00 1
Support rod, stainless steel, l = 600 mm, d = 10 mm 02037-00 2
Universal clamp 37715-00 2
Test tube, 160 x 16 mm, 100 pcs 37656-10 1
Safety gas tubing, DVGW, sold by metre 39281-10 1
Tweezers,straight,blunt, 200 mm 40955-00 1
Right angle boss-head clamp 37697-00 2
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs. 45019-25 1
Clamp f.ground joint,plastic,NS19 43614-00 2
Iron rods, flexible, 5 off 45127-00 1
Lighter f.natural/liquified gases 38874-00 1
Spoon, special steel 33398-00 1
Rubber tubing, i.d. 6 mm 39282-00 1
Hose clip f.12-20 diameter tube 40995-00 2

Литература по данной статье

Название Продукт Язык
Handbuch Lehrerversuche Allgemeine und anorganische Chemie, DEMO advanced Chemie (CT) 01850-01 DEU

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Продукт No: P1136400

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