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.
| ΠΠ΅ΡΠ΅ΡΠ΅Π½Ρ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² (Π²ΡΜΠΏΠΈΡΠΊΠ°) |
ΠΡΠΎΠ΄ΡΠΊΡ |
ΠΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ |
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Precision Balance, Sartorius ENTRIS623-1S, 620 g / 0.001 g
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49294-99
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1
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Steel cylinder oxygen, 2 l, filled
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41778-00
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1
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Support base DEMO
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02007-55
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1
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Combustion tube, 300 mm, quartz, ns
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33948-01
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1
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Reducing valve f.oxygen
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33482-00
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1
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Table stand for 2 l steel cylinders
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41774-00
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1
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Retort stand, h = 750 mm
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37694-00
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1
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Teclu burner, DIN, natural gas
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32171-05
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1
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Protective desk plate 40 x 40 cm
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39180-10
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1
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Quartz glass wool 10 g
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31773-03
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1
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Iron powder xtra pure 1000 g
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30068-70
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1
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Connecting tube IGJ 19/26-GL 18/8
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35678-01
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2
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Sulphur, purified, tech.gr.,1000g
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30216-70
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1
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Teflon sleeve IGJ 19, 10 pcs
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43616-00
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1
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Glass tube,right-angled, 10 pcs.
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36701-52
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1
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Mortar with pestle, 150 ml, porcelain
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32604-00
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1
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Wrench for steel cylinders
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40322-00
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1
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Support rod, stainless steel, l = 600 mm, d = 10 mm
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02037-00
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2
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Universal clamp
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37715-00
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2
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Test tube, 160 x 16 mm, 100 pcs
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37656-10
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1
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Safety gas tubing, DVGW, sold by metre
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39281-10
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1
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Tweezers,straight,blunt, 200 mm
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40955-00
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1
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Right angle boss-head clamp
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37697-00
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2
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Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs.
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45019-25
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1
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Clamp f.ground joint,plastic,NS19
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43614-00
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2
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Iron rods, flexible, 5 off
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45127-00
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1
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Lighter f.natural/liquified gases
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38874-00
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1
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Spoon, special steel
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33398-00
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1
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Rubber tubing, i.d. 6 mm
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39282-00
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1
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Hose clip f.12-20 diameter tube
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40995-00
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2
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