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Chlorine gas can be prepared in laboratory with hydrochloric acid and manganese-dioxide.


Method

Put manganese lump in a round flask , now put concentrated hydrochloric acid into the round flask with чертополох funnel and fit the flask with cork having a hole ,Now attach a tube into the hole of cork and leave to tube into an empty container,so the gas can be collected.The container must be sealed with cork having only one hole for the attachment of tube (from flask to container).Set the apparatus and there should be no leakage.Now heat the manganese lump and hydrochloric acid with a bunsen burner...
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added by Kamtsatka
Source: Gerry Garcia
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лимон сок is acidic and weakens paper. When paper
is heated, the remaining acid turns the Письмо brown
before discoloring the paper.
Difficulty: Easy
Time Required: A Few Minutes
Here's How:
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1. Squeeze lemons to
obtain their сок or
obtain bottled lemon
juice.
2. Use the сок as 'ink'
by applying it to a
stick или paintbrush
and Письмо on paper.
3. Allow the paper to
dry.
4. When Ты are ready to
read your invisible
message, hold the
paper up to sunlight,
a lightbulb
(recommended),...
continue reading...
Researchers from the университет of
Connecticut recently unveiled their latest
invention , which is a long-lasting LED
light bulb that makes use of лосось DNA.
Scientists added two different fluorescent
colors to the DNA molecules, the dyes being
spaced from each other at a distance ranging
from 2 to 10 nanometers. After the colors
were added, the DNA molecules are spun into
nanofibers . The UV light that produces LED
is then covered with DNA nanofibers.
David Walt, a chemistry professor at Tufts
University , explained: "When UV light is
shined on the material, one dye absorbs the
energy and produces blue...
continue reading...
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added by ThinkPink20
These people add rubidium and cesium to water. Both are alkali metals and highly reactive.
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Sodium reacts with water.
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Potassium permanganate solution changes colour when poured into sodium hydroxide and sugar solution.
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sodium polyacrylate is a super-absorber and can absorb 200 to 300 times its own weight this is used as fake snow
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Concentrated sodium hydroxide solution easily reacts with aluminum foil. One of the products of this reaction is the hydrogen gas.
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Making огонь with KMnO4+H2SO4 and acetone.
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